Determination of 235U isotope abundance by difference method of fission yield

QIAO Yahua; CHEN Haiying; ZHANG Min; YANG Yi; LIU Shilong; WU Jizong

doi:10.11889/j.0253-3219.2014.hjs.37.030204

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Determination of 235U isotope abundance by difference method of fission yield

更新时间：2021-03-03

- Determination of 235U isotope abundance by difference method of fission yield
- NUCLEAR TECHNIQUES Vol. 37, Issue 3, Article number: 030204(2014)
- 作者机构：
  
  1. 环境保护部核与辐射安全中心,北京,100082
  2. 中国原子能科学研究院,北京,102413
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2014.hjs.37.030204
  CLC：
- Published：14 March 2014
- 稿件说明：
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QIAO Yahua, CHEN Haiying, ZHANG Min, et al. Determination of 235U isotope abundance by difference method of fission yield[J]. Nuclear techniques, 2014, 37(3): 030204
DOI：

QIAO Yahua, CHEN Haiying, ZHANG Min, et al. Determination of 235U isotope abundance by difference method of fission yield[J]. Nuclear techniques, 2014, 37(3): 030204 DOI： 10.11889/j.0253-3219.2014.hjs.37.030204.

摘要

利用裂变产额差异法，从裂变产额质量分布曲线，选取位于双驼峰曲线两翼的裂变产物的产额随可裂变核素的不同有很大变化的核素88Rb、104Tc和92Sr作为测量对象，选择平均裂变产额比 / 、 / 为监测对象，研究了平均产额比与铀丰度之间的关系曲线，获得了平均产额比随丰度H0变化的关系式。利用两条关系曲线分别对72.2%的模拟样品测量5次，RSD均优于2%。将样品分析结果与无源γ射线法的结果相比较，两种方法在规定的误差范围内结果是一致的。

Abstract

Background: Determination of the uranium isotope abundance ratio of fuel pins is a significant stage for the quality control in safe operations of reactor. Purpose: The aim is to establish a method to examine the 235U abundance of fuel rod with fast neutron as an excitation source. Methods: Taking the fission-yield ratios of / and / as the subjects of research

the relation curves between the average yield ratios and the 235U isotopic abundance as well as the expressions

in which the average yield ratio ( ) is a function of the 235U isotopic abundance (H0)

were obtained and presented based on the previous studies. Results: In order to testify the accuracy of the method

the simulation sample of 72.2% is measured by working curve

and RSD is less than 2%. Within the limit of error

the results of sample analysis are in correspondence with those of passive gamma ray method. Conclusion: All of these results indicate that the method is feasible to determine the 235U abundance of fuel rod.Cited

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GONG Jian HUANG Ling

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Institute of Nuclear Physics & Chemistry of CAEP

中国工程物理研究院核物理与化学研究所

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