CN116299642A - Method for checking radioactive source period of radioactive environment laboratory - Google Patents
Method for checking radioactive source period of radioactive environment laboratory Download PDFInfo
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- CN116299642A CN116299642A CN202111564283.9A CN202111564283A CN116299642A CN 116299642 A CN116299642 A CN 116299642A CN 202111564283 A CN202111564283 A CN 202111564283A CN 116299642 A CN116299642 A CN 116299642A
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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
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Abstract
The invention relates to the technical field of radiation environment monitoring, and particularly discloses a method for checking a radioactive source period in a radioactive environment laboratory, which comprises the following steps of: step 1: checking the appearance of the radioactive source, judging whether the radioactive source is damaged, if so, judging that the radioactive source is not checked and scrapped; if the appearance is complete, the next step is carried out; step 2: using a radiation detector to measure the activity of the radioactive source, and comparing the measurement result with the activity of the last verification certificate after decay correction; if the result is satisfied, checking the radioactive source period; if the result is not satisfied, the third-party calibration mechanism calibration is conducted again. The method can lead the radioactive source to be in a controlled state and ensure the accuracy of the detection result.
Description
Technical Field
The invention belongs to the technical field of radiation environment monitoring, and particularly relates to a method for checking a radioactive source period in a radioactive environment laboratory.
Background
A radioactive source is a material or substance commonly used in radioactive environment laboratories to perform calibration measurement device configuration, evaluation measurements. Thus, the controlled state of the radiation source is crucial for the quality of operation of the environmental monitoring laboratory.
According to CNAS-CL01:2018 general requirements for detection and calibration laboratory capabilities 6.4.10 should be checked programmatically when needed to keep confidence in device performance with period checks. The period check refers to the operation of the device during use or between two adjacent calibrations to verify whether its function or metering characteristics can continuously meet the method requirements or the specified requirements according to the specified program.
Since radiation measurement devices in a radioactive environment laboratory need to be calibrated using a radioactive source, and the radioactive source is always in the decay process, the continuous decrease of the activity is difficult to meet the guarantee of the stability of the standard substance in the above standard, and no standard method is currently provided for laboratory period verification about the radioactive source.
According to document 1[ Huang Cheng, lu Liming, liu Guo ] application of conventional control charts in standard substance period checking [ J ] profession and health, 2008,24 (18): 1893-1895] this laboratory uses a long-term quality control chart for period checking of standard substances, which requires long-term accumulated data, and the time interval for two calibration of a general standard substance is two years, so that the period checking is also carried out once for two years, which is disadvantageous in data acquisition, which would lead to difficulty in verifying the stability of the standard substance.
Document 2[ Zhang Hong ] checking [ J ] resource savings and environmental protection during environmental laboratory standards, 2015 (12): 115 ] optionally sent to a qualified calibration facility or inter-laboratory sample comparison to determine the stability of the standard. The method is difficult to implement, the meaning of laboratory internal control is lost in external calibration, the workload and the laboratory expense are increased, the comparison uncertainty among external laboratories is large, and besides the difference among standard substances, the method is also related to large errors caused by reasons of measuring equipment, personnel, weighing tools and the like.
In view of the above, there is a need to devise a method for verification during radioactive sources in a radioactive environment laboratory.
Disclosure of Invention
The invention aims to provide a method for checking during radioactive source in a radioactive environment laboratory, so as to solve the problem that the radioactive environment laboratory has no applicable method for controlling the stability of the radioactive source.
The technical scheme of the invention is as follows:
a method for verification during radioactive sources in a radioactive environment laboratory, comprising the steps of:
step 1: inspection of the appearance of a radioactive source
Checking the appearance of the radioactive source, judging whether the radioactive source is damaged, if so, judging that the radioactive source is not checked and scrapped; if the appearance is complete, the next step is carried out;
step 2: measurement determination
Using a radiation detector to measure the activity of the radioactive source, and comparing the measurement result with the activity of the last verification certificate after decay correction;
if the result is satisfied, checking the radioactive source period;
if the result is not satisfied, the third-party calibration mechanism calibration is conducted again.
In step 2, the result determination is performed by calculating the En value:
wherein:
en: a result determination value;
x: an activity measurement of the source;
x: calibration certificate activity after source decay correction;
U x : measurement value expansion uncertainty;
U X : decay correction assay value expansion uncertainty;
if the En is less than or equal to 1, the result is satisfactory, and the period of the radioactive source passes the check; if the En is more than 1, the result is unsatisfactory, and the third-party calibration mechanism is carried out again.
The calibration certificate activity X after source decay correction is obtained by calculation according to the method of evaluating the consistency of two data in the statistical processing and the capability evaluation guide of the capability verification result of CNAS-GL 002-2018.
Said U x The factor k=2 is included and is given directly by the measuring instrument.
Said U X Contains a factor k=2, given by the source certificate.
The radiation detector is a high-purity germanium gamma spectrometer.
