CN113359178B - Radiometer based on self-adaptive dead time compensation - Google Patents
Radiometer based on self-adaptive dead time compensation Download PDFInfo
- Publication number
- CN113359178B CN113359178B CN202110329952.8A CN202110329952A CN113359178B CN 113359178 B CN113359178 B CN 113359178B CN 202110329952 A CN202110329952 A CN 202110329952A CN 113359178 B CN113359178 B CN 113359178B
- Authority
- CN
- China
- Prior art keywords
- dead time
- time compensation
- rate
- counting
- counting rate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/17—Circuit arrangements not adapted to a particular type of detector
- G01T1/171—Compensation of dead-time counting losses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/18—Measuring radiation intensity with counting-tube arrangements, e.g. with Geiger counters
-
- 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
Abstract
The invention discloses a radiation measuring instrument based on self-adaptive dead time compensation. The radiation measuring instrument corrects the dead time of the system through an adaptive dead time compensation program in the adaptive dead time compensation module, and reduces the sensitivity of a measuring result to the counting rate when the dead time rate is high. The radiation measuring instrument based on the self-adaptive dead time compensation method disclosed by the invention can reduce the measurement error in the high counting rate, further expand the upper limit of the available measurement range and reduce the measurement error of the instrument in the whole measurement range.
Description
Technical Field
The invention belongs to the technical field of radiation measurement, and particularly relates to a radiation measuring instrument based on self-adaptive dead time compensation.
Background
In radiation measurement techniques, dead time is the time during which a radiation detector or measurement system outputs no response to radiation exposure for a period of time after a single signal output when radiation measurements are made by counting. During the dead time, the radiation detector temporarily loses its detection capability and the measurement system cannot produce an output corresponding to the radiation, resulting in a measurement loss. The loss of measurement due to dead time has a very serious impact on the accuracy of measurement at high count rates, and must be compensated for.
The existing radiation measuring instrument or system adopts a classical dead time compensation method, and the dead time rate is generally required to be less than 30 percent, because when the dead time rate is more than 30-40 percent, the real counting rate is very sensitive to the change of the measured counting rate, so that a larger measuring error occurs to a measuring result at a high counting rate, and the upper limit of the measuring range of the radiation measuring instrument is further limited.
Disclosure of Invention
The invention aims to solve the problems of the existing radiometer in dead time compensation, reduce the measurement error of the radiometer at high counting rate and provide a radiometer based on a self-adaptive dead time compensation method. The radiation measuring instrument corrects the dead time of the system through the self-adaptive dead time compensation algorithm program in the self-adaptive dead time compensation module, reduces the sensitivity of the measurement result to the counting rate when the dead time rate is high, thereby reducing the measurement error when the counting rate is high, further expanding the upper limit of the available measurement range and reducing the measurement error of the instrument in the whole measurement range.
A radiation measuring instrument based on self-adaptive dead time compensation comprises a detector, a high voltage generating circuit, a signal conditioning circuit and a data processing unit; the data processing unit comprises a counter, a dead time compensation module and a scale operation module, wherein the counter is used for calculating a counting signal generated in unit time and generating a counting rate, then the counting rate is sent to the dead time compensation module, a dead time compensation algorithm program is preloaded in the dead time compensation module, the counting rate after compensation is obtained through processing of the dead time compensation algorithm program in the dead time compensation module, and a final measuring result is output after the counting rate after compensation passes through the scale operation module;
the dead time compensation algorithm is based on the formula
Compensating for radiometric dead time, where n is the corrected count rate and m isThe counting rate is measured, τ is the dead time of the system, d is the correction factor, d=f (m), f (m) is arbitrarily set to 0<d<1, and when m<s or m>s is a function of making the relative error of the corresponding dose rate measurement smaller than 3%, wherein s is a correction threshold value, 6000 is selected according to the instrument<s<15000; for different radiation measurement systems, the counting rate m is adaptively corrected according to the system dead time tau, so that the radiation measurement dead time is compensated.
