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GB/T 39427-2020 English PDF

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GB/T 39427-2020: (Non-destructive testing industrial Ir192 gamma-ray source size measurement method)
Status: Valid

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB/T 39427-2020	English	229	Add to Cart	3 days [Need to translate]	(Non-destructive testing industrial Ir192 gamma-ray source size measurement method)	Valid	GB/T 39427-2020

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Basic data

Standard ID	GB/T 39427-2020 (GB/T39427-2020)
Description (Translated English)	(Non-destructive testing industrial Ir192 gamma-ray source size measurement method)
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J04
Word Count Estimation	12,173
Date of Issue	2020-11-19
Date of Implementation	2021-06-01
Regulation (derived from)	National Standard Announcement No. 26 of 2020
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration

GB/T 39427-2020: (Non-destructive testing industrial Ir192 gamma-ray source size measurement method)

---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.
(Non-destructive testing industrial Ir192 gamma-ray source size measurement method) ICS 19.100 J04 National Standards of People's Republic of China Nondestructive testing industry Ir192 gamma-ray source size measurement method 2020-11-19 released 2021-06-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Preface Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Equipment and equipment 1 5 Measurement procedure 3 6 Gamma ray source size determination 5 7 Determination of the maximum size of the gamma ray source 6 8 Test report 6 Appendix A (informative appendix) A specially designed guide tube 7 Appendix B (informative appendix) Gamma-ray source size calculation formula instructions 8 Appendix C (informative appendix) Sample test report 9

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed and managed by the National Standardization Technical Committee for Nondestructive Testing (SAC/TC56). Drafting organizations of this standard. National Nuclear Power Plant Operation Service Technology Co., Ltd., Shanghai Materials Research Institute, Shanghai Clover Industrial Co., Ltd. Mengamma Star Flaw Detection Equipment Co., Ltd. The main drafters of this standard. Wang Cong, Tang Guoxiang, Jiang Jiansheng, Pan Bingxun, Ding Jianping, Yang Hengliang, Zhao Jiaguan, Ding Jie, Ma Jun, Huang Yin. Non-destructive testing industrial Ir192 gamma ray source size test methods

1 Scope

This standard specifies the method for measuring the size of Ir192 gamma ray source by using a reference sample and radiographic film exposed together with Ir192 gamma ray source. This standard applies to the measurement of the Ir192 gamma-ray source size newly purchased or in use by the user. Ir192 gamma ray source The production unit may also refer to this standard when determining the size of the ray source.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. GB/T 12604.2 Nondestructive Testing Terms Radiographic Testing GB/T 19348.1-2014 Non-destructive testing industrial radiographic film Part 1.Classification of industrial radiographic film systems GB/T 19802 Minimum requirements for industrial radiographic film viewers for non-destructive testing JB/T 13156 Non-destructive testing method for measuring the optical density of industrial radiographic film

3 Terms and definitions

The following terms and definitions defined in GB/T 12604.2 and JB/T 13156 apply to this document. 3.1 Maximum size of gamma ray source The axis of the gamma ray source (cylinder) is parallel to the film and projects the maximum image size on the film plane.

4 Equipment and equipment

4.1 Ir192 gamma ray source The Ir192 gamma ray source newly purchased or in use should be stored in a gamma ray machine or other special equipment. Driven by operation The Ir192 gamma ray source can be moved to the end of the guide tube. 4.2 Transmission optical density meter The transmission optical densitometer should meet the requirements of JB/T 13156.Before each use of the transmission optical densitometer, the calibrated optical density should be used The step plate calibrates the transmission optical densitometer. 4.3 Film viewer The main performance of the film viewer should meet the relevant regulations of GB/T 19802, and the brightness is required to be.2000cd/m2~3000cd/m2. 4.4 Reference sample The reference sample should be made of non-radiation materials. The recommended material is iridium. Other materials with similar radiation attenuation characteristics can also be used, such as

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