CN104808238A - Solid radium source field calibrating device and method - Google Patents
Solid radium source field calibrating device and method Download PDFInfo
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- CN104808238A CN104808238A CN201410040354.9A CN201410040354A CN104808238A CN 104808238 A CN104808238 A CN 104808238A CN 201410040354 A CN201410040354 A CN 201410040354A CN 104808238 A CN104808238 A CN 104808238A
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Abstract
The invention belongs to the technical field of nuclear and radiation environment monitor and measurement and particularly relates to a solid radium source field calibrating device and method. The device comprises a well-type ionization chamber (1), an electrometer (2), a low-energy gamma ray shielding device (3) and a source measurement rack (4). The method comprises the steps of determining of the optimal working area of the well-type ionization chamber, monitored measurement of a monitored source, field testing preparation, radium content calculation and the like. The application of the solid radium source field calibrating device to radioactive source calibration of uranium exploration changes the tracing manner of inspection of traditional radioactive sources and eliminates potential risks of movement and transportation of radioactive source tracing. The solid radium source field calibrating method achieves field calibration of solid radium sources.
Description
Technical field
The invention belongs to core and radiation environmental monitoring metering field technical field, be specifically related to a kind of solid radium source field calibration device and calibration steps thereof.
Background technology
Solid radium source is the standard radioactive source of uranium exploration Calibration of measuring instruments and STABILITY MONITORING, adopts plate ionization chamber to detect its radium content in the world always calibrate with China.Calibrating installation is made up of plate ionization chamber, dosemeter and a set of standard radium source, adopts to be calibrated the method that radium source and standard radium source alternately measure ionization current on ionization chamber and to calibrate, and the relative uncertainty degree of calibration result is generally 8%.
When adopting plane ionization chamber calibration solid radium source, the changes in environmental conditions such as humiture, atmospheric pressure and radium source to be measured are larger on measurement impact at the position on ionization chamber surface and height etc., need revise these influence factors, this device needs outfit standard radium source to compare measurement simultaneously, and the environmental baseline of field condition is wayward, and relate to standard radioactive source in calibration steps, therefore this device and calibration steps not easily improve calibration accuracy and realize the field calibration of radioactive source.
Along with the development of uranium resource ex-ploration, improve constantly reconnoitring measurement data precise requirements, current calibrating installation and calibration steps can not meet the demands; Simultaneously along with country strengthens the supervision that radioactive source moves transport, it is loaded down with trivial details time-consuming that radioactive source moves required " formality ", and most " censorship " units road is comparatively far away, also there is potential safety hazard in " censorship " transportation.Therefore realize the field calibration of solid radium source, the requirement of radioactive source applying unit and state supervision department can be met.At present, the relevant report about the field calibration realizing solid radium source is not yet had.
Summary of the invention
The object of this invention is to provide a kind of solid radium source field calibration device and the calibration steps thereof that can realize the field calibration of solid radium source.
The present invention is achieved in that
A kind of solid radium source field calibration device, comprises well-type ionization chamber, electrometer, low-energyγ-ray shield assembly and source and measures support; Wherein, electrometer is connected with well-type ionization chamber; Low-energyγ-ray shield assembly is arranged in well-type ionization chamber, and outer shape is consistent with the inner structure of well-type ionization chamber; Support is measured for installing tested radium source in source, is arranged in low-energyγ-ray shield assembly.
Well-type ionization chamber as above is the axisymmetric shape of sealing, belongs to 4 π space multistory angular measurements, fills the argon gas of moderate pressure in well-type ionization chamber; Well-type ionization chamber energy measurement scope covers in solid radium source
226the gamma-ray energy of Ra nucleic; The working environment scope of well-type ionization chamber is 10 ~ 35 DEG C, relative humidity 20% ~ 80%.
Low-energyγ-ray shield assembly as above comprises shield and top cover; Shield is well type, and external diameter is 60mm, and internal diameter is 34mm, and external height is 252mm, and outer shape is consistent with the inner structure of well-type ionization chamber; Top cover is arranged on shield, and it is stainless steel ring-type, and its external diameter is 80mm, and internal diameter is 34mm, is highly 20mm, adopts rivet mode to be connected with shield.
