CN106997058B - A kind of scintillator performance testing device and its Concordance method - Google Patents
A kind of scintillator performance testing device and its Concordance method Download PDFInfo
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- CN106997058B CN106997058B CN201610044913.2A CN201610044913A CN106997058B CN 106997058 B CN106997058 B CN 106997058B CN 201610044913 A CN201610044913 A CN 201610044913A CN 106997058 B CN106997058 B CN 106997058B
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- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/005—Details of radiation-measuring instruments calibration techniques
Abstract
The invention discloses a kind of scintillator performance testing device and its Concordance methods.The present apparatus includes detector array, temperature compensation system, preamplifier, multi-channel data acquisition plate and the testing cassete for placing scintillator to be measured；Wherein the scintillator placement location in testing cassete is corresponding with light-detecting device each in detector array；Preamplifier amplifies forming, difference output per signal all the way for export detector array；Multi-channel data acquisition plate is used to carry out analog-to-digital conversion to received multichannel differential analog signal, to the real-time peak-seeking of every railway digital signal and completes every railway digital signal integration later；The integration data of every road signal is finally transmitted to computer data acquisition system；And temperature-compensating correction, light output calibration of the output results and energy resolution are carried out by ad hoc approach to the obtained power spectrum of each photo detecting unit and corrected.The present apparatus more scintillators of independent test and can not interfere with each other simultaneously, improve measurement result precision.
Description
Technical field
The invention belongs to nuclear radiation detector technical field, it is related to a kind of scintillator performance testing device and its consistency school
Correction method.
Background technique
Particle or radiation in high-energy physics field can not be observed directly, only by being converted into matter interaction
Optical signal or electric signal known to the mankind could be by indirect detections.Nuclear radiation detector is exactly that high energy grain is detected using the principle
The device of son or nuclear radiation event, has been widely used in nuclear physics experiment, nuclear safety, nuclear medicine, geology detecting and work at present
The fields such as industry flaw detection.As one of most widely used nuclear radiation detector, scintillator detector is generally by scintillator, optical detection
Device and electronics composition；It generates the principle of fluorescence using scintillator and radiating particle interaction, and fluorescence is inputted
Photoelectric conversion and signal amplification are carried out to light-detecting device, handles to obtain radiation example finally by electronics is carried out to electric signal
Information.Therefore when developing scintillator detector, the scintillator for measuring, filtering out light output function admirable is to guarantee that scintillator is visited
Survey the first step of device working performance.At certain application fields (such as nuclear medical imaging apparatus), often an equipment needs on thousands of
Ten thousand scintillators, therefore the performance test of scintillator becomes a heavy task.
About the performance test of scintillator, technical solution both domestic and external focuses primarily upon certain property for measuring certain scintillator
Energy, such as the absolute light output with single photoelectron method measurement scintillator；This kind of technical solution measurement result is reliable, measurement method is smart
It is close, but measurement procedure is cumbersome, structure is complicated for measuring device；Not only use environment is limited, but also measurement efficiency is low, it is difficult to
The measurement work of competent high-volume scintillator performance.A kind of scintillator is disclosed in national inventing patent CN102353976A
Be capable of measuring device, can single complete the measurements of a large amount of scintillator performances.But light-detecting device involved in the patent can be by
To certain environmental factors (such as temperature, voltage) influence and cause the unstability of scintillator performance measurements；Single simultaneously
When measuring a large amount of scintillators, since the scintillation light of a scintillator is detected by multiple photo detecting units, then by multiple light
The signal of probe unit, which sums up, obtains the signal amplitude corresponding to this scintillator light output, and has part full energy peak
Signal be gamma photons occur Compton scattering after, the sedimentary energy institute shape in two or more different scintillator
At, so, the power spectrum corresponding to a scintillator is because by the inconsistency of photo detecting unit gain and in different sudden strains of a muscle
The influence of the Compton scattering occurred in bright body, the precision of full energy peak peak position will be restricted, under normal circumstances, about ±
5%, it also can only achieve ± 3% under best conditions, in addition, due to the gain inconsistency of each photo detecting unit and Compton
The full energy peak energy resolution of the influence of scattering, surveyed scintillator power spectrum is also inaccurate, can not really reflect this scintillator to certain
The energy resolution of a energy gamma rays, so there is no integrated energy resolutions for device disclosed in patent CN102353976A
Rate tests this functional module.