In step 2, a radioactive source is placed on a source support of a high-purity germanium gamma spectrometer probe, measurement time of measurement software is set, and spectrum analysis is carried out to obtain a radioactive source activity measurement value x.
The invention has the remarkable effects that:
(1) The method of the invention provides a method for checking during radioactive source period in the field of radioactive environment laboratory.
(2) Compared with a quality control diagram method and an inter-laboratory comparison method, the method has higher operability and accuracy.
(3) The method can lead the radioactive source to be in a controlled state and ensure the accuracy of the detection result.
Therefore, the method has wide application value on the quality control and management of the radioactive source in the radioactive environment laboratory, and is worth popularizing.
Drawings
Fig. 1 is a flow chart of an embodiment.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
A method for verification during radioactive sources in a radioactive environment laboratory, comprising the steps of:
step 1: inspection of the appearance of a radioactive source
Checking the appearance of the radioactive source, judging whether the radioactive source is damaged, if so, judging that the radioactive source is not checked and scrapped; if the appearance is complete, the next step is carried out;
step 2: measurement determination
Using a radiation detector to measure the activity of the radioactive source, comparing the measurement result with the activity of the calibration certificate after decay correction, and calculating an En value:
wherein:
en: a result determination value;
x: an activity measurement of the source;
x: the activity of the calibration certificate after the source decay correction is calculated according to the method of evaluating the consistency of two data in the statistical processing and the capability evaluation guideline of the capability verification result of CNAS-GL 002-2018;
U x : the measurement value expansion uncertainty, comprising a factor k=2, is directly given by the measuring instrument;
U X : the decay correction check value extends the uncertainty, including a factor k=2, given by the source certificate;
if the En is less than or equal to 1, the result is satisfactory, and the period of the radioactive source passes the check;
if the En is more than 1, the result is unsatisfactory, and the third-party calibration mechanism is carried out again.
Examples
A method for verification during a radioactive source in a radioactive environment laboratory as shown in fig. 1, comprising the steps of:
step 1: inspection of 60 The appearance of the Co standard point source is complete and has no damage;
step 2: will be 60 The Co standard point source is arranged on a source support of 25cm of a high-purity germanium gamma spectrometer probe, the measurement time of measurement software is set to be 500s, the spectrum analysis is carried out, the radioactive source activity measurement value x= 53440 is obtained, and the measurement relative uncertainty (k=2) U is measured x ＝787.02；
Relative uncertainty (k=2) U, with the decay corrected source activity x= 52468 in the source calibration certificate X Comparison is performed, calculated En value = 1603.2:
the result is satisfactory that the verification passes during the radioactive source.
Claims (7)
1. A method for verification during radioactive sources in a radioactive environment laboratory, characterized by: the method comprises the following steps:
step 1: inspection of the appearance of a radioactive source
Checking the appearance of the radioactive source, judging whether the radioactive source is damaged, if so, judging that the radioactive source is not checked and scrapped; if the appearance is complete, the next step is carried out;
step 2: measurement determination
Using a radiation detector to measure the activity of the radioactive source, and comparing the measurement result with the activity of the last verification certificate after decay correction;
if the result is satisfied, checking the radioactive source period;
if the result is not satisfied, the third-party calibration mechanism calibration is conducted again.
2. A method for audit during radioactive sources in a radioactive environment laboratory as set forth in claim 1, wherein: in step 2, the result determination is performed by calculating the En value:
wherein:
en: a result determination value;
x: an activity measurement of the source;
x: calibration certificate activity after source decay correction;
U x : measurement value expansion uncertainty;
U X : decay correction assay value expansion uncertainty;
if the En is less than or equal to 1, the result is satisfactory, and the period of the radioactive source passes the check; if the En is more than 1, the result is unsatisfactory, and the third-party calibration mechanism is carried out again.
3. A method for verification during radioactive sources in a radioactive environment laboratory as set forth in claim 2, wherein: the calibration certificate activity X after source decay correction is obtained by calculation according to the method of evaluating the consistency of two data in the statistical processing and the capability evaluation guide of the capability verification result of CNAS-GL 002-2018.
4. A method for verification during radioactive sources in a radioactive environment laboratory as set forth in claim 2, wherein: said U x The factor k=2 is included and is given directly by the measuring instrument.
5. A method for verification during radioactive sources in a radioactive environment laboratory as set forth in claim 2, wherein: said U X Contains a factor k=2, given by the source certificate.
6. A method for verification during radioactive sources in a radioactive environment laboratory as set forth in claim 2, wherein: the radiation detector is a high-purity germanium gamma spectrometer.
7. A method for audit during radioactive sources in a radioactive environment laboratory as set forth in claim 6, wherein: in step 2, a radioactive source is placed on a source support of a high-purity germanium gamma spectrometer probe, measurement time of measurement software is set, and spectrum analysis is carried out to obtain a radioactive source activity measurement value x.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111564283.9A CN116299642A (en) | 2021-12-20 | 2021-12-20 | Method for checking radioactive source period of radioactive environment laboratory |
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