CN106970409A - The γ absorbed dose rates instrument corrected with soil moisture and bearing calibration - Google Patents
The γ absorbed dose rates instrument corrected with soil moisture and bearing calibration Download PDFInfo
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- CN106970409A CN106970409A CN201710346020.8A CN201710346020A CN106970409A CN 106970409 A CN106970409 A CN 106970409A CN 201710346020 A CN201710346020 A CN 201710346020A CN 106970409 A CN106970409 A CN 106970409A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/02—Dosimeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/005—Details of radiation-measuring instruments calibration techniques
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Life Sciences & Earth Sciences (AREA)
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- High Energy & Nuclear Physics (AREA)
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Abstract
The invention discloses a kind of γ absorbed dose rate instrument corrected with soil moisture, including detector and main frame, the detector includes the detecting head in housing and housing, straight down, top is disposed with photomultiplier and pre-amplification circuit to the detecting head, and detector both sides are respectively equipped with a strut, strut bottom exceedes detector bottom, slide bar is respectively equipped with strut, the slide bar lower surface is respectively fixedly connected with a tensiometer, and the output end of the tensiometer is connected with main frame.The present invention can obtain actual measurement data to detector and be corrected in real time according to humidity, data more accurately and reliably, is being met the requirement that sample need to be used to compare and judge under the dry condition after humidity correcting.
Description
Technical field
The present invention relates to a kind of nuclear radiation detection technology, more particularly to a kind of γ absorbed dose rates corrected with soil moisture
Instrument and bearing calibration.
Background technology
With the high speed development of nuclear industry and Application of Nuclear Technology industry, nuclear detection technology is also flourished.Because
Gamma dose rate instrument is mainly used in the measurement to surrounding air absorbed dose rate, with the spy such as working stability, portable, sensitivity is high
Point, is a kind of important means of environment radiation dose monitoring on the spot, in terms of radiation environmental monitoring, slag radiation dose monitoring
It is widely used.
Disturbing factor suffered by field condition gamma dose measurement is more, such as measures the influence of soil water content.In rainfall
In, moisture is preserved in the hole of soil, soil texture is present in certain porosity, space changes soil after filling moisture
Material composition, when gamma-rays is in the process by soil, scattering, photoelectric cross-section change so that cut its useful effect
Face changes；When gamma-rays is after by soil, the structure for reaching ground power spectrum changes, and then influences gamma dose rate
Measured value, it is impossible to accurately reflect true radiation environment.So the data measured are inaccurate, produced when how to remove measurement
Raw interference, and accurate measurement data can be effectively got in real time, it is the problem of we need to solve.
The content of the invention
The purpose of the present invention is that offer one kind solves the above problems, and simple in construction, measurement is convenient, and makes the number that measures
According to the γ absorbed dose rates instrument and bearing calibration more accurately and reliably corrected with soil moisture.
To achieve these goals, the technical solution adopted by the present invention is such：A kind of γ corrected with soil moisture
Absorbed dose rate instrument, including detector and main frame, the detector are gamma-ray for detecting Radionuclides in Soil generation
Air absorbed dose of radiation, the detector includes the detecting head in housing and housing, and straight down, top is set the detecting head successively
Photomultiplier and pre-amplification circuit are equipped with, the detecting head output end is connected after photomultiplier and pre-amplification circuit
Main frame, the detector both sides are respectively equipped with a strut, and the detector both sides are fixedly connected with strut, and strut bottom exceedes
A level, and the slide bar that can be slided up and down along strut, the slide bar lower surface difference are respectively equipped with detector bottom, strut
A tensiometer is fixedly connected with, the output end of the tensiometer is connected with main frame.
As preferred：The output end of the main frame connects a PDA data acquisition units, the number for recording collection main frame output
According to.
As preferred：Crystal detection size is 50 × 50mm plastic scintillator detector, the support during detector
Bar is made with slide bar from metallic aluminum material.
