| Primary study on holdup measurement of ^235U in pipe using γ-ray spectrometry and Monte Carlo simulation |
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| 作者姓名： | WU Lun-Qiang WEI Meng-Fu ZHANG Lian-Ping YANG Suo-Long |
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| 作者单位： | China Academy of Engineering Physics, Mianyang 621900, China |
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| 基金项目： | Acknowledgments We thank Prof. Z0U Lexi and associate professor LU Chunhai for beneficial discussion. |
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| 摘 要： | The pipe holdup measurement is very important for decommissioning nuclear facilities and nuclear-material control and accounting. The absolute detection efficiencies （εsp） of full-energy γ rays peak under different source density distribution function have been simulated using the Monte Carlo （MC） software, and the counting rates （no） of the characteristic γ rays have been measured using the γ spectrometer followed by the calculation of the holdup. The holdup is affected by the energy of γ rays, distance at which they are detected, pipe material, thickness, and source distribution of pipe, especially source distribution at a short distance. The comparative test of ^235U reference materials on the inner wall of Fe and A1 pipes （the total mass of ^235U is 44.6 mg and 222.8 mg, respectively） have been accomplished using this method. The determined result of ^235U is 43.2mg （U0.95rel=5.4%） and 216.2mg （U0.95rel= 3.2%）, respectively, which are in accordance with the reference values.
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| 关 键 词： | 核设施 管道测量 铀235 源分布 γ射线光谱测定法 蒙特卡罗模拟法 |
| 收稿时间： | 2005-10-25 |
Primary study on holdup measurement of U in pipe using γ-ray spectrometry and Monte Carlo simulation |
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| WU Lun-Qiang WEI Meng-Fu ZHANG Lian-Ping YANG Suo-Long.Primary study on holdup measurement of U in pipe using γ-ray spectrometry and Monte Carlo simulation[J].Nuclear Science and Techniques,2006,17(4):241-244. |
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| Authors: | Lun-Qiang WU Meng-Fu WEI Lian-Ping ZHANG Suo-Long YANG |
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| Affiliation: | aChina Academy of Engineering Physics, Mianyang 621900, China |
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| Abstract: | The pipe holdup measurement is very important for decommissioning nuclear facilities and nuclear-material control and accounting. The absolute detection efficiencies ( sp) of full-energy γ rays peak under different source density distribution function have been simulated using the Monte Carlo (MC) software, and the counting rates (n0) of the characteristic γ rays have been measured using the γ spectrometer followed by the calculation of the holdup. The holdup is affected by the energy of γ rays, distance at which they are detected, pipe material, thickness, and source distribution of pipe, especially source distribution at a short distance. The comparative test of 235U reference materials on the inner wall of Fe and Al pipes (the total mass of 235U is 44.6 mg and 222.8 mg, respectively) have been accomplished using this method. The determined result of 235U is 43.2 mg (U0.95rel=5.4%) and 216.2 mg (U0.95rel=3.2%), respectively, which are in accordance with the reference values. |
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| Keywords: | Holdup Pipe Source distribution Monte Carlo simulation γ spectroscopyCLC numbers: O571 212+ 5 O242 2 |
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