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GB/T 45608-2025Gas-filled ionization chamber for X and gamma-ray (English PDF)

X、γ射线充气电离室

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

April 25, 2025

Implementation date

November 1, 2025

Scope

GB/T 45608-2025 is the English-translated version of X、γ射线充气电离室.

GB/T 45608-2025 is the Chinese national standard covering the sealed gas chamber that measures X and gamma radiation for protection and environmental monitoring — the categories, the insulation resistance and the plateau slope that shows the chamber is collecting all the charge and not multiplying it, the sensitivity, the energy and angular response, the statistical fluctuation and the response time, the relative intrinsic error, and the environmental and electromagnetic adaptability. First edition, in force from 1 November 2025. Issued on 25 April 2025, it has been in force since 1 November 2025.

Document preview — GB/T 45608-2025

National Standard of the People's Republic of China

ICS: 27.120
Classification: F 88

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

PrefaceIII
1 Scope1
2 Normative references1
3 Terms and Definitions1
4 Categories2
5 Technical Requirements2
5.1 Appearance2
5.2 Insulation resistance2
5.3 Ping Slope3
5.4 Sensitivity3
5.5 Energy Response3
5.6 Angular response3
5.7 Statistical Fluctuations3
5.8 Response Time4
5.9 Relative inherent error4
5.10 Environmental adaptability4
6 Test methods6
6.1 Reference conditions and standard test conditions6
6.2 Test equipment6
6.3 Appearance7
6.4 Insulation resistance7
6.5 pings7
6.6 Sensitivity7
6.7 Energy Response8
6.8 Angular response8
6.9 Statistical Fluctuations8
6.10 Response Time9
6.11 Relative intrinsic error9
6.12 Environmental adaptability10
7 Inspection Rules10
7.1 Inspection categories10
7.2 Implementation and requirements of inspection10
7.3 Inspection Items11
8 Packaging, transportation, storage, labeling12
8.1 Packaging12
8.2 Transportation1212
8.3 Storage12
8.4 Sign12
Appendix A (Normative) Flat slope test method13
Appendix B (Informative) Angular Response Test Ionization Chamber Rotation Example15
Reference17

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document was proposed and coordinated by the National Technical Committee for Standardization of Nuclear Instruments (SAC/TC30).

This document was drafted by: China Shipbuilding Industry Corporation 719 Research Institute, China Institute of Radiation Protection, State Power Investment Corporation Nuclear Energy Co., Ltd.

Company, China Academy of Engineering Physics Materials Research Institute, China Nuclear Control System Engineering Co., Ltd., Xi'an China Nuclear Nuclear Instrument Co., Ltd., CSSC Nuclear Power Technology Co., Ltd. (Wuhan) The main drafters of this document are: Zuo Liangzhou, Qiu Shunli, Dai Chuanbo, Chen Xianglei, Liu Haifeng, Cao Qinjian, Li Jianwei, Wu Fang, Wu Hao, Li Yingnan, Han Jiaxing, Li Shicheng, Deng Peng, Xie Xuetao, Tang Lianhua, Hua Feng, Li Mingxu, Lin Changyong, Shi Li.

X-ray and gamma-ray gas-filled ionization chambers

1 Scope

This document specifies the technical requirements, inspection rules and packaging, transportation, storage and other aspects of X-ray and gamma-ray gas-filled ionization chambers (hereinafter referred to as "ionization chambers").

Storage, marking, etc., and describes the corresponding test methods.

This document applies to the design, manufacture and inspection of X-ray and gamma-ray gas-filled ionization chambers for radiation protection and radiation environment monitoring.

For reference use with a suitable ionization chamber.

2 Normative references

GB/T 191

GB/T 4208

GB/T 10257

GB/T 10263

GB/T 11684

GB/T 20138

3 Terms and definitions

The following terms and definitions apply to this document.

3.1

Using gas as the working medium, the applied electric field can effectively collect the ions and electrons generated by ionizing radiation in the gas onto the electrodes, but A hermetically sealed detector of ionizing radiation which is not sufficient to produce amplification effects from gases.

3.2

Gas-filled ionization chamber used to measure X-rays and gamma rays.

3.3 characteristic curvecharacteristiccurve

Under constant radiation conditions, other parameters remain unchanged, indicating the relationship between the current or count rate in the radiation field as a function of the applied voltage in the ionization chamber curve.

NOTE 1 This curve is a characteristic of all ionization chambers operating in current and pulse mode.

NOTE 2 For detectors operating in current mode, this characteristic curve is a saturation curve.

[Source. GB/T 4960.6-2008, 2.2.73, modified]

3.4 plateau(regions)

The interval in the ionization chamber characteristic curve in which the measured current or count rate is essentially independent of the applied voltage.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 11684 · GB/T 20138

Editions of GB/T 45608

Edition	Title	Revision	Status
GB/T 45608-2025	Gas-filled ionization chamber for X and gamma-ray	current edition	Current

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