A kind of γ absorbed dose rates instrument corrected with soil moisture and bearing calibration, comprise the following steps；
(1) simulation is obtained in the γ absorbed dose rate instrument corrected with soil moisture, and detector is in different humidity soil environment
In gamma ray counting, air absorbed dose of radiation is converted into according to instrumental calibration formula；
Specific method is：The pedotheque that a soil moisture is 0% is chosen, the γ of insert band soil moisture correction absorbs
Dose rate instrument, obtains the gamma ray counting of detector, and repeatedly the water content of increase soil to soil moisture is 50%, obtains different
Detector gamma ray counting under water content state, and air under different moisture content state is converted into by instrumental calibration formula inhaled
Receive close rate；
(2) the correction coefficient C under the conditions of different humidity is solved,
Wherein, DHMeasurement obtains Dose Rate, D when for water content being HdryIt is 0% space-time aspiration for water content
Dosage；
(3) using humidity H as abscissa, correction coefficient C is ordinate, is fitted to water content and correction coefficient C graphs of a relation, and
Following formula is drawn according to the graph of a relation
C=aH+b, (formula 2),
Wherein a, b are the proportionality coefficient drawn by formula；
(4) during actual measurement, distinguished with that tensiometer in the γ absorbed dose rate instrument corrected with soil moisture
Soil moisture to be measured is obtained, and is averaged, soil actual humidity value D as to be measuredH is real, by DH is realBring formula (2) into and calculate actual
The correction coefficient C of humidityIt is real, then by CIt is realBring into and actual Dose Rate D is calculated in formula (1)Dry is real。
Compared with prior art, the advantage of the invention is that：Tensiometer and detector are combined together.One side
Face, tensiometer can adjust height, be convenient for measuring, and combine the respective counting calculating average value of two tensiometers, with
This reduces error, so as to synchronize measurement to pedotheque humidity, obtains humidity and counts.On the other hand it is then by detection
Device is measured pedotheque in real time, the absorbed dose rate measured is transferred on the main frame of the present apparatus.Finally by wet
Degree correction equation to carry out real time correction to Dose Rate, the data completed by PDA data acquisition units to correction
Carry out record collection.
Such benefit is：(1) actual measurement data is caused more accurately and reliably, to meet sample after humidity correcting
The requirement compared and judged need to be used under the dry condition.
(2) after humidity amendment, it is that the analysis of different samples reduces parameter influence, adds making for gamma dose rate instrument
Use scope.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is water content and correction coefficient C graph of a relation；
Fig. 3 is the water content that is fitted and correction coefficient C graphs of a relation in embodiment 2；
Fig. 4 is the front and rear absorbed dose of radiation comparison diagram of correction in embodiment 2.
In figure：1st, housing；2nd, detecting head；3rd, photomultiplier；4th, pre-amplification circuit；5th, strut；6th, slide bar；7th, soil
Hygrometer；8th, PDA data acquisition units.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Embodiment 1：Referring to Fig. 1 and Fig. 2, a kind of γ absorbed dose rate instrument corrected with soil moisture, including detector and
Main frame, the detector is used to detect the gamma-ray air absorbed dose of radiation of Radionuclides in Soil generation, the detector bag
The detecting head 2 in housing 1 and housing 1 is included, straight down, top is disposed with photomultiplier 3 and preposition to the detecting head 2
Amplifying circuit 4, the output end of detecting head 2 connects main frame, the detector after photomultiplier 3 and pre-amplification circuit 4
Both sides are respectively equipped with a strut 5, and the detector both sides are fixedly connected with strut 5, and the bottom of strut 5 exceedes detector bottom,
A level, and the slide bar 6 that can be slided up and down along strut 5 are respectively equipped with strut 5, the lower surface of slide bar 6 is fixed respectively to be connected
A tensiometer 7 is connect, the output end of the tensiometer 7 is connected with main frame.The output end of the main frame connects a PDA numbers
According to collector 8, the data for recording collection main frame output, crystal detection size is 50 × 50mm plastics during the detector
Scintillator detector, the strut 5 is made with slide bar 6 from metallic aluminum material.
Produce gamma-ray air absorbed dose of radiation present invention is mainly used for in-situ measurement to Radionuclides in Soil, not by
On-site soil humidity is limited, and obtained data are accurately and fast.And measurement gets up very convenient.
Wherein, tensiometer 7 and detector are combined together, on the one hand, tensiometer 7 can adjust height, side
Just in the scene insertion of varying environment, and measure, the respective counting of two tensiometers 7 calculates average value, with this
To reduce error, so as to synchronize measurement to pedotheque humidity, obtain humidity and count.
On the other hand, pedotheque is measured in real time by detector, is transferred to the absorbed dose rate measured
On the main frame of the present apparatus.
Main frame gets humidity data, and detector data, with reference to following method, by humidity correcting equation come
Real time correction is carried out to Dose Rate, the data completed by PDA data acquisition units 8 to correction carry out record and adopted
Collection.
Specific method is as follows：
A kind of γ absorbed dose rates instrument corrected with soil moisture and bearing calibration, specifically include following steps：
The first step：Obtain correction equation；
(1) simulation is obtained in the γ absorbed dose rate instrument corrected with soil moisture, and detector is in different humidity soil environment
In gamma ray counting, air absorbed dose of radiation is converted into according to instrumental calibration formula；
Specific method is：The pedotheque that a soil moisture is 0% is chosen, the γ of insert band soil moisture correction absorbs
Dose rate instrument, obtains the gamma ray counting of detector, and repeatedly the water content of increase soil to soil moisture is 50%, obtains different
Detector gamma ray counting under water content state, and air under different moisture content state is converted into by instrumental calibration formula inhaled
Receive close rate；
(2) the correction coefficient C under the conditions of different humidity is solved,
Wherein, DHMeasurement obtains Dose Rate, D when for water content being HdryIt is 0% space-time aspiration for water content
Dosage；
(3) using humidity H as abscissa, correction coefficient C is ordinate, is fitted to water content and correction coefficient C graphs of a relation, and
Following formula is drawn according to the graph of a relation
C=aH+b, (formula 2),
Wherein a, b are the proportionality coefficient drawn by formula；
Second step：Actual measurement, and combine the Dose Rate that correction equation obtains reality；
(4) during actual measurement, distinguished with that tensiometer 7 in the γ absorbed dose rate instrument corrected with soil moisture
Soil moisture to be measured is obtained, and is averaged, soil actual humidity value D as to be measuredH is real, by DH is realBring formula (2) into and calculate actual
The correction coefficient C of humidityIt is real, then by CIt is realBring into and actual Dose Rate D is calculated in formula (1)Dry is real。
Tensiometer 7 and detector are combined together by the present invention, are surveyed according to the humidity of soil come tuning detector
Value, reach reduce error purpose.