Shield as above is made up of lead shield layer and copper shield, and lead shield layer is arranged in copper shield; Lead shield layer is cylindric, and its diameter is 54mm, high 249mm, has that diameter is 34mm, the degree of depth is the axially extending bore of 239mm, and lead shield layer wall thickness is 10mm; Copper shield is made up of copper pipe and base, and copper pipe internal diameter is 54mm, long 249mm, and thickness is 3mm; The weld diameter of base is 60mm, thick 3mm.
Source as above is measured support and is comprised adjusting bracket and source fixator, source fixator is the cylindrical shape that organic glass one end is closed, and external diameter is 28mm, high 100mm, the external diameter of its internal diameter and tested radium source adapts, and makes the central axis of measured source and the central axes of ionization chamber.
Source as above fixator is one group, and its internal diameter is respectively 10mm, 12mm, 14mm, 16mm and 18mm, and the length of blind internal bore is 90mm, for the tested radium source of fixing different model.
Adjusting bracket external diameter 34mm, internal diameter 28mm, long 240mm as above, be highly the organic glass annulus of 10mm being welded with apart from 10-20mm place, its top, making adjusting bracket load the degree of depth in the well of low-energyγ-ray shield assembly is 220mm; Be processed with the long screw buckle of 30mm in adjusting bracket bottom inside, be 28mm by diameter, the perspex bar of long 30mm is processed into bolt, is arranged on adjusting bracket bottom inside, to regulate the height of adjusting bracket; Adjusting bracket outer wall marks score line, and score line position is determined by the best effort degree of depth of ionization chamber.
The solid radium source field calibration device of application as above described in any one carries out a method for field calibration, comprises the steps:
The first step: well-type ionization chamber best effort district measures;
Before ionization chamber comes into operation, point source different depth in ionization chamber well is adopted to measure, ionization chamber best effort district curve is made according to the response that the degree of depth and the correspondence of distance well head record, the peak of curve is the best operating point of ionization chamber, the response corresponding with best operating point place is more or less the same in the region of 0.1%, as the best effort district of ionization chamber;
Second step: the supervision in supervision source is measured;
When ionization chamber adopts standard radium source to trace to the source, adopt supervision source to measure, obtain supervision source and to trace to the source at ionization chamber the ionization current values I in moment
r; Before each in-site measurement, again adopt in laboratory supervision source to measure, obtain supervision source and calibrate period internal ionization current value I at the scene
r';
3rd step: on-the-spot test prepares;
Be placed in ionization chamber by low-energyγ-ray shield assembly, start more than preheating 30min, makes each parts of device and site environment reach balance, prepares to measure after regulating zero point; Loaded in the fixator of corresponding source according to tested radium source gauge size, regulate the screw of source adjusting bracket that the central point of tested radium source is overlapped with the score line of the first step, then put into well-type ionization chamber, after stablizing 10min, measure ionization current I;
4th step: radium content calculates;
Calculate ionization chamber stability modifying factor K ', the ionization current I being calibrated radium source recorded according to scene and ionization chamber are traced to the source the radium content calibration factor K obtained, and calculate the radium content of tested radium source.
The computing formula of stability modifying factor K ' as above is as follows:
K′＝I
R·exp(-λ·t)/I
R′ （1）
In formula, the stability modifying factor of K '---ionization chamber;
I
r---the ionization current that supervision source records when ionization chamber is traced to the source, A;
I
r'---the ionization current recorded in surrounding time section is measured in supervision source at the scene, A;
λ---the disintegration constant in supervision source, d
-1;
T---ionization chamber is traced to the source to time interval during in-site measurement, d.
The computing formula of the radium content of tested radium source as above is as follows:
m＝I·K·K′ （2）
In formula, m---be calibrated the radium content of radium source during field calibration, mg;
I---be calibrated the response of radium source in ionization chamber, A;
In formula, calibration factor K is that employing standard radium source carries out calibration acquisition to device, and its computing formula is as follows:
K＝m
0/I
0（3）
In formula, K---ionization chamber radium content calibration factor, A/mg;
I
0---the response of standard radium source in ionization chamber, A;
M
0---the radium content of standard radium source, mg.
