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GB 20664-2006 PDF English

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GB 20664-2006: Limitation concentration of natural radioactivity in non-ferrous metal ores and concentrates products
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GB 20664-2006: Limitation concentration of natural radioactivity in non-ferrous metal ores and concentrates products


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ICS 73.060 D 40 GB National Standard of the People’s Republic of China Limitation concentration of natural radioactivity in non-ferrous metal ores and concentrates products Issued on. DECEMBER 07, 2006 Implemented on. MAY 1, 2007 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration Committee;

Table of Contents

Foreword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 5 4 Requirements... 6 5 Testing procedure and methods... 7 6 Management Control... 8 Appendix A... 9 Appendix B... 12

Foreword

Chapter 4 of this Standard is mandatory, and the rest are recommended. This Standard refers to the International Atomic Energy Agency (IAEA) Safety Guide " Application of the Concepts of Exclusion, Exemption and Clearance” (No. RS-G-1.7), and combines our radioactive inspection’s experience of non-ferrous metal mineral products. This Standard clearly defines the natural radioactivity limit requirements of non-ferrous metal mineral products, and it is essential for the rational utilization of mineral resources, the protection of the homeland and the environment, and the protection of public health. Appendix A and Appendix B are normative. This Standard was proposed by the General Administration of Quality Supervision, Inspection and Quarantine, and China Nonferrous Metals Industry Association. This Standard is under the jurisdiction of the National Non-ferrous Metal Standardization Technical Committee. This Standard is responsibly drafted by. Shandong Entry - Exit Inspection and Quarantine bureau. Participating drafting organization of this Standard. Tongling Nonferrous Metals (Group) Company. This Standard is mainly drafted by. Song Jiguo, Ma Xin, Sun Jian, Zhu Jinrong, and Gao Jianmin. This Standard is commissioned to National Non-ferrous Metal Standardization Technical Committee for interpretation. This Standard was first-time developed. The limit requirements of natural radioactive in non-ferrous metal products

1 Scope

This Standard specifies the limit requirements of natural radioactive in non-ferrous metal products, and over-limit of natural radioactivity activity concentration and management control of artificial radionuclide pollution. This Standard applies to development and utilization of non-ferrous metal products such as copper, lead, zinc, tin, nickel, and cobalt. The development and utilization of other minerals can also refer to the provisions of this Standard.

2 Normative references

The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 2007.2-1987 General rules for the sampling and sample preparation of minerals in bulk - Manual method of sample preparation GB/T 4960.5-1996 Glossary of terms Nuclear science and technology - Radiation protection and safety of radiation sources GB/T 11713 Standard methods of analyzing low specific γ radioactivity samples by semiconductor γ spectrometers GB/T 14583-1993 Norm for the measurement of environmental terrestrial γ - Radiation dose rate JJG 752-1991 Activity Standard Device for Ge-γ-Ray Spectrometer

3 Terms and definitions

The following terms and definitions apply to this Standard. 3.1 Radioactivity The nature that some nuclides spontaneously emit particles or γ rays, or the occurrence of X-ray after orbital electron is captured, or the occurrence of spontaneous fission. [GB/T 4960.5-1996, the term 2.1] 3.2 Nuclide The atom which has the equal number of protons, neutrons, and in the same nuclear energy states. 3.3 Radionuclide Radioactive nuclides. [GB/T 4960.5-1996, the term 2.5] 3.4 Activity At a given moment, a certain amount of radionuclide activity A which is in a particular energy state is a quotient obtained by that dN is divided by dt. [GB/T 4960.5-1996, the term 4.31] 3.5 Activity concentration In the safe field of radiation, it generally refers to the radioactivity activity per unit of mass or per unit of volume substance; the former is also called the specific activity.

4 Requirements

4.1 Natural radionuclide activity concentration Activity concentration limits of natural radionuclide U238, Ra226, Th232, K40 in non-ferrous metal mineral products are. 4.2 Screening Levels Under the measurement condition at 0.1 m away from the stockpile (the diameter ≥2 m, the thickness ≥ 1 m) surface of non-ferrous metal mineral products, It is specified that the on-site screening level of mineral products’ γ radiation dose rate (including environmental γ background dose rate) is 400 nGy/h.

5 Testing procedure and methods

5.1 Inspection procedure Conducting the radioactive inspection of non-ferrous metal mineral products shall follow the following inspection procedure. 5.2 on-site screening methods On-site screening methods of product γ radiation dose rate shall be conducted according to provisions in Appendix A. 5.3 The sample preparation and analysis methods of nuclide analysis 5.3.1 The selected mineral product samples for nuclide analysis shall be representative. For mineral products of which the surface γ radiation dose rate is distributed uniformly, its sample preparation method shall be conducted in accordance with provisions in Appendix B.

6 Management Control

6.1 Non-ferrous metal mineral products shall be conducted for radioactivity inspection in accordance with the provisions of this Standard. 6.2 Non-ferrous metal mineral products in circulation field shall accept radioactivity inspection in accordance with the provisions of this Standard. After inspection, only when confirming that the product meets this Standard, it can be circulated.

Appendix A

(Normative) On-site screening methods of γ radiation dose rate A. 1 Scope This Appendix specifies on-site screening methods of γ radiation dose rate in non-ferrous metal products. This Appendix applies to on-site screening methods of γ radiation dose rate in on-ferrous metal products such as copper, lead, zinc, tin, nickel, and cobalt. A.2 Principle Under certain environmental conditions, the γ radiation dose rate produced by natural radionuclide in mineral products is proportional to its radioactivity, through the screening of γ radiation dose rate in mineral product heap, the concentration limit of radionuclide activity in mineral products can be basically identified. A.4 Testing procedure of on-site screening A.4.1 Instrument starting TURN on the power. PERFORM self-test of the instrument. CONFIRM that the instrument indicates normally to the testing source and environment background. SET the warning value of dose rate instrument, according to the radiological control requirements of the measured non-ferrous mineral products. and then GO into test state. A.4.2 Containerized non-ferrous metal mineral products ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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