GB 20664-2006 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 20664-2006 | English | 120 |
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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
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB20664-2006
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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