Beneficial effect of the present invention is:
The well-type ionization chamber that present invention employs portable, enclosure-type and 4 π space measurements is applied to solid radium source calibration, and eliminate field environment condition influence factor, good stability, environment for use condition and range is wide, is suitable for the measurement under field condition environmental baseline; Adopt low-energyγ-ray shield assembly, different model radium source geometric condition is reduced to less than 1% on the impact of measuring by 10%, substantially increases measuring accuracy, different model radium source geometric condition can be eliminated on the impact of measuring, benefit the raising of measuring accuracy; Adopt adjustable source to measure support, make the tested radium source central spot of different model in the best effort district of ionization chamber, improve the repdocutbility of measurement; Adopt the radium content of ionization chamber calibration factor and the direct survey calculation radium source of supervision source stability modifying factor, instead of the traditional measurement method that standard source alternately measures comparison, make standard source independent of outside calibrating system, the passive transport of correcting device is the important prerequisite realizing field calibration.The application of field calibration device radioactive source calibration in uranium exploration in the present invention, changes the pattern of tracing to the source in typical radiation source " censorship ", eliminates radioactive source and traces to the source and mobile transport the potential safety hazard brought.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of solid radium source field calibration device of the present invention;
Fig. 2 is the left view of shield in the low-energyγ-ray shield assembly of a kind of solid radium source field calibration device of the present invention;
Fig. 3 is the vertical view of shield in the low-energyγ-ray shield assembly of a kind of solid radium source field calibration device of the present invention;
Fig. 4 is the left view of top cover in the low-energyγ-ray shield assembly of a kind of solid radium source field calibration device of the present invention;
Fig. 5 is the vertical view of top cover in the low-energyγ-ray shield assembly of a kind of solid radium source field calibration device of the present invention;
Fig. 6 is the structural representation of adjusting bracket in the source measurement support of a kind of solid radium source field calibration device of the present invention;
Fig. 7 is the structural representation of source fixator in the source measurement support of a kind of solid radium source field calibration device of the present invention;
In figure, 1. well-type ionization chamber, 2. electrometer, 3. low-energyγ-ray shield assembly, 4. support, 5. shield, 6. top cover, 7. adjusting bracket, 8. source fixator are measured in source.
Embodiment
Below in conjunction with the drawings and specific embodiments, a kind of solid radium source field calibration device of the present invention and calibration steps thereof are described:
As shown in Figure 1, a kind of solid radium source field calibration device, comprises well-type ionization chamber 1, electrometer 2, low-energyγ-ray shield assembly 3 and source and measures support 4.Wherein, well-type ionization chamber 1 is the axisymmetric shape of sealing, is generally well type, belongs to 4 π space multistory angular measurements, eliminates the impact that the geometric configuration such as the center of different model radium source, source housing diameter difference is brought; Applying argon gas in well-type ionization chamber 1, to improve the sensitivity of ionization chamber, reduces radioactivity statistic fluctuation when measuring, the moderate pressure (1.5 × 10 of applying argon gas in well-type ionization chamber 1
2pa), not easily leak, the stability of ionization chamber is reliable; Well-type ionization chamber 1 energy measurement scope is 30keV ~ 3MeV, covers in solid radium source
226the gamma-ray energy of Ra nucleic, has good energy response.The working environment scope of well-type ionization chamber 1 is (10 ~ 35) DEG C, as 10 DEG C, 25 DEG C or 35 DEG C; Relative humidity is 20% ~ 80%, as 20%, 50% or 80%.Well-type ionization chamber 1 can adopt the universal product to realize.