Summary of the invention
For device disclosed in patent of invention CN102353976A, it is an object of the invention to mention
For a kind of scintillator performance testing device that performance is stable and its Concordance method.This device for measuring performance of scintillator uses
Basic light-detecting device flexible design detector array is independently read out, handles the defeated of discrete light-detecting device in detector array
Signal out is capable of the scintillator of more plurality of specifications of independent test simultaneously, and not in conjunction with the flexible Application of scintillator testing cassete
Light cross talk effects can provide the accurate light output measurement result of scintillator and energy resolution measurement result, test result
It is more accurate；The introducing of technique for temperature compensation influences this measuring device working performance by variation of ambient temperature, test knot
Fruit is more stable；By carrying out Concordance to detector array, realizes each measuring unit in detector array and exist
Uniformity in light output measurement result and energy resolution measurement result；Using low-voltage regulated power supply system, reduce power supply
Ripple, this measuring device is not only by the interference of alternating current shakiness, while safe operation is simple, switching on and shutting down are convenient and efficient, mentions significantly
Scintillator testing efficiency is risen.
Technical solution:
This device for measuring performance of scintillator include mechanical cabinet, power-supply system, M*N detector array, preamplifier,
M*N channel data analog input card, temperature monitoring system and scintillator testing cassete.Wherein:
Mechanical cabinet is for loading each component；
Power-supply system mainly includes two adjustable stabilized voltage supplies, is connected with each component, switch and powers to each component；
M*N detector array is slapped together by M*N light-detecting device according to certain interval, for independent measurement simultaneously
M*N root scintillator to be measured obtains the energy information of each scintillator to be measured；
It is defeated that the road the M*N independent signal that preamplifier exports M*N detector array carries out independently amplification forming, difference
Out to M*N channel data analog input card；
The road the M*N differential analog signal of M*N channel data analog input card receiving front-end electronic system output simultaneously carries out mould
Number conversion, to the real-time peak-seeking of every railway digital signal and completes every railway digital signal integration later.Finally by the product of every road signal
Divided data is transmitted to computer data acquisition system；Data collecting plate card is completed the temperature acquisition function of detector and is transmitted simultaneously
Temperature signal is to computer data acquisition system；
Temperature monitoring system is gone forward side by side trip temperature compensation correction for monitoring variation of ambient temperature, and lifting measurement device is in shakiness
Determine the job stability in environment；
Scintillator testing cassete, with detector array intimate contact, makes flashing body position to be measured for loading scintillator to be measured
It is fixed；
Light output result Concordance and energy resolution consistency school are carried out to M*N measuring unit of measuring device
Just, the consistency between each measuring unit is realized.
Compared with prior art, beneficial effects of the present invention:
This measuring device independent test M*N root scintillator, the optical crosstalk avoided between tested scintillator can be interfered now simultaneously
As measurement result is more accurate；In the case where scintillator independent measurement and measuring two kinds of measuring states simultaneously with other scintillators, light is defeated
Measurement result difference is better than ± 0.5 better than ± 1.0%, energy resolution measurement result stability out, compares patent of invention
Device disclosed in CN102353976A, which has, significantly to be improved；
A photo detecting unit only detects the light of scintillator sending in this measuring device, what a scintillator issued
Light is also only detected by a photo detecting unit；Therefore the test full energy peak peak position precision of tested scintillator is only tested flashing with this
Body and its photo detecting unit are related, are not interfered by other photo detecting units；The test full energy peak peak position of the tested scintillator simultaneously
By gamma ray, through Compton scattering, the sedimentary energy in other scintillators is not influenced precision, because being tested scintillator pair with this
The photo detecting unit answered can only detect the scintillation light that scintillator sending is tested by this；So this measuring device is to the complete of scintillator
Energy peak peak position measuring accuracy is very high, is better than ± 1.0%, has substantially compared to device disclosed in patent of invention CN102353976A
Improvement.