The beneficial effects of the invention are as follows: the dead time of the system is corrected by the self-adaptive dead time compensation method, so that the problem that the available measurement range is reduced due to overlarge measurement error when the existing instrument is high in counting rate is solved, the instrument has smaller measurement error in the whole measurement range, and the measurement range of the instrument is expanded.
Drawings
FIG. 1 is a schematic diagram of a radiometer based on adaptive dead time compensation in accordance with the present invention;
fig. 2 is a schematic diagram of a data processing unit according to the present invention.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to specific embodiments.
A radiation measuring instrument based on self-adaptive dead time compensation comprises a detector, a high voltage generating circuit, a signal conditioning circuit and a data processing unit; the data processing unit comprises a counter, a dead time compensation module and a scale operation module, wherein the counter is used for calculating a counting signal generated in unit time and generating a counting rate, then the counting rate is sent to the dead time compensation module, the dead time compensation module is preloaded with a dead time compensation algorithm program, the counting rate after compensation is obtained through processing of the dead time compensation algorithm program in the dead time compensation module, and a final measuring result is output after the counting rate after compensation passes through the scale operation module.
The dead time compensation algorithm is based on the formula
Compensating for radiometric dead time, where n is the corrected count rate and m is the measuredCount rate, τ is system dead time, d is correction factor, d=f (m), f (m) is arbitrarily set to 0<d<1, and when m<s or m>s is a function of making the relative error of the corresponding dose rate measurement smaller than 3%, wherein s is a correction threshold value, 6000 is selected according to the instrument<s<15000; for different radiation measurement systems, the counting rate m is adaptively corrected according to the system dead time tau, so that the radiation measurement dead time is compensated.
As shown in fig. 1, the high voltage generating circuit provides a high voltage bias of about 500V for the detector required by normal operation, the detector acts with the detected rays under the high voltage bias to generate pulse signals, the pulse signals form counting signals with regular shapes through the signal conditioning circuit, and the counting signals are sent to the data processing unit for data processing to give measurement results.
As shown in fig. 2, the data processing unit includes a counter, a dead time compensation module and a scale operation module, the counter calculates a count rate generated by a count signal generated in a unit time, and then the count rate performs dead time compensation to generate a compensated count rate, and the compensated count rate is processed by the scale operation module and then outputs a measurement result.
Example 1
A radiation measuring instrument based on self-adaptive dead time compensation comprises a detector, a high voltage generation circuit, a signal conditioning circuit and a data processing unit; the detector is a ZP1202 type G-M counting tube, the data processing unit comprises a counter, a dead time compensation module and a scale operation module, the counter is used for calculating a counting signal generated in unit time and generating a counting rate, then the counting rate is sent to the dead time compensation module, the dead time compensation module is preloaded with a dead time compensation algorithm program, the counting rate after compensation is obtained through processing of the dead time compensation algorithm program in the dead time compensation module, and a final measuring result is output after the counting rate after compensation passes through the scale operation module.
The dead time compensation algorithm is based on the formula
Compensating for radiometric dead time, whereinN is the correction count rate, m is the measured count rate, τ is the system dead time, d is the correction factor, d=2 -0.0002145m . The measurement results of the radiometer based on the adaptive dead time compensation method disclosed in the patent are shown in table 1.
Table 1 the invention discloses the measurement results of radiometer
In order to compare the testing effect of the radiometer disclosed by the invention, a ZP1202 type G-M counting tube is also adopted as a detector, and the measuring result of the meter for data processing by adopting the conventional classical dead time compensation method is shown in Table 2. The sensitivity of the ZP1202 type G-M counter tube measurement k=1.67 cps/. Mu.sv/h, dead time τ= 0.000065s.
Table 2 existing meter measurements
As can be seen from tables 1 and 2, in table 1, the relative error of the measurement result is only 1.20% when the dose rate convention true value is 28230 μsv/h by adopting the radiometer based on adaptive dead time compensation disclosed in the patent; when the true value of the dose rate convention is 60000 mu Sv/h, the relative error is only 3.48%; in Table 2, the relative error corrected by the existing dead time compensation method reaches 49.89% when the true value of the dose rate is 28230 mu Sv/h, and reaches 1988.86% when the true value of the dose rate is 60000 mu Sv/h, and is severely distorted.
