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GB 12951-2009 English PDF

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GB 12951-2009: [GB/T 12951-2009] Americium-241 alpha sources for ionization smoke fire detectors
Status: Valid

GB 12951: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB 12951-2009English319 Add to Cart 3 days [Need to translate] [GB/T 12951-2009] Americium-241 alpha sources for ionization smoke fire detectors Valid GB 12951-2009
GB 12951-1996English359 Add to Cart 3 days [Need to translate] Specification of americium-24l alpha sources for ionization smoke fire detectors Obsolete GB 12951-1996
GB 12951-1991EnglishRFQ ASK 3 days [Need to translate] Specification of americium-241 alpha sources for ionization smoke fire detectors Obsolete GB 12951-1991

PDF similar to GB 12951-2009


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Basic data

Standard ID GB 12951-2009 (GB12951-2009)
Description (Translated English) [GB/T 12951-2009] Americium-241 alpha sources for ionization smoke fire detectors
Sector / Industry National Standard
Classification of Chinese Standard F51
Classification of International Standard 13.030.30
Word Count Estimation 12,194
Date of Issue 2009-03-13
Date of Implementation 2010-03-01
Older Standard (superseded by this standard) GB 12951-1996
Quoted Standard GB/T 2828.1-2003; GB 4075-2009; GB/T 6378; GB 11806; GB 15849; EJ/T 535
Regulation (derived from) Announcement of Newly Approved National Standards No. 3, 2009 (No. 143 overall)
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This Chinese standard specifies the ionic smoke detectors americium 241�� sources (hereinafter referred to as"Am �� source") the technical requirements, test methods, inspection rules, marking and inspection certificates, packaging, transportation and storage. This standard applies to all kinds of ion smoke detectors americium 241�� sources.

GB 12951-2009: [GB/T 12951-2009] Americium-241 alpha sources for ionization smoke fire detectors


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Americium-241 alpha sources for ionization smoke fire detectors ICS 13.030.30 F51 National Standards of People's Republic of China Replacing GB 12951-1996 Ion Smoke Detector with radioactive americium 241α Posted 2009-03-13 2010-03-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

All the technical contents of this standard is mandatory. This standard replaces GB 12951-1996 "ion smoke detectors use americium 241α sources of technical conditions." This standard compared with GB 12951-1996 main changes are as follows. --- The standard GB 12951-1996 3.4 increase source mount and the source base is described; --- On the "safety rating" re-do description; --- 5.4 parts has been adjusted; --- Modify the contents of the inspection certificate. Appendix A of this standard is an informative annex. The standard proposed by China National Nuclear Corporation. This standard by the National Standardization Technical Committee of nuclear energy. This standard was drafted. four in the fourth nuclear power plant ○ Limited. The main drafters of this standard. car Ming-sheng, Chen Qingyun, GAO Jian, Shao Yun, Guan Xiao Zhong, Chao victory, Xu Xiangdong. This standard replaces the standards previously issued as follows. --- GB 12951-1991, GB 12951-1996. Ion Smoke Detector with radioactive americium 241α

1 Scope

This standard specifies the ionization smoke detector technical requirements for radioactive americium 241α (hereinafter referred to as "Am α source"), test methods, Inspection rules, marking and inspection certificate, packing, transportation and storage. This standard applies to all kinds of ion smoke detectors use americium 241α sources.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 2828.1-2003 Sampling procedures for inspection - Part 1. by acceptance quality limit (AQL) retrieval batch test sample plan GB 4075-2009 Sealed radioactive sources - General requirements and classification GB/T 6378 percent nonconforming sampling inspection procedures and charts (for continuous batch of checks) GB 11806 Regulations for the Safe Transport of Radioactive Substances Leakage test methods GB 15849 sealed radioactive sources EJ/T 535 ion smoke detectors -241α americium source environment test

3 Technical requirements

3.1 Structure Am α source should be part of americium 241α source sheet, the source holder and the like. α-chip source and the source holder should fit properly without being loose. 3.2 Requirements for raw materials 3.2.1 radionuclide and impurities Nuclide. americium 241 (241Am); γ impurity content of not more than 1%. 3.2.2 overburden material Cover material should be gold-palladium alloy or other equivalent material. 3.2.3 Source scaffold Source scaffold should be used 1Cr18Ni9Ti, 0Cr18Ni10Ti or other equivalent material. 3.3 safety rating Am α source safety performance level should not be less than GB 4075-2009/C32222. Appearance 3.4 Am α source Americium α Yuanyuan sheet surface should be smooth, no cracks, no discoloration, no pinholes, no scratches and the like. Surface source mount and the source of the base should be smooth, No glitches. 3.5 Am α source activity Am α source of radioactivity should be limited to 370kBq. Total uncertainty Am α source activity test value shall not exceed ± 10%. α α spectrum 3.6 americium source For α particles α americium peak energy source in 3.0MeV ~ 4.0MeV range of its spectrum of α particles should be less than half width 1.2MeV; α of 4.0MeV above americium source that α particle energy spectrum FWHM should not exceed 0.8MeV. Surface emissivity 3.7 α particle dispersion Dispersion α particle surface emissivity Am α source shall not exceed the nominal value ± 20%. 3.8 Surface Contamination Am α source of surface contamination should not exceed 200Bq. 3.9 Environmental Testing Environmental testing results Am α source should meet EJ/T 535 requirements. 3.10 Term Under normal conditions of use americium source α period of 5 years. Test Method 4 4.1 safety rating tests carried out according to the provisions of GB 4075. 4.2 appearance test by visual inspection. 4.3 Am α source activity, α particle energy, α particle surface emissivity spectrum test shall use the methods provided in Appendix A or other eligible The method of testing requirements were. 4.4 Am α source α particle surface emissivity test may be used to test the value of the uncertainty of α counts less than 10% of the measuring device to be tested. 4.5 level surface contamination and leakage tests carried out according to the provisions of GB 15849. 4.6 Environmental Testing conducted by EJ/T 535 requirements.

5 Inspection Rules

5.1 Overview Product inspection is divided into type test and factory inspection. Am α source of performance tests made at the time of type testing and factory inspection, see Appendix A. 5.2 Type inspection The standard 3.1 to 3.9 for the type inspection items. Wherein. 3.2,3.3,3.5,3.6,3.7 is always checked. When the following conditions occur, you should type inspection. a) the development of new products; b) products in the design, specification, technology and materials have significant changes; c) the production of varieties not often when production again; d) mass production of bulk products, sampling should be carried out regularly. Type inspection items include. a) safety performance rank test; Index Test b) Am α source activity, α and α particle spectrum particle surface emission rate; c) the level of surface contamination and leakage test; d) Environmental testing. 5.3 factory inspection Factory inspection items include. a) visual inspection; b) α particle spectra; c) α particle surface emissivity index testing; d) surface contamination; e) the level of leakage test. 5.4 Sampling Inspection Method Sampling inspection method according to GB/T 2828.1 regulations or GB/T 6378's. Wherein the test level and acceptable quality level (AQL) refers to Determination in consultation by both parties.

6 Identify and inspection certificate

6.1 Logo Am α source product logo, may be provided in the form of product inspection certificate. 6.2 inspection certificate Production unit of manufactured products, provide product inspection certificate delivery units. Inspection Certificate includes. a) radioactive source name, source model and lot number; b) a source of safety performance level test results; Activity c) sources, α and α particle energy particle surface incidence of technical specifications; d) the level of surface contamination and leakage test results; e) test basis; f) production units and inspection certificate issuer, date of inspection. 7 packaging, transport and storage 7.1 Packaging and Transport Packaging and transportation Am α source according to the requirements of GB 11806 was. 7.2 Storage Am α source should be stored in ventilated, dry and non-corrosive gas environments.