Electrometer 2 is connected with well-type ionization chamber 1, and its ionization current is measured long-time stability and is less than annual 0.2%, at 10 ~ 35 DEG C, as 10 DEG C, 25 DEG C or 35 DEG C; Relative humidity is 20% ~ 80%, and the deviation limit value responded in the scope as 20%, 50% or 80% is less than 0.5%, and its performance meets the requirement that field environment is measured completely.Electrometer 2 can adopt the universal product to realize.Electrometer 2 is common practise with the connected mode of well-type ionization chamber 1.
As shown in Figure 1, 2, low-energyγ-ray shield assembly 3 is arranged in well-type ionization chamber 1, and outer shape is consistent with the inner structure of well-type ionization chamber 1.In the present embodiment, low-energyγ-ray shield assembly 3 comprises shield 5 and top cover 6; Shield 5 is well type, and external diameter is 60mm, and internal diameter is 34mm, and external height is 252mm, and outer shape is consistent with the inner structure of well-type ionization chamber 1.In the present embodiment, shield 5 is made up of lead shield layer and copper shield, and lead shield layer is arranged in copper shield.Lead shield layer is cylindric, and its diameter is 54mm, high 249mm, has that diameter is 34mm, the degree of depth is the axially extending bore of 239mm, and lead shield layer wall thickness is 10mm.Copper shield is made up of copper pipe and base, and copper pipe internal diameter is 54mm, long 249mm, and thickness is 3mm; The weld diameter of base is 60mm, thick 3mm.By increasing copper shield outward at lead shield layer, the fluorescence-X ray of low Z materials can be absorbed.As shown in Figure 4,5, top cover 6 is arranged on shield 5, and it is stainless steel ring-type, and its external diameter is 80mm, and internal diameter is 34mm, is highly 20mm, adopts rivet mode to be connected with shield 5.
Support 4 is measured for installing tested radium source in source, it is arranged in low-energyγ-ray shield assembly 3, it comprises adjusting bracket 7 and source fixator 8, the cylindrical shape that source fixator 8 is closed for organic glass one end, external diameter is 28mm, high 100mm, and the external diameter of its internal diameter and tested radium source adapts, make the central axis of measured source and the central axes of ionization chamber, improve the repdocutbility measured.In the present embodiment, source fixator 8 is one group, its internal diameter is respectively 10mm, 12mm, 14mm, 16mm and 18mm, the length of blind internal bore is 90mm, for the tested radium source of fixing different model, as shown in Fig. 1,7, it is arranged on the inside of adjusting bracket 7, and the best effort degree of depth being in well-type ionization chamber by the center of school radium source is determined.Adjusting bracket 7 is organic glass rounding tubular, and it is arranged in low-energyγ-ray shield assembly 3, and its internal diameter is consistent with source fixator 8, is set with organic glass rounding ring in its top outer, is provided with the screw for regulating height bottom it.Part below the annulus of adjusting bracket 7 top is arranged in shield assembly 3.In the present embodiment, adjusting bracket external diameter 34mm, internal diameter 28mm, long 240mm, be highly the organic glass annulus of 10mm being welded with apart from 10-20mm place, its top, making adjusting bracket 7 load the degree of depth in the well of low-energyγ-ray shield assembly 3 is 220mm.Be processed with the long screw buckle of 30mm in adjusting bracket 7 bottom inside, be 28mm by diameter, the perspex bar of long 30mm is processed into bolt, is arranged on adjusting bracket 7 bottom inside, to regulate the height of adjusting bracket 7.Adjusting bracket 7 outer wall marks score line, and score line position is determined by the best effort degree of depth of ionization chamber.
Applying solid radium source field calibration device carries out a method for field calibration, comprises the steps:
The first step: well-type ionization chamber best effort district measures;
Before ionization chamber comes into operation, point source different depth in ionization chamber well is adopted to measure, ionization chamber best effort district curve is made according to the response that the degree of depth and the correspondence of distance well head record, the peak of curve is the best operating point of ionization chamber, the response corresponding with best operating point place is more or less the same in the region of 0.1%, as the best effort district of ionization chamber.In the present embodiment, the highest response point of ionization chamber is positioned at 142.5mm depths, (135 ~ 150) mm scope in response curve, the response of ionization chamber differs with the highest response point and is less than 0.1%, this section can be used as the best effort district of ionization chamber, the depth location of this regional extent and the highest response point is inscribed on source measurement support, when being convenient to measure, regulates the center position of tested radium source at every turn.
