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为了测定聚变-裂变反应堆模型钍包层中的钍俘获率以及钍-铀转化率, 探索了一种新的钍活化离线γ测量法. 利用测量232Th俘获反应产物233Th衰变链中233Pa衰变放出的311.98 keV 特征γ射线, 来反推计算并最终确定232Th(n,γ)233Th的反应率, 测试实验中不确定度约6% (233Th/232Th量级为10-17情况下). 详细介绍了此方法的背景和原理方法, 并进行简单的校验实验, 证明其能够较好地得到模拟装置中的俘获率. 与瞬发γ测量法以及质谱分析法进行对比, 本方法更适合用于聚变-裂变反应堆模型钍包层中的钍俘获率以及钍-铀转化率测量, 并有望进一步测量其他相关参数.To determine the thorium capture ratio and thorium-uranium conversion ratio in the thorium cladding of the fusion-fission reactor model, a new approach, activated thorium sample decay γ -ray off-line measurement, is introduced in this paper. This method is based on the measurement of the 311.98 keV characteristic decay γ-ray emitted by 233Pa which is produced through decay of 233Th, the capture product of 232Th. Then some reverse mathematic approach is brought in and finally the 232Th (n, γ ) 233Th reaction ratio is determined, with an uncertainty of 6% in the test experiment (233Th/232Th under the order of magnitude 10-17). In the paper, we introduce the detail of the approach including the background, principle and the result of a simple test experiment which shows that this approach can work well in thorium capture ratio determination. Compared with prompt γ-ray method and mass spectrometer method, this decay γ-ray off-line method has many advantages in determining the thorium capture ratio and thorium-uranium conversion ratio in the thorium cladding. It is also promising in the measurement of other relevant parameters.
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Keywords:
- thorium /
- capture ratio /
- off-line measurement
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[1] Schillebeeckx P, Trkov A 2006 Summary Report of the 3rd Research Coordination Meeting, Rep, 2006 p1
[2] Bringer O, Isnard H, AlMahamid I, Chartier F, Letourneau A 2008 Nucl. Instr. Meth. A 591 510
[3] Baek W Y, Kim G N, Cho M H, Ko I S, Namkung W, Grigoriev Yu V, Faikov-Stanczyk H, Shvetshov V N, Furman W I 2000 Nucl. Instr. Meth. B 168 453
[4] Hill M W 1958 Ph. D. Dissertation (California Univ.)
[5] Albridge R G, Hollander J M, Gallagher C J, Hamilton J H 1961 Nucl. Phys. 27 529
[6] Zhu T H, Liu R, Jiang L, Lu X X, Wen Z W, Wang M, Lin J F 2007 Nucl. Elec. Tron. Dect. Tech. 27 141 [朱通华, 刘荣, 蒋励, 鹿心鑫, 温中伟, 王梅, 林菊芳 2007 核电子学与探测技术 27 141]
[7] Liu R, Lu X X, An L 2009 Physics 12 889 (in Chinese) [刘荣, 鹿心鑫, 安力 2009 物理 12 889]
[8] Lu X D, Tian D F, Xie D 2004 Nucl. Instr. Meth. A 519 647
[9] Vockenhuber C, Ahmad I, Golser R, Kutschera W, Liechtenstein V, Priller A, Steier P, Winkler S 2003 Int. J. Mass. Spectrom. 223-224 713
[10] Zhou W J, Lu X F, Wu Z K, Zhao W N, Huang C H, Li L L, Cheng P 2007 Nucl. Tech. 30 702 (in Chinese) [周卫健, 卢雪峰, 武振坤, 赵稳年, 黄春海, 李琳琅, 程鹏 2007 核技术 30 702]
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