CN102087364B - Equipment and method for detecting static sensitivity and false alarm rate of gate-type radiation monitor - Google Patents
Equipment and method for detecting static sensitivity and false alarm rate of gate-type radiation monitor Download PDFInfo
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- CN102087364B CN102087364B CN 200910242084 CN200910242084A CN102087364B CN 102087364 B CN102087364 B CN 102087364B CN 200910242084 CN200910242084 CN 200910242084 CN 200910242084 A CN200910242084 A CN 200910242084A CN 102087364 B CN102087364 B CN 102087364B
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Abstract
The invention relates to a radiation monitoring technology, in particular to equipment and method for detecting the static sensitivity and the false alarm rate of a gate-type radiation monitor. The equipment comprises a bracket with castor wheels, wherein the bracket is provided with a radioactive source lifting motion device and a control device; the radioactive source lifting motion device comprises a deceleration linear motor and a buffer type linear motion mechanism; the buffer type linear motion mechanism is connected with a slide rod, the slide rod longitudinally passes through a lead chamber, and the top of the slide rod is provided with a radioactive source box; a plurality of position detectors are longitudinally arranged below the radioactive source lifting motion device and connected with a linear motion controller; and the linear motion controller is connected with a digital display timer. The device can be used for finishing testing the static sensitivity and the false alarm rate of the gate-type radiation monitor and provides a technical guarantee for the development and the regular testing and checking in a using process of the instruments.
Description
Technical field
The present invention relates to the Radiation monitoring technology, be specifically related to a kind of gate-type radiation monitor static sensitivity and false alarm rate checkout equipment and method.
Background technology
In recent years; international community draws attention day by day for core terror and radioactive sources safety problem; many countries are at important nuclear facilities (as nuclear power station, reprocessing plant), border port, airport, harbour, highway, Foundry Works, steelworks, spoil area, waste residue landfill yard and incinerate factory, big assembly place etc. and all install and be equipped with checkout equipment; therefore gate-type radioactive pollution monitoring instrument arises at the historic moment, and it is the Main Means that military nuclear material occurs and protects for anti-terrorism, prevention radioactive sources safety accident.
This kind equipment of gate-type radiation monitor is mostly the long-term use of outdoor fixed installation, and running environment is abominable, in the research and development type-approval process of use procedure and equipment, all needs to carry out periodic calibration and detects, to guarantee the detection performance of this kind equipment.Have many parameters to assess the performance of this quasi-instrument, wherein static sensitivity and false alarm rate are the Main physical amounts of weighing this class complex instrument.Particularly in order to obtain the data of false alarm rate, need to accurately controlling under the condition of irradiation time, according to the requirement of logical sequence, carry out the test of tens thousand of times to instrument.So, be necessary very much to carry out the calibration of static sensitivity and false alarm rate and detection method research, set up static sensitivity and false alarm rate automatic calibration and pick-up unit, but the device of accurate timing, and the detection sensitivity of determining instrument affects rule and false alarm rate with different nucleic.
Summary of the invention
The object of the present invention is to provide a kind of gate-type radiation monitor static sensitivity and false alarm rate checkout equipment and method, for the performance of assessing the gate-type radiation monitor provides reliable foundation.
Technical scheme of the present invention is as follows: a kind of gate-type radiation monitor static sensitivity and false alarm rate checkout equipment, comprise the support with castor, support is provided with radioactive source elevating movement device and control device, described radioactive source elevating movement device comprises deceleration linear electric motors and buffer-type straight-line motion mechanism, the buffer-type straight-line motion mechanism is connected with slide bar, slide bar vertically passes vitriol chamber, and the top of slide bar is provided with radiation source container; Vertically be provided with several position detectors below radioactive source elevating movement device, position detector is connected with the rectilinear motion controller, and the rectilinear motion controller connects the digital display timer.
Further, gate-type radiation monitor static sensitivity as above and false alarm rate checkout equipment, wherein, described deceleration linear electric motors are connected with the rectilinear motion controller by frequency converter.
Further, gate-type radiation monitor static sensitivity as above and false alarm rate checkout equipment, wherein, described position detector has 3, the null position of a bottom corresponding slide bar, middle position that corresponding digital display timer begins to count and finish to count, the topmost position that corresponding slide bar rises to peak and begins to return.
Further, gate-type radiation monitor static sensitivity as above and false alarm rate checkout equipment wherein, are provided with control panel on support, control panel is provided with and controls the rising button, controls the decline button, shines play button, and the display interface of digital display timer.
