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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 30151-2013: Characterization of the spectrum background in HP Ge gamma-ray spectrometry Status: Valid
Basic dataStandard ID: GB/T 30151-2013 (GB/T30151-2013)Description (Translated English): Characterization of the spectrum background in HP Ge gamma-ray spectrometry Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: F81 Classification of International Standard: 27.120 Word Count Estimation: 15,151 Quoted Standard: GB/T 4833.1; GB/T 4960.6; GB/T 7167 Adopted Standard: IEC 61976-2000, MOD Regulation (derived from): National Standards Bulletin No. 25 of 2013 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 standard specifies the �� spectrometer with high purity germanium detector consisting of the background spectrum characteristics. This standard applies to the �� spectrometer consisting of high purity germanium detectors collect the background spectrum GB/T 30151-2013: Characterization of the spectrum background in HP Ge gamma-ray spectrometry---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.Characterization of the spectrum background in HPGe gamma-ray spectrometry ICS 27.120 F81 National Standards of People's Republic of China Background HPGe γ Spectrometer Spectral characteristics (IEC 61976.2000, Nuclearinstrumentation-Spectrometry- gamma-rayspectrometry, MOD) Issued on. 2013-12-17 2014-08-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released Table of ContentsPreface Ⅰ Introduction Ⅱ 1 Scope 1 2 Normative references 1 3 Terms and definitions Description 4 Spectrum 2 5 bottom spectral characteristics 2 Appendix A (informative) common peak energy 4 Illustrative examples and Annex B (informative) background continuous spectrum and the background peak measured 5 Reference 10ForewordThis standard was drafted in accordance with GB/T 1.1-2009 given rules. This standard uses redrafted law revision adopted IEC 61976.2000 special "high purity germanium spectrometer instrument nuclear γ-ray spectrometer spectrum of the background Sex. " The standard IEC 61976.2000 The main changes are as follows [terms of these modifications have been involved in the blank position by its outer margins A single vertical line (│) be indicated]. --- Increasing the "Introduction" to include purposes other "Scope and purpose" in the standard preparation of IEC standards related to the content of Chapter 1; --- According to GB/T 1.1 requirement to rewrite Chapter 1, "scope"; --- Chapter 2, "Normative references", with GB/T 4960.6-2008 "Nuclear Science and Technology - Part 6. Nuclear Instrumentation" In place (see IEC 60050-393.2003 and IEC 60050-394.2007 preparation) IEC 60050-393.1996 "Nuclear Instruments Physical phenomena and basic concepts "and IEC 60050-394.1995" Nuclear Instruments Instruments "; increased references GB/T 4833.1 "Multi-channel analyzer - Part 1. Technical requirements and test methods" and GB/T 7167 "germanium γ-ray detector test side law"; --- Change the title of Chapter 3 "Terms and Definitions"; --- Chapter 4, "the description of the spectrum" to increase the general measurement γ spectrum, namely "HPGe γ spectrometer γ spectrum should adopt the general measurement GB /Method "T 4833.1 and GB/T 7167 provided; --- 5.1 "background continuous spectrum" "(also determine energy in any other interested)" with "(also in any other interested Point energy or energy interval determined) "to expand the background continuous spectrum measured energy range of options; --- In 5.2 "contains the total number of tracks," add "error is relatively small and the calculation results of the measurements, it may be necessary An increase in the "first and" on. "; --- Increase in Table A.1 Notes to Table. "The 226Ra, 226Ra and 222Rn under equilibrium conditions can be measured 226Ra spectrum; for 238U, 238U and 226Ra under equilibrium conditions (difficult to achieve) can be obtained by measuring the spectrum of 238U and 226Ra analysis and calculation of Spectrum. "; --- Increase in Appendix B (informative) "illustrative examples of the bottom and continuous spectrum measurements of peak and background", that is, for Chapter 5, "this Detroit "Of the formula (1) and (2) gives a schematic view, in order to deepen the understanding of the formula, it has added two solid background continuous spectrum and background peaks Measured spectra, in order to enrich the content of this standard; --- Increased references included in the GB/T 2900.81-2008 "Electrotechnical Terminology Nuclear Instruments Physical phenomena and basic concepts" and GB/T 2900.82-2008 "Electrotechnical Terminology nuclear instrumentation, systems, equipment and detectors." This standard by the National Nuclear Instrument Standardization Technical Committee (SAC/TC30) centralized. This standard was drafted. Nuclear Industry Standardization Institute, Chinese Academy of Sciences Institute of High Energy Physics, Tsinghua University. The main drafters of this standard. Xiongzheng Long, Zhao Jingwei, agriculture Liu, Yan Chenchang, Zhu Xuemin, Li Yulan.IntroductionThe purpose of this standard is to describe and measure the high-purity germanium detector composed of γ spectrometer background spectrum to provide a unified approach and its definition The method is particularly suitable for low background γ spectrometer Review by HPGe detector configuration. Measurement methods defined in this standard background continuous spectrum and the background peak is determined on the basis of a large number of experimental results, this method not only mention Supply manufacturers and users, but also provide a similar comparison between the measurement of several different types of high-purity germanium detector. Background HPGe γ Spectrometer Spectral characteristics1 ScopeThis standard specifies the γ spectrometer with high purity germanium detector consisting of the background spectrum characteristics. This standard applies to the high-purity germanium detector γ spectrometer consisting of the acquisition of the background spectrum, particularly low background detectors capture the background spectrum. This standard does not address methods to reduce background.2 Normative referencesThe following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB/T 4833.1 multi-channel analyzer - Part 1. Technical requirements and test methods (GB/T 4833.1-2007, IEC 61342.1995, MOD) GB/T 4960.6 nuclear science and technology - Part 6. Nuclear instrumentation GB/T 7167 germanium γ-ray detector test methods3 Terms and DefinitionsGB/T 4960.6 and define the following terms and definitions apply to this document. 3.1 (Ionizing radiation) spectrum spectrum (ofanionizingradiation) Usually it refers to with energy distribution, such as the relationship between particle emission rate and its energy value of a particular amount of radiation. [GB/T 4960.6-2008,3.1.37] 3.2 FWHM fulwidthathalfmaximum; FWHM Single peak in the distribution curve formed from the horizontal axis between two points on the curve at half peak. [GB/T 4960.6-2008,3.2.27] 3.3 Sample sample Attention and need to measure a material in which the radionuclide and content. 3.4 External background externalbackground In the absence of the sample in a given configuration, high-purity germanium detector measured spectrum. 3.5 Samples induced background sample-inducedbackground Emitted by the sample, and does not include all the spectral data detector placed near any source (including samples) of all-round peak. 3.6 Total background totalbackground External background and the background of the sample and induced. 3.7 The bottom peak backgroundpeak All-around peaks generated by an external source of any of the background spectrum. 3.8 Background continuum backgroundcontinuum External background spectrum does not belong to any data Almighty peak. 3.9 Peak baseline peakbaseline Near the end of the peak region that belongs to the external background and not part of the sample induced by the almighty bottom peak count. Description 4 Spectrum The bottom spectrum collection time should be long enough to ensure that the energy within the range of one standard deviation 100keV statistical uncertainty about 5%. This means that, in the area of \u200b\u200benergy 100keV measured spectra, counts per channel should not be less than 400 to reduce the statistical uncertainty in the data Given the degree of impact on the bottom spectrum measurements. Mean number of spectrum should be more than enough, that is, the energy range of interest collected per channel energy representation foot Small enough so that, by - a calculation error "channel energy" transformation caused by the uncertainty compared with the theoretical value small enough. Before you begin measuring the background spectrum, shall take all necessary precautions to avoid possible in laboratory experiments, inspection, calibration using Any source of radiation to which (including natural and artificial, such as X-ray, neutron generators and particle accelerators) on the measured background spectrum. External factors that can seriously affect the background spectrum is. Geometrical position a) measurement; b) shielding material and its thickness and geometry (including the probe position); Date and time c) measurement; d) measurement of weather conditions; Duration e) measurement; f) airborne radioactivity; g) the circulation of air in the measuring chamber. Therefore, a detailed description of the measurement location and condition [above a) ~ g)] should be included in the measurement results of the report. HPGe γ spectrometer general measurement γ spectrum should adopt the method of GB/T 4833.1 provides and GB/T 7167. Peak energy commonly used radionuclides in Appendix A.5 bottom spectral characteristics5.1 Bottom continuous spectrum Background continuum average of B (E) to the "counts per keV one thousand seconds" said. B (E) should be counted within the following range of energy level Mean, that is designated as the center of energy, which is the width of the detector in a given FWHM energy (energy resolution) five times. In all calculations The number of tracks from the energy to the conversion should be rounded (ie decimal between 0.0 and 0.49999 accrued to 0.0, between 0.5 and 0.99999 Decimal accrued 1.0). B (E) by the formula (1) is given by. B (E) = TL · G 5F (E) 1 · Σ j 2.5F (E) i = j-2.5F (E) Ci (1) Where. B (E) --- the average background continuous spectrum at energy E, in units of counts per keV one thousand seconds (keV × 1000s) -1; TL --- live time, in seconds (s); G --- channel number conversion factor to energy, in units of keV per channel (channel/keV); F (E) --- detector at energy E of the resolution of the unit is to half width (FWHM) represents the number of channels; Ci --- i-channel track count; j --- corresponds to the number of road energy E. The average amount of B (E) represents the continuous spectrum of the background, a description of the background spectrum without background peak areas most useful. It also describes the background peak region Average background, but it can mask the true value of the individual peaks. For a particular high purity germanium detectors, B (E) is preferably at three energy points (50keV, 140keV and 1350keV) determine (section may also determine at any other energy or energy point of interest), and the result Recorded in the background spectrum measurement reports. And illustrative examples of the bottom continuous spectrum measurements in Appendix B. 5.2 Bottom peak In the external background spectrum, the final version of the end of the peak energy of the selected net peak area ANP (E) to "count per thousand second" representation. ANP (E) to the selected Energy at three times the FWHM area totaled minus peaks baseline counts the same area calculated. Peak baseline counts by the energy region below the background peak Count count is higher than the domain of this region and the end of the peak energy is determined. Lower than the peak energy of the background region from less than 3 times the background peak energy FWHM extended to 1.5 times the FWHM. Above background peak area from the peaks above background energy of 1.5 times FWHM extended to three times the FWHM. ANP (E) by the formula (2) is given by. ANP (E) = T [L Σ j 1.5F (E) i = j-1.5F (E) Ci- Σ j-1-1.5F (E) i = j-1-3F (E) Ci- Σ j 1 3F (E) i = j 1 1.5F (E) C] i (2) Where. ANP (E) --- corresponds to the net area of \u200b\u200bthe bottom peak energy E per unit time, measured in counts per one thousand seconds (1/1000s). When the ANP (E) is negative should be reported as zero. When using the formula (2), such that "first and" equal to the number of channels included in the "second and" and "the third and the" total number of channels included, And the calculation results of the measurement error is relatively small, it may need to increase in a "first and" on. If you observe a baseline Distinct slopes, the second and the third and the number of channels should be equal. It is necessary to more than three normalization is contained in each summation term The number of channels in order to correctly calculate the number of channels. And illustrative examples of the bottom peak measured in Appendix B.Appendix A(Informative) Common peak energy The following peak energy from natural and artificial radionuclides emitted radioactive material approved by the presence of the detector or the natural environment, And many users are interested in Table A.1. For specific applications, but also the provisions of other isotopes and energy. "Yu [universe] born [into] the" It means cosmic rays interacting with the listed material generated. Note. Health-interaction data from "low-activation analysis background γ ray analysis laboratory", RMLindstrom, DJLindstrom, LASlaback And JKLangland, Nuclear Instruments and Methods (NIM) A299 (1990) 425 ~ 429. Table A.1 common γ-ray peak energy meters Energy/keV energy source/keV energy source/keV source 13 UX ray 185.7,186.2 238U, 226Raa 846.8 universe 56Fe 25.6 231Th (235U) 197.1 universe 71Ge, 19F 911.1 228Ac (232Th) 31.8 ~ 37.3 137Cs 215.5 universe 77Gem 962.1 universe 63Cu 46.5 210Pb (238U) 238.6 212Pb (232Th) 968.9 228Ac (232Th) 53.4 Yu students 73Gem 295.2 214Pb (238U) 1001.0 234mPa (238U) 59.5 241Am 351.9 214Pb (238U) 1063.6 cosmogenic of 207Pb 63.3 234Th (238U) 511 cosmogenic, the annihilation of the cosmogenic 1115.5 65Cu Students 73Gem 569.7 66.7 Yu Yu students 207Pb 1120.3 214Bi (238U) 72.8 PbX ray 583.1 208Tl (232Th) 1173.2 60Co 75.0 PbX ray of 596.1 cosmogenic 74Ge (n, n ') 1238.1 214Bi (238U) 84.8 PbX ray 609.3 214Bi (238U) 1327.0 cosmogenic of 63Cu 87.3 PbX ray 661.6 137Cs 1332.5 60Co 92.6 234Th (238U) 669.6 cosmogenic of cosmogenic of 63Cu 63Cu 1412.1 Students 19F 693.4 109.9 Yu Yu students 72Ge (n, n ') 1460.8 40K 122.1 Cosmogenic of 57Fe 727.2 212Bi (232Th) 1481.8 cosmogenic of 65Cu 139.7 Cosmogenic of 75Gem 766.6 234mPa (238U) 1764.5 214Bi (238U) Students 77Gem 770.6 159.7 Yu Yu students 63Cu 2614.6 208Tl (232Th) Students 71Ge 803.3 174.9 Yu Yu students 206Pb (n, n ') Note. 226Ra, 226Ra and 222Rn under equilibrium conditions can be measured 226Ra spectrum; for 238U, 238U and 226Ra under equilibrium conditions (difficult to achieve) can By measuring and analyzing the spectrum obtained 238U and 226Ra computing spectrum. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 30151-2013_English be delivered?Answer: Upon your order, we will start to translate GB/T 30151-2013_English as soon as possible, and keep you informed of the progress. 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