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铍装置泄漏中子倍增率用全吸收方法测量。全吸收探测器有去离子水和聚乙烯球两种,它们的半径分别为75cm和69cm。测量球内中子分布的探测器是~(235)U裂变室,对相对和效率刻度两种测量方法的结果进行了比较,仔细分析了实验误差的主要来源。对于厚度为4.55,8.4O,1O.45和14.85cm的四种铍球壳,已经得到了两种全吸收剂和两种测量方法的中子倍增率实验结果,其结果在误差范围内是一致的。与1-DANISN程序的计算值进行了比较,对于ENDF/B-Ⅳ和ENDF/B-Ⅵ库数据,实验值比计算值分别低3％～14％和1％～7％。
Beryllium leakage neutron multiplication rate measured by the total absorption method. Total absorption detector has two kinds of deionized water and polyethylene balls, their radius was 75cm and 69cm. The detector for measuring the distribution of neutrons in the sphere is the ~ (235) U fission chamber. The results of the two measurement methods, relative and efficiency, are compared and the main sources of experimental error are carefully analyzed. For the four beryllium spheres with thickness of 4.55,8.4O, 1O.45 and 14.85cm, the experimental results of neutron doubling rate of two total absorbents and two measuring methods have been obtained, and the results are consistent within the error range of. Compared with the calculated value of 1-DANISN program, the experimental data of ENDF / B-Ⅳ and ENDF / B-Ⅵ data are 3% ~ 14% and 1% ~ 7% lower than the calculated values, respectively.