This measuring device is carried out continuously scintillator performance measurement for a long time in the environment of temperature change, and measurement result is stablized
Property it is good, be better than ± 2%；
M*N measuring unit consistency is better than ± 1.0% in this measuring device, therefore when using this measuring device, only
Light output measurement need to be carried out to wherein some measuring unit demarcates the measurement result calibration that can be completed to entire measuring device；
This measuring device measures independent scintillator using independent photo detecting unit, therefore can also be to being surveyed
The energy resolution of power spectrum full energy peak carries out effective measurement and calibration, provides high-precision energy resolution for scintillator and surveys
Examination compares patent of invention in order to screen in terms of light output and energy resolution two to scintillator
Device disclosed in CN102353976A is a function enhancing.
The interference of the city this measuring device job stability Bu Shou electro-mechanical wave, at the same safe operation is simple, switching on and shutting down facilitate it is fast
Victory greatly improves scintillator testing efficiency.
Detailed description of the invention
Fig. 1 is that scintillator tests structure chart (for preventing optical crosstalk)；
Fig. 2 is that measuring device detector array and electronic system are laid out plane structure chart；
Fig. 3 is preamplifier layout structure figure；
Fig. 4 is single channel sensing technique schematic diagram；
Fig. 5 is scintillator performance testing device structural schematic diagram；Wherein, 1 --- mechanical box body；2 --- power-supply system；
3 --- cooling system；4 --- preamplifier；5 --- detector array；6 --- M*N channel data collection plate；7——
Scintillator testing cassete；9 --- scintillator takes out box；
Fig. 6 is scintillator testing tool structural schematic diagram；
(a) scintillator takes out box；(b) scintillator testing cassete.
Specific embodiment
It is assumed that above-mentioned M=N=8, it is assumed that above-mentioned light-detecting device is silicon photomultiplier (SiPM), is this measurement dress below
Set the specific implementation form of development:
Mechanical cabinet 1 loads whole components of device for measuring performance of scintillator, and serves and be protected from light.
Power-supply system 2 is divided to two power modules.Power module one is ultralow ripple adjustable stabilized voltage supply, is detector array
It powers with preamplifier；Power module two is low-ripple switch power supply, is that data collecting plate card and temperature monitoring system supply
Electricity.The present invention reduces the system noise of measuring device using low ripple power module, by the biggish data collecting card of noise jamming
It carries out independently-powered, it is intended to reduce the interference of measuring device internal system.After the completion of device debugging, for detector array power supply
Adjustable stabilized voltage supply is set as the non-adjustable state of user, and there is no need to re-scale measuring device because supply voltage changes.Electricity
High voltage power supply is not present in source system, ensure that the safety of whole system, therefore without spending in measuring device use process
More times are for going up and down high pressure.
Detector array 5 scrabbles up 8*8 detector array according to equidistant d by 64 silicon photomultipliers (SiPM).Battle array
Row detector surface pastes one layer very thin of high transparency material as optical protection layer.Scintillator to be measured is put into as shown in Fig. 6
After being protected from light a period of time in testing cassete 7 with hole slot 8, (as shown in Figure 1) tips upside down on testing cassete on detector array 5, flashing
Light is detected by the optics light transmitting sheet of testing cassete bottom by SiPM, testing cassete hole slot center and detector array 5SiPM
It is aligned one by one.Scintillator and light transmitting sheet pass through Air Coupling (the refractive index n of light transmitting sheetLight transmitting sheet=1.46, the refractive index of air is
nAir=1.0) refraction angle θ≤43.23 °, due to the refraction of light, after scintillation light enters light transmitting sheet from air, in light transmitting sheet.
Light is in thick h1Light transmitting sheet internal transmission when lateral divergence propagate length be d1=h1·tan(θ).Light transmitting sheet is testing cassete
A part, for loading scintillator and optical transport；Therefore from the point of view of mechanical strength, light transmitting sheet should not be too thin, and thickness needs
Meet h1≥1mm。
SiPM2 is the test cell of scintillator B2 in Fig. 1, under unglazed crosstalk condition, between scintillator B2 and SiPM2
Light output is one-to-one with optical detection.Therefore the spacing d between SiPM meets: d >=d1=h1When tan (θ) >=0.9mm,
SiPM2 will not detect the light of scintillator B1 and B3 sending.
Optical protection layer mainly plays a part of to protect detector array and light transmission, therefore the thickness h of protective film2It can be thin as far as possible
So that diverging of light during passing through protective film can be ignored.
By said structure design, optical crosstalk is eliminated during optical transport and detection: the light that scintillator B2 is issued
It is only detected by SiPM2, SiPM2 can only also detect the light of scintillator B2 sending.
At the same time, not only the detection of the optical transport of scintillator and SiPM is one-to-one, each SiPM survey of detector array
It measures unit and uses single channel sensing technique (as shown in Figure 4), avoid letter in the electronics processing of test signal and acquisition process
Number interference.
In Fig. 6, the hole slot size of scintillator testing cassete 7 is consistent with tested scintillator size, is mainly used for every light and prevents
Only optical crosstalk, the size for adjusting hole slot can satisfy the scintillator test of different size；And scintillator takes out the hole slot cross-section of box
Size is consistent with scintillator, and depth is less than the height of tested scintillator.After scintillator is completed, by testing cassete 7 and take out
Box 9, which is combined, to be spun upside down, and can easily take out tested scintillator under the premise of keeping test No. sequence.
After the completion of measuring device debugging, detector array supply voltage will be set as the unadjustable state of user, therefore
Measuring device factory calibration state can be kept for a long time, be not required to frequently demarcate measurement result.
Measuring device detector array and electronic system layout plane structure chart are as shown in Figure 2, wherein port 1 is used for
Signal transmission and position between detector array and pinboard are fixed；Port 2 is used between pinboard and signal-processing board
Signal transmission fixed with position；Port 3 passes through signal wire for the signal transmission between signal-processing board and data acquisition board
Connection；2 center of port on pinboard is with 3 center of port in data acquisition board in space layout
It is aligned one by one, this layout turns to play space transitional function in " 1 × 64 " road reception signal process in " 4 × 16 " road output signal；
As shown in figure 3, four block signal processing boards are respectively inserted at the port 2 of four different locations of pinboard, will make to be located at four pieces
The port 3 of signal-processing board is spatially aligned one by one with four ports 3 for being located at data acquisition board, so as to avoid due to letter
The excessive distortion and bring signal interference of signal wire number between processing board and data acquisition board.
Fig. 3 is preamplifier layout structure figure；Wherein, four block signal pinboard parallel alignments are inserted into, and are visited with array
4 × 16 mode signal output of device is surveyed to correspond；Four block signal processing boards are respectively inserted in the different port position of four pieces of pinboards
Place, it is parallel to be staggeredly laid out；The signal output port of signal-processing board by with the four of data acquisition board signal input ports in sky
Between be aligned on relative position one by one.
As shown in Fig. 2, independent amplification forming energy signal of 64 tunnels from detector array of preamplifier 4 and difference
Output is avoided in signal processing and is interfered with each other to data acquisition board 6.64 channel preamplifiers are by four 16 channels
Signal-processing board is constituted；8 × 8 detector array, 64 road energy signal is read in a manner of 4 × 16, and 64 channel data collection plates with
1 × 64 mode difference reads in signal；Interference is brought to signals transmission to avoid the overflexing of signal wire from distorting, by battle array
Row detector is connected with preamplifier by four block signal pinboards, and topology layout is as shown in Figures 2 and 3.Switching
The introducing of plate, realize between signal transmission port space linking, while make preamplifier 4 staggeredly be laid out, convenient for into
The heat dissipation of row electronic system.