The comparison measurement result shows that the measurement result of the self-adaptive dead time compensation-based radiometer disclosed by the invention is obviously superior to the measurement result of the traditional meter which adopts a classical dead time compensation method for data processing. Therefore, the existing radiation measuring instrument adopting the classical dead time compensation method has large measuring error under the high dose rate, and limits the available measuring range of the instrument; the radiation measuring instrument based on the self-adaptive dead time compensation method has small measuring error, and simultaneously, the available measuring range of the instrument is expanded.
Claims (1)
1. The utility model provides a radiometer based on self-adaptation dead time compensation, includes detector, high voltage generation circuit, signal conditioning circuit and data processing unit, its characterized in that: the data processing unit comprises a counter, a dead time compensation module and a scale operation module, wherein the counter is used for calculating a counting signal generated in unit time and generating a counting rate, then the counting rate is sent to the dead time compensation module, a dead time compensation algorithm program is preloaded in the dead time compensation module, the counting rate after compensation is obtained through processing of the dead time compensation algorithm in the dead time compensation module, and a final measuring result is output after the counting rate after compensation passes through the scale operation module;
the dead time compensation algorithm is based on the formula
Compensating for radiometric dead time, where n is the corrected count rate, m is the measured count rate, τ is the system dead time, d is the correction factor, and d=f (m), f (m) is arbitrarily set to 0<d<1, and when m<s or m>s is a function of making the relative error of the corresponding dose rate measurement smaller than 3%, wherein s is a correction threshold value, 6000 is selected according to the instrument<s<15000; for different radiation measurement systems, the counting rate m is adaptively corrected according to the system dead time tau, so that the radiation measurement dead time is compensated. />
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110329952.8A CN113359178B (en) | 2021-03-29 | 2021-03-29 | Radiometer based on self-adaptive dead time compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110329952.8A CN113359178B (en) | 2021-03-29 | 2021-03-29 | Radiometer based on self-adaptive dead time compensation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113359178A CN113359178A (en) | 2021-09-07 |
| CN113359178B true CN113359178B (en) | 2023-05-16 |
Family
ID=77525089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110329952.8A Active CN113359178B (en) | 2021-03-29 | 2021-03-29 | Radiometer based on self-adaptive dead time compensation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113359178B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3145295A1 (en) * | 1980-11-17 | 1982-06-16 | Junta de Energia Nuclear, Madrid | DEAD-TIME COMPENSATED PROBE WITH A GEIGER-MUELLER HALOGEN COUNTER TUBE FOR DETECTING GAMMA RADIATION |
| CA1130478A (en) * | 1980-03-06 | 1982-08-24 | Philip C. East | Dead time compensation circuit |
| JP2004125639A (en) * | 2002-10-03 | 2004-04-22 | Japan Atom Energy Res Inst | Method for correcting dead time of detector in new microanalysis method having integrated multiple gamma ray detection method and radioactivation analysis |
| CN101082674A (en) * | 2007-07-19 | 2007-12-05 | 清华大学 | Method for eliminating counting loss of dose equivalent instrument around neutron |
| CN101983332A (en) * | 2008-03-31 | 2011-03-02 | 南方创新国际股份有限公司 | Screening method and apparatus |
| CN105190357A (en) * | 2013-05-08 | 2015-12-23 | 皇家飞利浦有限公司 | Apparatus and method for the evaluation of gamma radiation events |
| CN106249272A (en) * | 2016-10-18 | 2016-12-21 | 山西中辐核仪器有限责任公司 | A kind of device collecting plastic scintillant fluorescent photon |
| JP2017058162A (en) * | 2015-09-14 | 2017-03-23 | 株式会社東芝 | Radioactive ray measurement device, radioactive ray measurement method and computation device |