Second step: the supervision in supervision source is measured;
When ionization chamber adopts standard radium source to trace to the source, adopt supervision source to measure, obtain supervision source and to trace to the source at ionization chamber the ionization current values I in moment
r; Before each in-site measurement, again adopt in laboratory supervision source to measure, obtain supervision source and calibrate period internal ionization current value I at the scene
r'.
3rd step: on-the-spot test prepares;
Be placed in ionization chamber by low-energyγ-ray shield assembly, start more than preheating 30min, makes each parts of device and site environment (humiture etc.) reach balance, prepares to measure after regulating zero point; Loaded in corresponding source fixator 8 according to tested radium source gauge size, regulate the screw of source adjusting bracket 7 that the central point of tested radium source is overlapped with the score line of the first step, then put into well-type ionization chamber 1, after stablizing 10min, measure ionization current I.
4th step: radium content calculates;
Calculate ionization chamber stability modifying factor K ', the ionization current I being calibrated radium source recorded according to scene and ionization chamber are traced to the source the radium content calibration factor K obtained, and calculate the radium content of tested radium source.
The computing formula of stability modifying factor K ' is as follows:
K′＝I
R·exp(-λ·t)I
R′ （1）
In formula, the stability modifying factor of K '---ionization chamber;
I
r---the ionization current that supervision source records when ionization chamber is traced to the source, A;
I
r'---the ionization current recorded in surrounding time section is measured in supervision source at the scene, A;
λ---the disintegration constant in supervision source, d
-1;
T---ionization chamber is traced to the source to time interval during in-site measurement, d.
The computing formula of the radium content of tested radium source is as follows:
m＝I·K·K′ （2）
In formula, m---be calibrated the radium content of radium source during field calibration, mg;
I---be calibrated the response of radium source in ionization chamber, A;
In formula, calibration factor K is that employing standard radium source carries out calibration acquisition to device, and its computing formula is as follows:
K＝m
0/I
0（3）
In formula, K---ionization chamber radium content calibration factor, A/mg;
I
0---the response of standard radium source in ionization chamber, A;
M
0---the radium content of standard radium source, mg.
The well-type ionization chamber that present invention employs portable, enclosure-type and 4 π space measurements is applied to solid radium source calibration, and eliminate field environment condition influence factor, good stability, environment for use condition and range is wide, is suitable for the measurement under field condition environmental baseline; Adopt low-energyγ-ray shield assembly, different model radium source geometric condition is reduced to less than 1% on the impact of measuring by 10%, substantially increases measuring accuracy, different model radium source geometric condition can be eliminated on the impact of measuring, benefit the raising of measuring accuracy; Adopt adjustable source to measure support, make the tested radium source central spot of different model in the best effort district of ionization chamber, improve the repdocutbility of measurement; Adopt the radium content of ionization chamber calibration factor and the direct survey calculation radium source of supervision source stability modifying factor, instead of the traditional measurement method that standard source alternately measures comparison, make standard source independent of outside calibrating system, the passive transport of correcting device is the important prerequisite realizing field calibration.The application of field calibration device radioactive source calibration in uranium exploration in the present invention, changes the pattern of tracing to the source in typical radiation source " censorship ", eliminates radioactive source and traces to the source and mobile transport the potential safety hazard brought.The inventive method achieves the field calibration of solid radium source.
Claims (10)
1. a solid radium source field calibration device, comprises well-type ionization chamber (1), electrometer (2), low-energyγ-ray shield assembly (3) and source and measures support (4); Wherein, electrometer (2) is connected with well-type ionization chamber (1); Low-energyγ-ray shield assembly (3) is arranged in well-type ionization chamber (1), and outer shape is consistent with the inner structure of well-type ionization chamber (1); Support (4) is measured for installing tested radium source in source, is arranged in low-energyγ-ray shield assembly (3).