64 channel data collection plates 6 receive the 64 road differential signals that preamplifier 4 exports and are digitized, and will count
Word signal is transmitted to computer data acquisition system；It receives simultaneously and transmits temperature information to computer data acquisition system.Most
Metrical information is arranged by computer data acquisition system eventually, is analyzed, generates measurement report.
Temperature-compensating correction, power spectrum Concordance, peak-seeking are carried out to measuring device in computer data acquisition system
Fitting, light output measurement result demarcate and carry out Concordance to energy resolution result.
Temperature monitoring system 3 is made of cooling system, temperature sensor and temperature compensation algorithm.Temperature monitoring system work
Principle is as follows: being carried out by cooling system (being made of air inlet and outlet, radiator fan) to measuring device electronic system scattered
Heat；The real-time working temperature of detector array is monitored by temperature sensor and temperature information is sent to data acquisition board, finally
It is received by computer data acquisition system；Observation metrical information variation with temperature relationship simultaneously does following temperature to measurement result accordingly
Spend compensation correction: ECorrect=EMeasure(1+fTΔ T) (wherein, ECorrect--- correct later metrical information；
EMeasure--- correct pervious metrical information；fT--- metrical information varies with temperature coefficient；Δ T --- temperature change).It examines
Consider the otherness and single channel sensing technique of 64 SiPM in detector array, the temperature varying coefficient of each measuring unit
It is not identical, therefore temperature-compensating correction is carried out respectively to 64 measuring units.After temperature-compensating corrects, measuring device pair
The measurement result of scintillator is not influenced by variation of ambient temperature and device internal electron system heat generation.
Light Difference between each measuring unit will lead to the light output measurement that same scintillator obtains in each measuring unit
As a result it has a certain difference.On the basis of completing temperature-compensating correction, light output measurement result one is carried out to measuring device
The correction of cause property.It is as follows in correction course: (each using each measuring unit of detector array in conjunction with radioactive source in dark situation
Measuring unit includes in a silicon photomultiplier and the preamplifier handled silicon photomultiplier acquisition signal
With the signal processing circuit in multi-channel data acquisition plate) measurement same root scintillator, record the measurement of each measuring unit
Peak position Pmeasure-i, measure peak position average valueIt is obtained by formula (1):
Concordance coefficient AiIt is obtained by formula (2):
The correction as shown in formula (3) is carried out to the measurement power spectrum of this measuring device accordingly:
EPOutPut-i=EPmeasure-i·Ai........................................(3)
Wherein, EPmeasure-i--- the gamma-spectrometric data before Concordance, EPOutPut-i--- the power spectrum after Concordance
Data.The Concordance as shown in formula (3) is carried out to each track data in each measuring unit power spectrum, not only meets peak
Consistency (the P of position measurement resultOutPut-i=Pmeasure-i·Ai), while keeping energy resolution measurement result unaffected.
After this correction, same root scintillator, peak position measurement result P are measured using any cellOutPut-iUnanimously, and
Light output measurement result (PhOutPut-i=gPOutPut-i) same consistent.
The energy resolution ER of scintillator detector by detector self-energy resolution ratio DERWith the intrinsic energy of scintillator
Measure resolution ratio SERTwo parts composition, i.e.,Therefore, energy resolution measurement of the scintillator in the present apparatus
As a result by the self-energy resolution ratio U of measuring unitERWith the self-energy resolution ratio S of scintillatorERTwo parts composition, i.e.,In detector array the difference of 64 SiPM and 64 be independently read out channel difference cause
Otherness of 64 measuring units in self-energy resolution ratio in measuring device, therefore same scintillator will be will lead in this dress
The energy resolution measurement result set at different location is inconsistent.For this problem, the present apparatus has carried out 64 measuring unit sheets
The Concordance for levying energy resolution, eliminates energy resolution measurement result institute band of the difference to scintillator of measuring unit
The influence come.Bearing calibration is as follows:
Under radiation source, same root scintillator is tested respectively with 64 measuring units, records corresponding energy resolution
Rate measured value ERmeasure-i(i=1,2 ..., 64), and ERmeasure-iMeet relational expression (4) while deriving relational expression (5) establishment.