A kind of the said equipment that uses comprises the steps: the method that gate-type radiation monitor static sensitivity detects
(1) checkout equipment is placed between two detectors of gate-type radiation monitor, select suitable radioactive source to be placed in the radiation source capsule of checkout equipment, and radioactive source is placed in vitriol chamber, the distance between the detector sensitive center of radioactive source and gate-type radiation monitor is set simultaneously;
(2) measure the sample-out count of gate-type radiation monitor, and calculate the mean value of sample-out count;
(3) trigger the gate-type radiation monitor and enter measuring state, and the radioactive source of checkout equipment is risen from vitriol chamber;
(4) record the measurement count of gate-type radiation monitor, record at least 20 countings, and the mean value of computation and measurement counting, the mean value by measurement count deducts the mean value of sample-out count and is only counted;
(5) the radioactive source half life period is revised, calculated detection efficiency, detection efficiency=clean revised activity of counting/radioactive source;
(6) according to parameter--the minimum detectable lower limit MDA of following formula computational representation static sensitivity,
Wherein, BN is sample-out count mean value, and T is Measuring Time, and ρ is detection efficiency.
Further, gate-type radiation monitor static sensitivity detection method as above, the method also comprises step (seven), change the radioactive source of different activity, perhaps change the Measuring Time T of gate-type radiation monitor, perhaps change the distance between the detector sensitive center of radioactive source and gate-type radiation monitor, repeating step () determines that to step (sixs') operation minimum detectable lower limit MDA is with the impact of different factors vary.
A kind of the said equipment that uses comprises the steps: the method that gate-type radiation monitor false alarm rate detects
(I) is placed on checkout equipment between two detectors of gate-type radiation monitor, select suitable radioactive source to be placed in the radiation source capsule of checkout equipment, and radioactive source is placed in vitriol chamber, the distance between the detector sensitive center of radioactive source and gate-type radiation monitor is set simultaneously;
(II) is in the measuring period of the gate-type radiation monitor of 70 seconds, wherein be used for sample-out count in 60 seconds, upgrade background, trigger the gate-type radiation monitor in 10 seconds and enter measuring state, in 10 seconds measure, the radioactive source of checkout equipment is risen from vitriol chamber, acting in conjunction by position detector and rectilinear motion controller, complete irradiation in a time 1 second, and make radioactive source return to vitriol chamber, the exposure period of 1 second is by regulating the rotating speed of Frequency Converter Control deceleration linear electric motors, and then controls that the rising or falling speed of radioactive source guarantees; Perhaps, in 10 seconds measured, radioactive source did not rise, and completes 1 passive irradiation;
(III) is recorded in the gate-type radiation monitor in N measuring period, and radioactive source rises the times N of completing active irradiation
1, during active irradiation, the gate-type radiation monitor does not have the times N of warning
2, and radioactive source is retained in vitriol chamber, do not rise, complete the times N of passive irradiation
3, during passive irradiation, the times N of warning occurs in the gate-type radiation monitor
4Wherein, N=N
1+ N
3
(IV) calculates false alarm rate=(N
2+ N
4)/(N
1+ N
3).
Beneficial effect of the present invention is as follows: by equipment provided by the present invention and method, can determine that the detection sensitivity of gate-type radiation monitor is with the impact of different nucleic variations, and different measuring time and different distance are on the impact of detection sensitivity, carry out the false alarm rate testing research, promote the R﹠D process of this quasi-instrument, guarantee consistance and the reliability of measurement result.
Description of drawings
Fig. 1 is the fundamental diagram of present device;
Fig. 2 is the external structure schematic diagram of present device;
Fig. 3 is for detecting the working timing figure of false alarm rate.
In figure, 1. vitriol chamber 2. radiates 8. automatic air-break switch 9. frequency converter 10. control panel 11. rectilinear motion controller 12. pilot lamp 13. digital display timers 14. control rising buttons 15. control decline buttons 16. irradiation play button 17. support 18. castors of source capsule 3. buffer-type straight-line motion mechanism 4. deceleration linear electric motors 5. slide bar 6. position detector 7. input powers (AV220V)
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in Figure 1 and Figure 2, gate-type radiation monitor static sensitivity provided by the present invention and false alarm rate checkout equipment comprise the support 17 with castor 18, and support 17 is provided with radioactive source elevating movement device and control device.Described radioactive source elevating movement device comprises deceleration linear electric motors 4 and buffer-type straight-line motion mechanism 3, buffer-type straight-line motion mechanism 3 is connected with slide bar 5, buffer-type straight-line motion mechanism 3 is the common mechanisms in plant equipment, its function is that rotatablely moving of the output shaft of motor 4 is converted into moving up and down of slide bar 5, on the Upper-lower Limit position of slide bar 5 motion, spring bumper is installed, makes slide bar when rising to top and dropping to bottommost, can play the effect of buffering.Slide bar 5 vertically passes vitriol chamber 1, and the top of slide bar 5 is provided with radiation source capsule 2; Vertically be provided with three position detectors 6 below radioactive source elevating movement device, position detector 6 is connected with rectilinear motion controller 11, and rectilinear motion controller 11 connects digital display timer 13.In three position detectors 6, the null position of a bottom corresponding slide bar, middle position that corresponding digital display timer begins to count and finish to count, the topmost position that corresponding slide bar rises to peak and begins to return.Deceleration linear electric motors 4 are connected with rectilinear motion controller 11 by frequency converter 9, and frequency converter 9 is connected with input power 7 by automatic air-break switch 8.Be provided with control panel 10 on support 17, control panel 10 is provided with and controls rising button 14, controls decline button 15, shines play button 16, and the display interface of digital display timer 13.Said structure changes deceleration linear electric motors 4 working power frequencies by frequency converter 9 and reaches the purpose that changes motor speed, realizes regulating the time of slide bar 5 oscilaltion campaigns.Three position detectors 6 detect lifting position, trigger 13 beginnings of digital display timer and stop counting, and showing the irradiation time of record.Pilot lamp 12 is used to refer to null position, three action buttons, and the control of completing respectively rising, decline, irradiation work triggers.The radiation source capsule is used for placing needed radioactive source, and vitriol chamber 1 is used for shielding, stores radioactive source.
Gate-type radiation monitor static sensitivity and false alarm rate checkout equipment are by controlling deceleration linear electric motors and buffer-type straight-line motion mechanism, radiation source container to be shifted out from the vitriol chamber fast rise, or descend and enter vitriol chamber, or after pulsed exposure fast return to vitriol chamber.
After powering on for the first time, if slide bar not at null position, run indicator " flicker " is pressed " control rise " or " control and descend " button and is adjusted slide bar.(detected by nethermost position detector) when slide bar moves to null position, run indicator " is gone out ".Press " irradiation work " button, after system completes pulsed exposure automatically, the working cycle of vitriol chamber is arrived in fast return, and records the irradiation working time.If the timer cumulative time, during greater than 1.00 seconds, pressing " ▲ key " on frequency-changer operation panel increases frequency, and the time presses " key " and reduces frequency during less than 1.00 second on frequency-changer operation panel, press frequency converter ENTER key after the frequency adjustment and confirm.Operation above repeating is also recorded the timer time until the time is adjusted into 1.00 seconds.
Press " control and rise " button and adjust slide bar and rise to peak (being detected by uppermost position detector), change radioactive source.Press " control and descend " button, allow slide bar drop to null position, run indicator " is gone out ".Press " irradiation work " button, slide bar rises to counting starting position (being detected by middle position detector), timer begins timing, return after arriving the extreme higher position at once, drop to and count the starting position, timer stops, and timer is completed 1.00 second time-count cycle, slide bar continues to descend until null position stops, and completes a work period.
Use this equipment to carry out gate-type radiation monitor static sensitivity and detect, comprise the steps:
(1) checkout equipment is placed between two detectors of gate-type radiation monitor, select suitable radioactive source to be placed in the radiation source capsule of checkout equipment, and radioactive source is placed in vitriol chamber, the distance between the detector sensitive center of radioactive source and gate-type radiation monitor is set simultaneously;
(2) measure the sample-out count of gate-type radiation monitor, and calculate the mean value of sample-out count;
(3) trigger the gate-type radiation monitor and enter measuring state, and the radioactive source of checkout equipment is risen from vitriol chamber;
(4) record the measurement count of gate-type radiation monitor, record at least 20 countings, and the mean value of computation and measurement counting, the mean value by measurement count deducts the mean value of sample-out count and is only counted;
(5) according to following formula, the radioactive source half life period is revised, calculated detection efficiency, detection efficiency=clean revised activity of counting/radioactive source;
In formula: the revised radioactive source activity of A,
A
0The initial activity of radioactive source,
The t Radioactive Source Decay time,
T
0The half life period of radioactive source;
(6) according to parameter--the minimum detectable lower limit MDA of following formula computational representation static sensitivity,
Wherein, BN is sample-out count mean value, and T is Measuring Time, and ρ is detection efficiency;
(7) change the radioactive source of different activity, perhaps change the Measuring Time T of gate-type radiation monitor, perhaps change the distance (being respectively 0.5 meter, 1 meter, 2 meters) between the detector sensitive center of radioactive source and gate-type radiation monitor, repeating step (one) determines that to step (sixs') operation minimum detectable lower limit MDA is with the impact of different factors vary.
