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JJG 2044-2019: Metrological Instruments for Air Kerma of γ Rays
Status: Valid JJG 2044: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 2044-2019 | English | 209 |
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3 days [Need to translate]
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Metrological Instruments for Air Kerma of γ Rays
| Valid |
JJG 2044-2019
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| JJG 2044-2010 | English | 399 |
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3 days [Need to translate]
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Verification scheme of metrological instruments for air kerma of γ rays
| Obsolete |
JJG 2044-2010
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| JJG 2044-1989 | English | 199 |
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2 days [Need to translate]
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Verification Scheme of Measuring Instruments for γ-Ray Exposure
| Obsolete |
JJG 2044-1989
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PDF similar to JJG 2044-2019
Basic data | Standard ID | JJG 2044-2019 (JJG2044-2019) | | Description (Translated English) | Metrological Instruments for Air Kerma of �� Rays | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A58 | | Classification of International Standard | 17.240 | | Word Count Estimation | 9,939 | | Date of Issue | 2019 | | Date of Implementation | 2020-03-27 | | Issuing agency(ies) | State Administration for Market Regulation | JJG 2044-2019: Metrological Instruments for Air Kerma of γ Rays---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.
(γ-ray air specific release kinetic energy measuring instrument verification system table)
Table of National Metrology Verification System of the People's Republic of China
γ-ray air specific release kinetic energy measuring instrument
2019-09-27 release
2020-03-27 Implementation
Issued by the State Administration of Market Supervision and Administration
γ-ray air specific release kinetic energy measurement
Apparatus verification system table
Replace JJG 2044-2010
Centralized unit. National Technical Committee on Ionizing Radiation Measurement
Drafting unit. Chinese Academy of Metrology
This verification system table entrusts the National Ionizing Radiation Measurement Technical Committee to interpret
The main drafters of this verification system table.
Li Dehong (Chinese Academy of Metrology)
Wang Kun (Chinese Academy of Metrology)
Participating drafters.
Yang Xiaoyuan (Chinese Academy of Metrology)
Huang Jianwei (Chinese Academy of Metrology)
Ye Yibo (Chinese Academy of Metrology)
table of Contents
Introduction (Ⅱ)
1 Scope (1)
2 Measurement standards (1)
2.1 γ-ray air specific release kinetic energy benchmark (1)
2.2 γ-ray reference radiation (1)
3 Measurement standards (2)
3.1 Standard device for therapeutic level gamma rays (2)
3.2 Protection level γ-ray standard device (2)
3.3 Environmental level gamma-ray standard device (2)
4 Working measuring instruments (3)
4.1 Therapeutic level dosimeter (3)
4.2 Protection level dose meter (3)
4.3 Environmental level dosimeter (3)
4.4 Medical treatment radiation source (3)
4.5 Measuring instruments using radioactive sources (3)
4.6 γ-ray flaw detector (3)
5 γ-ray air specific release kinetic energy measuring instrument verification system table block diagram (3)
Introduction
This verification system table is prepared according to JJF1104-2003 "Rules for Compiling National Measurement Verification System Table".
This verification system table replaces JJG 2044-2010 "γ-ray air specific release kinetic energy measuring instrument", the main technical changes
It is as follows.
--- Added the expression of 137Cs γ-ray air specific release kinetic energy benchmark, the dose rate range is (1 × 10-3 ~ 10)
Gy/h.
The previous releases of this verification system table are.
--- JJG 2044-2010;
--- JJG 2044-1989.
γ-ray air specific release kinetic energy measuring instrument verification system table
1 Scope
This verification system is suitable for the treatment level, protection level and environmental level γ-ray air specific release kinetic energy measuring instruments
The value is passed. The verification system of γ-ray air specific release kinetic energy measuring instruments consists of measuring reference instruments, measuring standard instruments and tools
As a measuring instrument composition, the composition and main measuring performance of the γ-ray air specific release kinetic energy standard are specified.
A procedure for carrying out the transfer of measurement values from measuring standard instruments to working measurement instruments, indicating the best measurement for the transmission of measurement values
Ability and value transfer methods. In the process of carrying out the γ-ray air specific release kinetic energy calibration project, this verification system can be used as
The basis for the traceability of the value.
2 Measurement basis
γ-ray air specific release kinetic energy measurement reference instrument is used to reproduce and preserve the amount of γ-ray air specific release kinetic energy (Gy)
Value, through the γ-ray reference radiation to the measurement standard equipment, working measurement equipment to transfer the value.
2.1 γ-ray air specific release kinetic energy benchmark
The γ-ray air kerma reference group consists of 137Cs γ-ray air kerma reference and 60Co γ-ray air kerma
The kinetic energy reference composition, which reproduces the air specific kinetic energy value in the γ-ray reference radiation field.
2.1.1 The 137Cs γ-ray air specific kinetic energy reference consists of a graphite cavity ionization chamber group and an ionization current measurement system.
The graphite cavity ionization chamber group consists of a graphite cavity ionization chamber with an effective collection volume of (5 ~ 50) cm3; ionization current measurement
The measuring system is composed of digital source meter, standard capacitance, electrometer and so on. 137Cs γ-ray air specific release kinetic energy reference measurement range
The range is (1 × 10-3 ~ 10) Gy/h, and the extended uncertainty range is 0.50% ~ 0.70% (k = 2).
2.1.2 The 60Co gamma ray air specific release kinetic energy reference consists of a graphite cavity ionization chamber and an ionization current measurement system. stone
The ink cavity ionization chamber group consists of a graphite cavity ionization chamber with an effective collection volume of (2 ~ 10) cm3; ionization current measurement
The system consists of digital source meter, standard capacitance, electrometer, etc. Measurement range of 60Co gamma ray air specific release kinetic energy reference
It is (1 × 10-2 ~ 1) Gy/min, and the extended uncertainty range is 0.54% (k = 2).
2.2 Reference radiation of gamma rays
γ-ray reference radiation is mainly composed of the reference radiation field of 60Co or 137Cs radioactive source.
The quasi-through γ-ray reference radiation should be used to carry out the value transmission to the standard equipment of the treatment level and the protection level, respectively. quasi-
Straight beam reference radiation field includes irradiator, lead container, shutter, guide rail positioning system and detector alignment positioning system group
The source can be included in the irradiator. The freely diverging reference radiation field consists of the radioactive source and the source holder, the guide rail positioning system and
The detector is composed of a positioning system, and the radiation source must meet the requirements of a point source.
2.2.1 γ-ray reference radiation needs to meet the requirements for the reproducibility and value transfer of the air specific release kinetic energy reference value.
Straight design, in the open source state, the share of scattered ray fluence in the uniform area at a distance of 100 cm from the source is not greater than 30%, and the uniformity is not small
In 99% of the area, the cross section completely covers the detector to be tested, and the radiation field is not less than the vertical beam direction of the detector
2 times the outer diameter of the cross-section, the dose contribution of scattered radiation outside the radiation source at different distances does not exceed the total air kerma
3%.
2.2.2 Dose rate range of γ-ray reference radiation. The therapeutic level air specific release kinetic energy rate is about (1 × 10-2 ~ 10)
Gy/min, the protective level air specific release kinetic energy rate is about (1 × 10-3 ~ 10) Gy/h.
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