So the self-energy differences in resolution available relationship formula (6) of 64 measuring units of this measuring device indicates:
Knot is measured to the energy resolution of same root scintillator to eliminate the self-energy differences in resolution of each measuring unit
It is influenced brought by fruit, output result is measured to energy resolution and carries out the correction as shown in relational expression (7):
After peak position Concordance and energy resolution result Concordance, detector array any cell is used
Same root scintillator is measured, peak position measurement result, light output measurement result and energy resolution measurement result are consistent.
There is no carry out Concordance to measuring device in known method, it is therefore desirable to each position of measuring device
Light output is demarcated, and the calibration coefficient of each position is inconsistent.And this measuring device completes temperature-compensating correction, consistency
On the basis of correction, need to only demarcate to a certain measuring unit of detector array can be completed to entire measuring device
Calibration.Calibration process is as follows: under the irradiation in certain power radiation source, the scintillator (standard scintillation body) of known light output being passed through
Test fixture is placed on detector array and measures, and obtains the all-round peak position road location P0 of the radioactive source；Tentative standard scintillator
Light output be 6000ph/MeV, under identical radiation source, the corresponding light output of measurement peak position road location Px is
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
It is all within spirit of that invention and principle, done any modification, equivalent substitution, improvement and etc. should be included in the scope of the present invention
Within.
Claims (10)
1. a kind of scintillator performance testing device, which is characterized in that including M*N detector array, temperature monitoring system, preceding storing
Big system, multi-channel data acquisition plate and the testing cassete for placing scintillator to be measured；Wherein:
M*N detector array includes M*N light-detecting device；
The light-detecting device in scintillator placement location and M*N detector array in testing cassete corresponds, for only simultaneously
The vertical most M*N root scintillators to be measured of measurement；
Preamplifier amplifies forming, difference output at most per signal all the way for export M*N detector array
Channel data collection plate；
Multi-channel data acquisition plate, it is real to every railway digital signal later for carrying out analog-to-digital conversion to the received differential signal of institute
When peak-seeking and complete every railway digital signal integration；The integration data of every road signal is finally transmitted to computer data acquiring system
System.
2. scintillator performance testing device as described in claim 1, which is characterized in that the surface of the M*N detector array
The optical protection layer of one layer of light transmission is pasted, a light transmitting sheet is equipped between the optical protection layer and the testing cassete, light transmitting sheet is high saturating
Light rate material is for loading scintillator and carrying out optical transport；Spacing d between light-detecting device meetsθ is that light is entered the refraction angle after light transmitting sheet, n by airAirFor air refraction
Rate, nLight transmitting sheetFor light transmitting sheet refractive index, h1For the thickness of light transmitting sheet.
3. scintillator performance testing device as described in claim 1, which is characterized in that the light-detecting device includes single channel
Photomultiplier tube, optical diode, avalanche-type optical diode, silicon photomultiplier.
4. scintillator performance testing device as claimed in claim 1 or 2, which is characterized in that if the preamplifier includes
Dry multi-passage signal processing plate；The M*N detector array passes through a pinboard instead of signal wire and a multi channel signals respectively
Processing board connection, each multi-passage signal processing plate are connect with data acquisition board by signal wire respectively.
5. scintillator performance testing device as claimed in claim 4, which is characterized in that parallel alignment between each pinboard, together
When pinboard on the output port that is interspersed multi-passage signal processing plate is staggeredly laid out in parallel, parallel staggeredly layout it is more
Output port in channel signal processing board is aligned one by one with the input port in data acquisition board.