In the false alarm rate test that utilizes the said equipment to carry out, should keep radioactive source lifting and gate-type monitor occupancy sensor trigger pip to carry out according to strict sequential, detect the work schedule of false alarm rate as shown in Figure 3.Particularly stipulate radioactive source irradiation time 1 second only, its timing accuracy has considerable influence to measurement result.Adopt above-mentioned advanced person's electromechanical integration technology can guarantee the timing accuracy of system, satisfy the false alarm rate test condition.
False alarm rate is divided into 2 kinds of situations: the one, fail to report, and active appearance, and there is no the situation of reporting to the police; The 2nd, wrong report, the situation of reporting to the police but appears in passive appearance.
Use this equipment to carry out gate-type radiation monitor false alarm rate and detect, comprise the steps:
(I) is placed on checkout equipment between two detectors of gate-type radiation monitor, select suitable radioactive source to be placed in the radiation source capsule of checkout equipment, and radioactive source is placed in vitriol chamber, the distance between the detector sensitive center of radioactive source and gate-type radiation monitor is set simultaneously;
(II) is in the measuring period of the gate-type radiation monitor of 70 seconds, wherein be used for sample-out count in 60 seconds, upgrade background, trigger the gate-type radiation monitor in 10 seconds and enter measuring state, in 10 seconds measure, the radioactive source of checkout equipment is risen from vitriol chamber, acting in conjunction by position detector and rectilinear motion controller, complete irradiation in a time 1 second, and make radioactive source return to vitriol chamber, the exposure period of 1 second is by regulating the rotating speed of Frequency Converter Control deceleration linear electric motors, and then controls that the rising or falling speed of radioactive source guarantees; Perhaps, in 10 seconds measured, radioactive source did not rise, and completes 1 passive irradiation;
(III) is recorded in the gate-type radiation monitor in N measuring period, and radioactive source rises the times N of completing active irradiation
1, during active irradiation, the gate-type radiation monitor does not have the times N of warning
2, and radioactive source is retained in vitriol chamber, do not rise, complete the times N of passive irradiation
3, during passive irradiation, the times N of warning occurs in the gate-type radiation monitor
4Wherein, N=N
1+ N
3
(IV) calculates false alarm rate=(N
2+ N
4)/(N
1+ N
3).
The present invention is by design gate-type radiation monitor static sensitivity and false alarm rate checkout equipment, carry out static sensitivity and the research of false alarm rate detection method, thereby can assess, calibrate, detect the performance of gate-type radiation monitor, for routine test check in the research and development of this quasi-instrument and use procedure provides technical guarantee.
Claims (6)
1. a gate-type radiation monitor static sensitivity and false alarm rate checkout equipment, comprise the support (17) with castor (18), support (17) is provided with radioactive source elevating movement device and control device, it is characterized in that: described radioactive source elevating movement device comprises deceleration linear electric motors (4) and buffer-type straight-line motion mechanism (3), buffer-type straight-line motion mechanism (3) is connected with slide bar (5), slide bar (5) vertically passes vitriol chamber (1), and the top of slide bar (5) is provided with radiation source capsule (2); Vertically be provided with 3 position detectors (6) below radioactive source elevating movement device, the null position of a bottom corresponding slide bar, middle position that corresponding digital display timer begins to count and finish to count, position that corresponding slide bar rises to peak and begins to return, the top, position detector (6) is connected with rectilinear motion controller (11), and rectilinear motion controller (11) connects digital display timer (13).
2. gate-type radiation monitor static sensitivity as claimed in claim 1 and false alarm rate checkout equipment is characterized in that: described deceleration linear electric motors (4) are connected with rectilinear motion controller (11) by frequency converter (9).
3. gate-type radiation monitor static sensitivity as claimed in claim 1 or 2 and false alarm rate checkout equipment, it is characterized in that: be provided with control panel (10) on support (17), control panel (10) is provided with and controls rising button (14), controls decline button (15), shines play button (16), and the display interface of digital display timer (13).