2. a kind of solid radium source field calibration device according to claim 1, is characterized in that: described well-type ionization chamber (1) is the axisymmetric shape of sealing, belongs to 4 π space multistory angular measurements, fills the argon gas of moderate pressure in well-type ionization chamber (1); Well-type ionization chamber (1) energy measurement scope covers in solid radium source
226the gamma-ray energy of Ra nucleic; The working environment scope of well-type ionization chamber (1) is 10 ~ 35 DEG C, relative humidity 20% ~ 80%.
3. a kind of solid radium source field calibration device according to claim 1, is characterized in that: described low-energyγ-ray shield assembly (3) comprises shield (5) and top cover (6); Shield (5) is well type, and external diameter is 60mm, and internal diameter is 34mm, and external height is 252mm, and outer shape is consistent with the inner structure of well-type ionization chamber (1); Top cover (6) is arranged on shield (5), and it is stainless steel ring-type, and its external diameter is 80mm, and internal diameter is 34mm, is highly 20mm, adopts rivet mode to be connected with shield (5).
4. a kind of solid radium source field calibration device according to claim 1, is characterized in that: described shield (5) is made up of lead shield layer and copper shield, and lead shield layer is arranged in copper shield; Lead shield layer is cylindric, and its diameter is 54mm, high 249mm, has that diameter is 34mm, the degree of depth is the axially extending bore of 239mm, and lead shield layer wall thickness is 10mm; Copper shield is made up of copper pipe and base, and copper pipe internal diameter is 54mm, long 249mm, and thickness is 3mm; The weld diameter of base is 60mm, thick 3mm.
5. a kind of solid radium source field calibration device according to claim 1, it is characterized in that: described source is measured support (4) and comprised adjusting bracket (7) and source fixator (8), the cylindrical shape that source fixator (8) is closed for organic glass one end, external diameter is 28mm, high 100mm, the external diameter of its internal diameter and tested radium source adapts, and makes the central axis of measured source and the central axes of ionization chamber.
6. a kind of solid radium source field calibration device according to claim 5, it is characterized in that: described source fixator (8) is one group, its internal diameter is respectively 10mm, 12mm, 14mm, 16mm and 18mm, and the length of blind internal bore is 90mm, for the tested radium source of fixing different model.
7. a kind of solid radium source field calibration device according to claim 5, it is characterized in that: described adjusting bracket external diameter 34mm, internal diameter 28mm, long 240mm, be highly the organic glass annulus of 10mm being welded with apart from 10-20mm place, its top, making adjusting bracket (7) load the degree of depth in the well of low-energyγ-ray shield assembly (3) is 220mm; Be processed with the long screw buckle of 30mm in adjusting bracket (7) bottom inside, be 28mm by diameter, the perspex bar of long 30mm is processed into bolt, is arranged on adjusting bracket (7) bottom inside, to regulate the height of adjusting bracket (7); Adjusting bracket (7) outer wall marks score line, and score line position is determined by the best effort degree of depth of ionization chamber.
8. application rights requires that the solid radium source field calibration device of 1-7 described in any one carries out a method for field calibration, comprises the steps:
The first step: well-type ionization chamber best effort district measures;
Before ionization chamber comes into operation, point source different depth in ionization chamber well is adopted to measure, ionization chamber best effort district curve is made according to the response that the degree of depth and the correspondence of distance well head record, the peak of curve is the best operating point of ionization chamber, the response corresponding with best operating point place is more or less the same in the region of 0.1%, as the best effort district of ionization chamber;
Second step: the supervision in supervision source is measured;
When ionization chamber adopts standard radium source to trace to the source, adopt supervision source to measure, obtain supervision source and to trace to the source at ionization chamber the ionization current values I in moment
r; Before each in-site measurement, again adopt in laboratory supervision source to measure, obtain supervision source and calibrate period internal ionization current value I at the scene
r';
3rd step: on-the-spot test prepares;
Be placed in ionization chamber by low-energyγ-ray shield assembly, start more than preheating 30min, makes each parts of device and site environment reach balance, prepares to measure after regulating zero point; Loaded in corresponding source fixator (8) according to tested radium source gauge size, the screw in adjustment source adjusting bracket (7) makes the central point of tested radium source overlap with the score line of the first step, then put into well-type ionization chamber (1), after stablizing 10min, measure ionization current I;
4th step: radium content calculates
Calculate ionization chamber stability modifying factor K ', the ionization current I being calibrated radium source recorded according to scene and ionization chamber are traced to the source the radium content calibration factor K obtained, and calculate the radium content of tested radium source.
9. a method according to claim 8, is characterized in that: the computing formula of described stability modifying factor K ' is as follows:
K′＝I
R·exp(-λ·t)/I
R′ （1）
In formula, the stability modifying factor of K '---ionization chamber;
I
r---the ionization current that supervision source records when ionization chamber is traced to the source, A;
I
r'---the ionization current recorded in surrounding time section is measured in supervision source at the scene, A;
λ---the disintegration constant in supervision source, d
-1;
T---ionization chamber is traced to the source to time interval during in-site measurement, d.
10. a method according to claim 8, is characterized in that: the computing formula of the radium content of described tested radium source is as follows:
m＝I·K·K′ （2）
In formula, m---be calibrated the radium content of radium source during field calibration, mg;
I---be calibrated the response of radium source in ionization chamber, A;
In formula, calibration factor K is that employing standard radium source carries out calibration acquisition to device, and its computing formula is as follows:
K＝m
0/I
0（3）
In formula, K---ionization chamber radium content calibration factor, A/mg;
I
0---the response of standard radium source in ionization chamber, A;
M
0---the radium content of standard radium source, mg.
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| CN108363093A (en) * | 2018-02-02 | 2018-08-03 | 北京康科达科技有限公司 | Well-type ionization chamber |
| CN108653937A (en) * | 2018-05-24 | 2018-10-16 | 上海联影医疗科技有限公司 | Dose monitoring device and linear accelerator |
| CN108776351A (en) * | 2018-06-14 | 2018-11-09 | 山东中测校准质控技术有限公司 | A kind of radioactive source activity measurement well-type ionization chamber |
| CN110261883A (en) * | 2019-06-27 | 2019-09-20 | 上海联影医疗科技有限公司 | Dose monitoring device and radiotherapy unit |
| CN111896995A (en) * | 2020-07-27 | 2020-11-06 | 核工业航测遥感中心 | Small body source model calibration method and device based on simulation comparison method |
| CN117724145A (en) * | 2024-02-07 | 2024-03-19 | 原子高科股份有限公司 | Method and device for acquiring activity of planar applicator, electronic equipment and storage medium |
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| CN108363093A (en) * | 2018-02-02 | 2018-08-03 | 北京康科达科技有限公司 | Well-type ionization chamber |
| CN108653937A (en) * | 2018-05-24 | 2018-10-16 | 上海联影医疗科技有限公司 | Dose monitoring device and linear accelerator |
| CN108776351A (en) * | 2018-06-14 | 2018-11-09 | 山东中测校准质控技术有限公司 | A kind of radioactive source activity measurement well-type ionization chamber |
| CN110261883A (en) * | 2019-06-27 | 2019-09-20 | 上海联影医疗科技有限公司 | Dose monitoring device and radiotherapy unit |
| CN111896995A (en) * | 2020-07-27 | 2020-11-06 | 核工业航测遥感中心 | Small body source model calibration method and device based on simulation comparison method |
| CN111896995B (en) * | 2020-07-27 | 2022-10-21 | 核工业航测遥感中心 | Small body source model calibration method and device based on simulation comparison method |
| CN117724145A (en) * | 2024-02-07 | 2024-03-19 | 原子高科股份有限公司 | Method and device for acquiring activity of planar applicator, electronic equipment and storage medium |
| CN117724145B (en) * | 2024-02-07 | 2024-05-14 | 原子高科股份有限公司 | Method and device for acquiring activity of planar applicator, electronic equipment and storage medium |
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