Appendix A

(Informative) Am α source Performance Measurement A. 1 cover layer uniform Am α source energy measurement A. 1.1 measuring instruments and their requirements A. 1.1.1 gold silicon surface barrier detectors. The indicators should be consistent with GB/T 5201 requirements. A. 1.1.2 linear amplifier and pre-amplifier. The indicators should be consistent with GB/T 4079 requirements. A. 1.1.3 computer multi-channel amplitude analyzer. The indicators should be consistent with GB/T 4833.1 requirements. A. The total uncertainty of the measurement systems 1.1.4 ± 5%. A. 1.2 Measurement Methods A. 1.2.1 using three or more different energy sources for α standard multi-channel amplitude analyzer energy scale. A. 1.2.2 scales used α sources of self-absorption on the measurement results, it should ensure that it can be ignored or can be corrected. A. 1.2.3 scales according to conditions Am α source of energy measurement. Measurement should be kept constant measurement conditions. A. 1.2.4 Even if the result of the determination based on a computer analysis of the corresponding energy, the method can also be used to calculate the corresponding energy obtained. A. 2 cover layer uniform Am α source activity measurement method A. 2.1 small solid angle measurement device A. 2.1.1 measuring device and its requirements Measuring apparatus and its requirements include. a) small solid angle unit. Made of stainless steel tube processing. Shall be accurate and reliable positioning plate and collimator to maintain the source and the collimator The concentric and parallel. It should ensure that the device may be evacuated to 0.67Pa less. b) detector. It may be indicators in line with GB/T 5201 requirements of the surface barrier semiconductor detector or using CsI (Tl) crystal thin Scintillation detector. c) automatic scaler. Threshold should be continuously adjustable. Using computer multi-channel pulse amplitude analyzer automatic calibration device may also be used. System d) measuring means total uncertainty of less than ± 5%. A. 2.1.2 Measurement Measurement method comprising. a) When using gold silicon surface barrier detectors, shall be measured according to GB/T 5201 requirements of the selected measurement conditions. b) shall be measured to ensure that the degree of vacuum means less than 1.33Pa. c) shall ensure that the measuring device the minimum measurable signal amplitude corresponding to the α particle energy measurement conditions. Before using the device should be used 241Am standard source of stoichiometry; put into use, it should be measured regularly compared. A. 2.1.3 Data Processing The formula of measurement results (A.1) as follows. A0 = like 0G · η (A.1) Where. A0 --- Am α source activity in units of Baker (Bq); Like α 0 --- corrected count rate in units of cps; G --- with 4л normalization of geometry; η --- and measurement conditions independent of detector efficiency. A. 2.2 low energy photon measurement methods A. 2.2.1 measuring device and its requirements A. 2.2.1.1 Detectors May be NaI (Tl) scintillation crystal thin detector, semiconductor detector may be used. When using NaI (Tl) thin crystal, the crystal window It should be thin beryllium windows or aluminum windows. A. 2.2.1.2 linear amplifier and preamp The indicators of the instrument should be consistent with GB/T 4079 requirements. A. 2.2.1.3 Automatic scaler Threshold should be continuously adjustable. The computer may also be multi-channel pulse height analyzer. It should ensure that the total uncertainty of the measurement system means little 5%. A. 2.2.2 Methods of measurement and data processing A. 2.2.2.1 During the measurement should be consistent measurement conditions, americium α source shall be aligned with the front of the detector, the distance between americium α source and detector can be Nominal size is determined based on the activity of α americium source. A. 2.2.2.2 according to selected criteria, set screening thresholds to measure or obtain α americium source from the entire spectrum curve measured in 0.0596MeVγ Ray photoelectric peak pulse count within. Then according to the source peak detection efficiency means obtains γ photons emitted Am α source. A. 2.2.2.3 According to americium 241 isotope decay exact figure has been known γ photon energy and the relationship between the branching ratio by the γ 0.0596MeV γ photon emission rate of photon yield and measured, calculated Am α source activity. A. 2.2.2.4 should be used regularly 241Am standard source for calibration of the measurement device. references [1] GB/T 4079 for ionizing radiation detectors charge sensitive amplifier and pre-amplifier test methods [2] GB/T 4833.1 multi-channel analyzer - Part 1. Technical requirements and test methods [3] GB/T 5201 Test Method for semiconductor charged particle detectors

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