6. scintillator performance testing device as described in claim 1, which is characterized in that including a temperature monitoring system, be used for
It monitors the real-time working temperature of each light-detecting device in M*N detector array and is sent to temperature information through data acquisition board
The computer data acquisition system, and formula E is pressed respectively to each light-detecting device in M*N detector arrayCorrect=
EMeasure(1+fTΔ T) carry out temperature-compensating correction；Wherein, ECorrectTo correct later metrical information；EMeasureFor correction
Pervious metrical information；fTCoefficient is varied with temperature for metrical information；Δ T is temperature change value.
7. scintillator performance testing device as claimed in claim 5, which is characterized in that the electricity of the scintillator performance testing device
Source system includes power module one and power module two；Wherein, power module one is ultralow ripple adjustable stabilized voltage supply, is M*N
Detector array and preamplifier power supply；Power module two be low-ripple switch power supply, be multi-channel data acquisition plate and
Temperature monitoring system power supply.
8. scintillator performance testing device as claimed in claim 1 or 2, which is characterized in that be equipped with M*N in the testing cassete
For being inserted into the hole slot of scintillator to be measured, the center of hole slot is corresponding with each light-detecting device in M*N detector array；Also
Box is taken out with the matched scintillator of the testing cassete including one；The scintillator, which takes out, is equipped with multiple hole slots, the section ruler of hole slot in box
Very little consistent with scintillator to be measured, depth is less than the height of scintillator to be measured.
9. a kind of energy resolution bearing calibration based on scintillator performance testing device described in claim 1, the steps include:
1) in dark situation, same root scintillator is measured using each measuring unit in conjunction with radioactive source, records corresponding energy point
Distinguish measured value ERmeasure-i；Wherein, each measuring unit include in M*N detector array a light-detecting device and with the light visit
Survey the signal processing circuit of device connection；
2) according to the energy resolution measured value ER of each measuring unitmeasure-iThe flat of an energy resolution measured value square is calculated
Mean value meets
3) when using any measuring unit i measurement same root scintillator, output result is measured according to formula to energy resolutionIt is corrected, exports energy resolution measurement result EROutPut-i；
Wherein,UER-iIt is single for measurement
The energy resolution influence value of first i, SERIt is differentiated for the self-energy of the scintillator；For each measuring unit energy resolution influence value
UER-iSquare average value.
10. a kind of light output calibration of the output results method based on scintillator performance testing device described in claim 1, the steps include:
1) in dark situation, same root scintillator is measured using each measuring unit in conjunction with radioactive source, records corresponding full energy peak
Position measurement result Pmeasure-i；Wherein, each measuring unit include in M*N detector array a light-detecting device and with the light
The signal processing circuit of sensitive detection parts connection；
2) according to the full energy peak measured value P of each measuring unitmeasure-iFull energy peak measurement average value is calculatedWherein, K=M*N；
3) when using any measuring unit i measurement same root scintillator, every one of measurement data root all can be composed to measuring unit i
According to formula EPOutPut-i=EPmeasure-i·AiIt is corrected, then full energy peak measurement result is POutPut-i=Pmeasure-i·Ai, most
Obtaining light output measurement result eventually is PhOutPut-i=gPOutPut-i；Wherein,G is light output correction coefficient.
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| CN107643538A (en) * | 2017-10-18 | 2018-01-30 | 中国检验检疫科学研究院 | A kind of device for being used to verify scintillator detector performance |
| CN107861147A (en) * | 2017-12-26 | 2018-03-30 | 同方威视技术股份有限公司 | Scintillator sensitivity measuring apparatus and measuring method |
| CN109298133B (en) * | 2018-07-18 | 2021-07-13 | 重庆邮电大学 | Detector module production yield improvement method based on edge channel correction |
| CN109541673B (en) * | 2018-11-19 | 2020-08-14 | 苏州瑞派宁科技有限公司 | Scintillation crystal testing arrangement |
| CN109490940B (en) * | 2018-12-14 | 2020-04-28 | 江苏赛诺格兰医疗科技有限公司 | Method for testing light-emitting decay time of scintillator array |
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