GB/T 7465-2015 in English

VALID

High activity cobalt-60 sealed radioactive sources

Issued on:2015-10-09
Implemented on:2016-11-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $250.00
$243.00

Standard No:	GB/T 7465-2015
Document status:	VALID
Title in English:	High activity cobalt-60 sealed radioactive sources
Title in Chinese:	高活度钴60密封放射源
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2015-10-09
Implemented on:	2016-11-01
Superseding:	GB 7465-2009 High activity cobalt-60 sealed radioactive sources
ICS Classification:	27.120.99-Other standards related to nuclear energy
Chinese Classification:	F51-Radioactive sources
Professional Classification:	GB-National Standard
Related Keywords:	high activity cobalt-60 radioactive sources introduction in-depth interpretation technical indicators naphthalene content requirement added naphthalene content indicators high temperature
Related Topics:	high water activity Cobalt 60 case Cobalt 60 source is harmful to the human body Radioactive source co60+ military radioactive source High Density Features Density is too high nickel radioactive source Cobalt 60 source human body cobalt diffraction peak Cobalt 60 knife Medical Cobalt 60 Cobalt 60 initial activity Cobalt 60 container Heavy Water Reactor Cobalt 60 Cobalt 60 Energy Spectrum Cobalt 60 Scanner Cobalt 60 Applications Diffraction peaks of cobalt cobalt diffraction peak Carbon 60 radioactivity Water temperature 60 degrees Canadian Cobalt 60 not too dense Cobalt 60 import cobalt ray energy Cobalt 60 Market water over 60 degrees The higher the density of states cobalt 60 videos Cobalt 60 radioactive source for medical use Cobalt 60 event Specific activity cobalt 60 Cobalt 60 radiation sterilization World Cobalt 60 Cobalt 60 shines Cobalt 60 spectrum Cereal Cobalt 60 s210-60 Sublimation Cobalt 60 GBT7465 GB/T 7465-2015 sealed radioactive source Industry 60 Radioactive sources The level of specific activity

《GB/T 7465-2015高活度钴60密封放射源》由TC58（全国核能标准化技术委员会）归口，主管部门为国家标准化管理委员会。
本标准规定了高活度钴60密封放射源的结构、技术要求、试验方法、检验规则、标志、检验证书和使用说明书、包装、运输和贮存等内容。
本标准适用于放射性活度(以下简称活度)大于10TBq的远距离治疗用钴60γ源、工业辐照用钴60γ源,也适用于γ刀治疗用钴60γ源、探伤用钴60γ源以及其他用途的活度大于10TBq的钴60γ源。

Introduction

In-depth interpretation of GB/T6699-2015 "Coking Naphthalene" standard

1. Background of standard formulation and analysis of technological evolution

GB/T6699-2015 is the national standard of the People's Republic of China, applicable to coking naphthalene made from naphthalene fraction extracted from coal tar through washing, distillation or crystallization. This standard replaces the old version of the standard GB/T6699-1998, and the main technical updates include:

Added preface, normative references and safety precautions;
Modified the scope of application and deleted the term "fractionation high temperature";
Added naphthalene content indicators and introduced chromatographic analysis methods.

2. Comparison table of standard frameworks (3+ dimensions)

Standard dimensions	GB/T6699-1998	GB/T6699-2015 (new/modified)
Scope of application	Applicable only to solid naphthalene	Covering liquid and solid naphthalene, removing the restriction of "fractionation high temperature"
Technical indicators	Naphthalene content requirement is not specified	New technical requirement of naphthalene content ≥95%
Test method	Chromatographic analysis method not included	Introduction of gas chromatography to determine naphthalene content (Appendix A)

3. Interpretation of the main contents of the standard

3.1 Scope and normative references:This standard applies to naphthalene fractions extracted from coal tar, and specifies technical requirements, test methods and safety precautions. The main referenced documents include: GB/T1999 (sampling of coking oil products), GB/T2000 (sampling of solid products), etc.

3.2 Technical requirements: Coking naphthalene is divided into refined naphthalene and industrial naphthalene, and the indicators include:

Appearance: White or slightly yellow crystals;
Naphthalene content: ≥95% (mass fraction);
Crystallization point: ≥75℃ (superior grade).

4. Implementation suggestions and practical applications

Case analysis: During the production process, a coking plant used gas chromatography (Appendix A) to detect the naphthalene content. By accurately controlling the crystallization point and ash content indicators, the product quality was successfully improved to meet the superior standard.

More samples: JGJ 94-2008 GB 18306-2015 YD/T 3934-2021

Sample only — not a preview of GB/T 7465-2015

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