| CN106873019A (en) * | 2017-01-06 | 2017-06-20 | 中国科学院高能物理研究所 | A kind of radiation dose measurement method |
| CN107110983A (en) * | 2014-12-15 | 2017-08-29 | 皇家飞利浦有限公司 | Coincidence correction based on pixel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10168435B2 (en) * | 2016-02-26 | 2019-01-01 | Thermo Eberline Llc | Dead-time correction system and method |
-
2021
- 2021-03-29 CN CN202110329952.8A patent/CN113359178B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1130478A (en) * | 1980-03-06 | 1982-08-24 | Philip C. East | Dead time compensation circuit |
| DE3145295A1 (en) * | 1980-11-17 | 1982-06-16 | Junta de Energia Nuclear, Madrid | DEAD-TIME COMPENSATED PROBE WITH A GEIGER-MUELLER HALOGEN COUNTER TUBE FOR DETECTING GAMMA RADIATION |
| JP2004125639A (en) * | 2002-10-03 | 2004-04-22 | Japan Atom Energy Res Inst | Method for correcting dead time of detector in new microanalysis method having integrated multiple gamma ray detection method and radioactivation analysis |
| CN101082674A (en) * | 2007-07-19 | 2007-12-05 | 清华大学 | Method for eliminating counting loss of dose equivalent instrument around neutron |
| CN101983332A (en) * | 2008-03-31 | 2011-03-02 | 南方创新国际股份有限公司 | Screening method and apparatus |
| CN105190357A (en) * | 2013-05-08 | 2015-12-23 | 皇家飞利浦有限公司 | Apparatus and method for the evaluation of gamma radiation events |
| CN107110983A (en) * | 2014-12-15 | 2017-08-29 | 皇家飞利浦有限公司 | Coincidence correction based on pixel |
| JP2017058162A (en) * | 2015-09-14 | 2017-03-23 | 株式会社東芝 | Radioactive ray measurement device, radioactive ray measurement method and computation device |
| CN106249272A (en) * | 2016-10-18 | 2016-12-21 | 山西中辐核仪器有限责任公司 | A kind of device collecting plastic scintillant fluorescent photon |
| CN106873019A (en) * | 2017-01-06 | 2017-06-20 | 中国科学院高能物理研究所 | A kind of radiation dose measurement method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113359178A (en) | 2021-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111554419B (en) | Nuclear reactor subcritical degree measuring method based on uncertainty analysis | |
| JPS5882173A (en) | Method of correcting gamma camera and gamma camera with its correcting device | |
| US10004132B2 (en) | Dose rate monitoring device | |
| CN109215822B (en) | Rod drop reactivity measurement method | |
| CN109799541A (en) | A kind of measurement spectrum drift of gamma spectrum and integral nonlinearity bearing calibration | |
| CN113359178B (en) | Radiometer based on self-adaptive dead time compensation | |
| US9116245B2 (en) | Dose rate measurement system | |
| US9494695B2 (en) | Radiation monitor | |
| US5345082A (en) | Scintillation camera utilizing energy dependent linearity correction | |
| WO2018186155A1 (en) | Neutron intensity monitoring system and method | |
| CN117171516B (en) | Data optimization correction method for X-ray thickness gauge | |
| CN103984004B (en) | A kind of method of automatic elimination PIPS alpha energy spectrum peak temperature drift and device | |
| US4973913A (en) | Radiation measuring apparatus | |
| JP3153484B2 (en) | Environmental radiation monitor | |
| CN104382611A (en) | Correction method and device of output energy of photomultiplier | |
| CN109581468B (en) | Method for identifying weak gamma radioactive source under environmental background | |
| CN109323975B (en) | OPC (optical proximity correction) counting correction method based on echo threshold comparison | |
| CN112967825A (en) | Reactivity measurement method based on correction signal uncertainty analysis | |
| CN113192659B (en) | Nuclear reactor reactivity measurement method based on primary neutron signal average sampling | |
| CN115144889A (en) | Dead time compensation method for self-adaptive radiometry | |
| CN210294543U (en) | SiPM-based digital radiation detection module | |
| US9702987B2 (en) | Neutron measurement apparatus, neutron calculation apparatus, and neutron measurement method | |
| CN112073035A (en) | Self-adaptive filtering method for PSD (phase-sensitive Detector) signals | |
| CN105520738A (en) | Finger force harmony test analysis instrument based on crossed quantitative recursive computation | |
| CN113161028B (en) | Reactivity measurement method based on correction signal optimization processing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |