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Delivery: <= 6 days. True-PDF full-copy in English will be manually translated and delivered via email. JJF 1248-2020: Calibration Specification for Channel Vehicle Radioactivity Monitoring Systems Status: Valid JJF 1248: Historical versions
Basic dataStandard ID: JJF 1248-2020 (JJF1248-2020)Description (Translated English): Calibration Specification for Channel Vehicle Radioactivity Monitoring Systems Sector / Industry: Metrology & Measurement Industry Standard Classification of Chinese Standard: A58 Word Count Estimation: 33,361 Date of Issue: 2020-07-02 Date of Implementation: 2021-01-02 Older Standard (superseded by this standard): JJF 1248-2010 Regulation (derived from): Announcement No. 29 (2020) of the State Administration for Market Regulation Issuing agency(ies): State Administration for Market Regulation JJF 1248-2020: Calibration Specification for Channel Vehicle Radioactivity Monitoring Systems---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Calibration Specification for Channel Vehicle Radioactivity Monitoring Systems National Metrology Technical Specifications of the People's Republic of China Channel type vehicle radioactivity monitoring system Calibration specification 2020-07-02 released 2021-01-02 implementation Issued by the State Administration for Market Regulation Channel type vehicle radioactivity monitoring System calibration specification Replace JJF 1248-2010 Focal point. National Technical Committee on Measurement of Ionizing Radiation Drafting unit. Shanghai Institute of Metrology and Testing Technology China Testing Technology Research Institute This specification entrusts the National Technical Committee for Ionizing Radiation Measurement to be responsible for the interpretation Drafters of this specification. Linfeng He (Shanghai Institute of Metrology and Testing Technology) Lu Xiaojun (Shanghai Institute of Metrology and Testing Technology) Su Jie (China Testing Technology Research Institute) Tang Fangdong (Shanghai Institute of Metrology and Testing Technology) Yang Yong (China Testing Technology Research Institute) table of ContentsIntroduction (Ⅱ) 1 Scope (1) 2 Reference documents (1) 3 Terms and units of measurement (1) 3.1 Term (1) 3.2 Unit of measurement (2) 4 Overview (2) 5 Measurement characteristics (2) 5.1 Activity response (2) 5.2 Neutron response (2) 5.3 Nuclide recognition rate (2) 6 Calibration conditions (2) 6.1 Environmental conditions (2) 6.2 Measurement standards (3) 7 Calibration items and calibration methods (3) 7.1 Non-nuclide identification channel type vehicle radioactivity monitoring system (3) 7.1.1 Activity response (3) 7.1.2 The response of the detector to different energy gamma radionuclides (3) 7.1.3 Neutron response (4) 7.1.4 Repeatability (4) 7.1.5 Non-linear activity response (4) 7.1.6 Dynamic detection(5) 7.2 Radioactive monitoring system for radioactive detection type vehicles (5) 7.2.1 Activity response (5) 7.2.2 Neutron response(5) 7.2.3 Repeatability (5) 7.2.4 Nuclide recognition in static mode (5) 7.2.5 Dynamic detection(6) 8 Presentation of calibration results (6) 9 Recalibration interval (6) Appendix A. Schematic diagram of the detection area and nuclide identification test point of the channel-type vehicle radioactivity monitoring system (7) Appendix B Recommended format for calibration record of channel-type vehicle radioactivity monitoring system (8) Appendix C Contents of the inside page of the calibration certificate of the channel-type vehicle radioactivity monitoring system (non-nuclide identification type) (17) Appendix D Contents of the inside page of the calibration certificate of the channel-type vehicle radioactivity monitoring system (nuclide identification type) (19) Appendix E Example of measurement uncertainty evaluation of activity response (21) Appendix F Measurement Uncertainty Evaluation Example of Neutron Response (25)IntroductionJJF 1071 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1001 "General Metrology Terms and Definitions", JJF 1059.1 "Evaluation and Expression of Measurement Uncertainty" together constitutes a basic series to support the revision of this code specification. The revision of this code is based on GB/T 24246-2009 "Radioactive Material and Special Nuclear Material Monitoring System", GB/T 31836-2015/IEC 62484.2010 "Radiation protection instruments used to detect and identify illegal radioactive substances Spectral analysis-based portal monitoring system for transportation", IEC 62244 "National border radioactive and special nuclear material detection "Radiation Protection Monitor" is the main technical reference. Compared with JJF 1248-2010, except for editorial changes, the main technical changes of this specification are as follows. ---In the scope of application, the channel type vehicle radioactivity monitoring system is classified, and the nuclide recognition type and neutron are added. Vehicle radioactivity monitoring system with radiation detection function; --- Modify the original specification term "average activity response" to "activity response"; --- Delete the original standard term "radionuclide activity detection threshold" and "effective detection area", add the term "nuclear Element recognition rate"; ---Add "Neutron Response" and "Nuclide Recognition Rate" in the measurement characteristics; ---In the measurement standard, 133Ba and 226Ra nuclides are added to the gamma radioactive reference source, and the neutron reference source is added; --- Delete the original standard calibration items "Radionuclide Detection Threshold" and "Effective Detection Area"; ---Add the calibration item "Neutron Response"; ---Modified the calculation formula of "missing alarm rate" in dynamic detection and the number of detections, and increased the neutron radiation dynamics State detection content; ---Increase the calibration items and calibration methods of the radioactive monitoring system of the radioactive detection type channel type vehicle. The previous releases of this specification are as follows. ---JJF 1248-2010. Calibration specification for channel type vehicle radioactivity monitoring system1 ScopeThis specification applies to gamma radiation with a photon energy above 40keV, thermal neutrons ~20MeV neutron radiation Radiation channel type vehicle radioactivity monitoring system, including nuclide identification type and non-nuclide identification type. Channel-type vehicle radioactivity monitoring system using a single detector and channel-type vehicle with detectors distributed on one side For the radioactivity monitoring system, refer to the calibration method specified in this specification.2 Reference documentsThis specification refers to the following documents. JJF 1001-2011 General measurement terms and definitions GB/T 24246-2009 Radioactive Material and Special Nuclear Material Monitoring System GB/T 31836-2015/IEC 62484.2010 Radiation protection equipment is used to detect and identify illegal radiation Spectral analysis-based portal monitoring system for the transportation of sexual substances IEC 62244 Radiation protection monitor (Radiationpro- tectioninstrumentation-Instaledradiationmonitorsforthedetectionofradioactiveand specialnuclearmaterialsatnationalborders) One of the IAEA nuclear safety series, part 4.3.2 of the technical specifications for border monitoring equipment (published in Austria, 2006.3) [IAEANuclearSecuritySeriesNo.1(PrintedbyIAEAinAustria,March 2006)TechnicalandFunctionalSpecificationsforBorderMonitoringEquipment,Part 4.3.2] For dated reference documents, only the dated version applies to this specification; for all undated references The latest version (including all modified units) is applicable to this specification.3 Terms and units of measurement3.1 Terminology JJF 1001-2011, GB/T 24246-2009, GB/T 31836-2015 and the following terms and definitions The meaning applies to this specification. 3.1.1 backgroundcountrate Detected by the channel-type vehicle radioactivity monitoring system per unit time due to cosmic rays and natural radioactivity in the environment Count caused by the existence of. 3.1.2 Activity response activityresponse The response of the detector to the gamma radionuclide activity at the reference measurement point. The activity response of each detector within the measurement range The sum is the activity response of the channel-type vehicle radioactivity monitoring system. 3.1.3 Activity response non-linearofactivityresponse In the measurement range, the relative deviation between the activity response of the detector and the average value of the activity response. Non-linearity of the usual instrument ...... |