4. a right to use requires that described in 1, equipment to the method that gate-type radiation monitor static sensitivity detects, comprises the steps:
(1) checkout equipment is placed between two detectors of gate-type radiation monitor, select suitable radioactive source to be placed in the radiation source capsule of checkout equipment, and radioactive source is placed in vitriol chamber, the distance between the detector sensitive center of radioactive source and gate-type radiation monitor is set simultaneously;
(2) measure the sample-out count of gate-type radiation monitor, and calculate the mean value of sample-out count;
(3) trigger the gate-type radiation monitor and enter measuring state, and the radioactive source of checkout equipment is risen from vitriol chamber;
(4) record the measurement count of gate-type radiation monitor, record at least 20 countings, and the mean value of computation and measurement counting, the mean value by measurement count deducts the mean value of sample-out count and is only counted;
(5) the radioactive source half life period is revised, calculated detection efficiency, detection efficiency=clean revised activity of counting/radioactive source;
(6) according to parameter--the minimum detectable lower limit MDA of following formula computational representation static sensitivity,
Wherein, BN is sample-out count mean value, and T is Measuring Time, and ρ is detection efficiency.
5. gate-type radiation monitor static sensitivity detection method as claimed in claim 4, it is characterized in that: the method also comprises the steps:
(7) change the radioactive source of different activity, perhaps change the Measuring Time T of gate-type radiation monitor, perhaps change the distance between the detector sensitive center of radioactive source and gate-type radiation monitor, repeating step (one) determines that to step (sixs') operation minimum detectable lower limit MDA is with the impact of different factors vary.
6. a right to use requires that described in 1, equipment to the method that gate-type radiation monitor false alarm rate detects, comprises the steps:
(I) is placed on checkout equipment between two detectors of gate-type radiation monitor, select suitable radioactive source to be placed in the radiation source capsule of checkout equipment, and radioactive source is placed in vitriol chamber, the distance between the detector sensitive center of radioactive source and gate-type radiation monitor is set simultaneously;
(II) is in the measuring period of the gate-type radiation monitor of 70 seconds, wherein be used for sample-out count in 60 seconds, upgrade background, trigger the gate-type radiation monitor in 10 seconds and enter measuring state, in 10 seconds measure, the radioactive source of checkout equipment is risen from vitriol chamber, acting in conjunction by position detector and rectilinear motion controller, complete irradiation in a time 1 second, and make radioactive source return to vitriol chamber, the exposure period of 1 second is by regulating the rotating speed of Frequency Converter Control deceleration linear electric motors, and then controls that the rising or falling speed of radioactive source guarantees; Perhaps, in 10 seconds measured, radioactive source did not rise, and completes 1 passive irradiation;
(III) is recorded in the gate-type radiation monitor in N measuring period, and radioactive source rises the times N of completing active irradiation
1, during active irradiation, the gate-type radiation monitor does not have the times N of warning
2, and radioactive source is retained in vitriol chamber, do not rise, complete the times N of passive irradiation
3, during passive irradiation, the times N of warning occurs in the gate-type radiation monitor
4Wherein, N=N
1+ N
3
(IV) calculates false alarm rate=(N
2+ N
4)/(N
1+ N
3).
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| CN102087364B true CN102087364B (en) | 2013-06-19 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087365B (en) * | 2009-12-04 | 2013-05-01 | 中国辐射防护研究院 | Device and method for calibrating and detecting dynamic sensitivity of gate-type radiation monitor |
| CN103454666B (en) * | 2012-05-30 | 2016-08-24 | 中国辐射防护研究院 | Dosimeter panoramic exposure calibrating installation |
| CN104637563A (en) * | 2013-11-11 | 2015-05-20 | 中国辐射防护研究院 | Safety operation method of attenuation type automatic multi-range gamma irradiation device |
| CN104360368B (en) * | 2014-12-04 | 2018-08-24 | 江苏超敏科技有限公司 | The data processing method of pulse signal in a kind of alarm to personal dose |
| CN104570044B (en) * | 2014-12-10 | 2017-05-03 | 北京永新医疗设备有限公司 | Real-time detecting system and method for radioactive materials carried by personnel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1133440A (en) * | 1995-03-31 | 1996-10-16 | 清华大学 | Self-scan type radiation detection system for large body |
| CN101158722A (en) * | 2006-02-10 | 2008-04-09 | 中国人民解放军63960部队 | Personal dose-meter calibrating panorama irradiation device |
| JP2009270992A (en) * | 2008-05-09 | 2009-11-19 | Tokyo Energy & Systems Inc | Radiographic testing device |
-
2009
- 2009-12-04 CN CN 200910242084 patent/CN102087364B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1133440A (en) * | 1995-03-31 | 1996-10-16 | 清华大学 | Self-scan type radiation detection system for large body |
| CN101158722A (en) * | 2006-02-10 | 2008-04-09 | 中国人民解放军63960部队 | Personal dose-meter calibrating panorama irradiation device |
| JP2009270992A (en) * | 2008-05-09 | 2009-11-19 | Tokyo Energy & Systems Inc | Radiographic testing device |
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