Wherein, detector both sides are respectively equipped with a tensiometer 7, with reference to the respective counting of two tensiometers 7
Average value is calculated, error is reduced with this.
Firstly the need of the correction coefficient C under the conditions of calculating different humidity, first simulated experiment is 0%- according to soil moisture
50%, the correction coefficient C under the conditions of different humidity is obtained, and water content and correction coefficient C graphs of a relation are fitted, according to graph of a relation
Updating formula is obtained, during actual measurement, it is only necessary to the numerical value of detector detection is corrected according to the humidity of actual measurement.Finally by
PDA data acquisition units 8 to carry out record collection to the data that correction is completed.The present invention is simple in construction, is easy to carry, and surveys in real time
The data of amount are accurate.
Embodiment 2：
Referring to Fig. 3 and Fig. 4, simulated experiment is carried out from a soil in somewhere, moisture environment is respectively 0,10%,
20%, 30% and 40%, measure the Dose Rate under different humidity.
As seen from the figure, as humidity increases, absorbed dose of radiation reduces by 269nGy/h, and be reduced to is in 40% moisture
178nGy/h.It is 3.2% with worst error when drying after correction.Its measured value is compared as follows table 1：
Table 1：Correct fore-and-aft survey numeric ratio
Claims (4)
1. a kind of γ absorbed dose rate instrument corrected with soil moisture, it is characterised in that：Including detector and main frame, the detection
Device is used to detect the gamma-ray air absorbed dose of radiation of Radionuclides in Soil generation, and the detector is included in housing and housing
Detecting head, straight down, top is disposed with photomultiplier and pre-amplification circuit, the detecting head to the detecting head
Output end connects main frame after photomultiplier and pre-amplification circuit, and the detector both sides are respectively equipped with a strut, described
Detector both sides are fixedly connected with strut, and strut bottom exceedes detector bottom, are respectively equipped with a level, and energy on strut
The slide bar slided up and down along strut, the slide bar lower surface is respectively fixedly connected with a tensiometer, the tensiometer
Output end is connected with main frame.
2. the γ absorbed dose rate instrument according to claim 1 corrected with soil moisture, it is characterised in that：The main frame
Output end connects a PDA data acquisition units, the data for recording collection main frame output.
3. the γ absorbed dose rate instrument according to claim 1 corrected with soil moisture, it is characterised in that：The detector
When crystal detection size be 50 × 50mm plastic scintillator detector, the strut is made with slide bar from metallic aluminum material.
4. the γ absorbed dose rates instrument according to claim 1 corrected with soil moisture and bearing calibration, it is characterised in that：
Comprise the following steps；
(1) simulation is obtained in the γ absorbed dose rate instrument corrected with soil moisture, and detector is in different humidity soil environment
Gamma ray counting, air absorbed dose of radiation is converted into according to instrumental calibration formula；
Specific method is：Choose the pedotheque that a soil moisture is 0%, the γ absorbed doses of radiation of insert band soil moisture correction
Rate instrument, obtains the gamma ray counting of detector, and repeatedly the water content of increase soil to soil moisture is 50%, obtains different water cut
Detector gamma ray counting under amount state, and it is converted into by instrumental calibration formula the air absorbent under different moisture content state
Dose rate；
(2) the correction coefficient C under the conditions of different humidity is solved,
Wherein, DHMeasurement obtains Dose Rate, D when for water content being HdryIt is 0% space-time aspiration dosage for water content；
(3) using humidity H as abscissa, correction coefficient C is ordinate, is fitted to water content and correction coefficient C graphs of a relation, and according to
The graph of a relation draws following formula
C=aH+b, (formula 2),
Wherein a, b are the proportionality coefficient drawn by formula；
(4) during actual measurement, obtained respectively with that tensiometer in the γ absorbed dose rate instrument corrected with soil moisture
Soil moisture to be measured, and average, soil actual humidity value D as to be measuredH is real, by DH is realBring formula (2) into and calculate actual humidity
Correction coefficient CIt is real, then by CIt is realBring into and actual Dose Rate D is calculated in formula (1)Dry is real。
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