离线测量钍快中子裂变反应率方法

冯松; 刘荣; 鹿心鑫; 羊奕伟; 王玫; 蒋励; 秦建国

doi:10.7498/aps.63.162501

摘要

钍快中子裂变反应率是钍铀燃料循环中的重要数据. 为了测量基于聚变-裂变混合能源堆包层概念设计的钍样品在宏观中子学装置中的钍快中子裂变数据，发展了钍快中子裂变率的离线活化γ测量方法. 通过测量232Th裂变碎片85mKr的β衰变产物85Rb 发射的151.16 keV特征γ射线，并结合钍裂变产额数据，获得了钍样品装置中232Th裂变反应率的分布. 详细介绍了此方法的原理和影响因素，并利用14 MeV的D-T中子源在贫铀球壳中开展了校验实验，实验不确定度为5.3%–5.5%. 采用MCNP5程序和ENDF/B-VI及ENDF/B-VII数据库模拟计算的结果与实验结果在实验不确定度内基本符合，这证明该方法能够有效地模拟装置中232Th裂变反应率.

关键词:

钍 /
裂变率 /
离线测量

Abstract

Thorium fission reaction rate is an important datum in uranium-thorium fuel cycle. In order to measure the thorium fission rate on the thorium sample equipment which is set up by the conceptual design of the subcritical reactor and to check the thorium data, the off-line activation γ measurement method of thorium fission rate is developed. Combined with thorium fission yield data of 85mKr, the 232Th fission reaction rate distribution in thorium sample device can be obtained by measuring the 151.16 keV feature gamma rays emitted by fission fragment 85mKr. Details of the principles and factors of this method are discussed, and the verification experiment is carried out on a depleted uranium shell of R13.1/30.0 cm with D-T neutrons. The relative uncertainty of experiment is 5.3%-5.5% for thorium fission reaction rates. The experiment is simulated using MCNP5 with ENDF/B-VI and ENDF/B-VII libraries, simulation results and experimental results accord well with each other within the experimental uncertainty, showing that this approach developed in this paper can work well for determining the thorium fission rate.

Keywords:

作者及机构信息

1.
中国工程物理研究院核物理与化学研究所, 绵阳 621900;

2.
清华大学工程物理系, 北京 100084

基金项目: 国家自然科学基金（批准号：91226104）资助的课题.

Authors and contacts

1.
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;

2.
Department of Engineering Physics, Tsinghua University, Beijing 100084, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 91226104).

参考文献

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[8]	England T R, Rider B F 1994 Evaluation and Compilation of Fission Product Yields (Los Alamos: Los Alamos National Laboratory) LA-SUB-94-170
[9]	International Atomic Energy Agency 2000 Final Report of a Coordinated Research Project 1991-1996 (Vienna: International Atomic Energy Agency) IAEA-TECDOC-1168
[10]	Vasily S 2010 Acta Univ. Upsaliensis 723 58
[11]	Yang Y W, Liu R, Yan X S 2013 Acta Phys. Sin. 62 032801 (in Chinese) [羊奕伟, 刘荣, 严小松 2013 物理学报 62 032801]
[12]	Chouak A, Embarch K, Berrada M 1995 Appl. Radiat. Isot. 46 423
[13]	International Atomic Energy Agency 2014 Experimental Nuclear Reaction Data (EXFOR) (Vienna: International Atomic Energy Agency)
[14]	Yang Y W, Yan X S, Liu R, Lu X X, Jiang L, Wang M, Lin J F 2013 Acta Phys. Sin. 62 022801 (in Chinese) [羊奕伟, 严小松, 刘荣, 鹿心鑫, 蒋励, 王玫, 林菊芳 2013 物理学报 62 022801]
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施引文献

[1]	Leng F H, Liu X P, Li Z X, Huang L G, Wang L, Wang H Y, Zhou L Y 2011 Science Focus 6 6 (in Chinese) [冷伏海, 刘小平, 李泽霞, 黄龙光, 王林, 王海燕, 周丽英 2011 科学观察 6 6]
[2]	Peng X J 2010 J. Southwest Univ. Sci. Technol. 25 1 (in Chinese) [彭先觉 2010 西南科技大学学报 25 1]
[3]	Garlea I, Miron C, Dobrea D, Roth C, Musat T, Rosu H N 1983 Measurements of Integral Cross Sections at 14 MeV for the Following Reactions: 115In (n, n'), 197Au (n, 2n), 93Nb (n, 2n), 27Al (n, alfa), 56Fe (n, p), 235U (n, f), 239Pu (n, f), 237Np (n, f), 238U (n, f) and 232Th (n, f) (Vienna: International Atomic Energy Agency) pp1-19
[4]	Gold R, James H R, Lloyd S K, William Y M, Willian N M, Christopher C P, Robert L S 1988 Nucl. Tracks Radiat. Meas. 14 3
[5]	Anderl R A, Harker Y D 1979 Proceedings of the International Conference on Nuclear Cross Sections for Technology (Washingon: Government Printing Office) p1
[6]	Adam J, Chitra B, Katovsky K, Kumar V, Majerle M, Pronskikh V S, Khilmanovich A M, Martsynkevich B A, Zhuk I V, Golovatiouk V M, Westmeier W, Solnyshkin A A, Tsoupko-Sitnikov V M, Potapenko A S 2011 Eur. Phys. J. A 47 85
[7]	Glendenin L E, Gindler J E, Ahmad I, Henderson D J, Meadows J W 1980 Phys. Rev. C 22 152
[8]	England T R, Rider B F 1994 Evaluation and Compilation of Fission Product Yields (Los Alamos: Los Alamos National Laboratory) LA-SUB-94-170
[9]	International Atomic Energy Agency 2000 Final Report of a Coordinated Research Project 1991-1996 (Vienna: International Atomic Energy Agency) IAEA-TECDOC-1168
[10]	Vasily S 2010 Acta Univ. Upsaliensis 723 58
[11]	Yang Y W, Liu R, Yan X S 2013 Acta Phys. Sin. 62 032801 (in Chinese) [羊奕伟, 刘荣, 严小松 2013 物理学报 62 032801]
[12]	Chouak A, Embarch K, Berrada M 1995 Appl. Radiat. Isot. 46 423
[13]	International Atomic Energy Agency 2014 Experimental Nuclear Reaction Data (EXFOR) (Vienna: International Atomic Energy Agency)
[14]	Yang Y W, Yan X S, Liu R, Lu X X, Jiang L, Wang M, Lin J F 2013 Acta Phys. Sin. 62 022801 (in Chinese) [羊奕伟, 严小松, 刘荣, 鹿心鑫, 蒋励, 王玫, 林菊芳 2013 物理学报 62 022801]
[15]	Liu R, Lin L B, Wang D L, Li Y J, Jiang L, Chen S H, Wang M, Yang K 1999 Nuclear Electron. Detect. Technol. 19 428 (in Chinese) [刘荣, 林理彬, 王大伦, 励义俊, 蒋励, 陈素和, 王玫, 杨可 1999 核电子学与探测技术 19 428]
[16]	Drosg M 2000 DROSG-2000: Neutron Source Reactions (Vienna: International Atomic Energy Agency)

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