第33卷 2013年
第1期 3月
核科学与工程
Nuclear Science and Engineering
Vol.33No.1
Mar.2013
利用光致裂变中子响应曲线确定铀材料丰度
朱剑钰，谢文雄
（中国工程物理研究院战略研究中心，北京100088）
摘要：用无损分析方法确定铀材料同位素丰度是深度核裁军核查技术中的一个具有挑战性的间题。本文通过分析和数值模拟研究了利用高能光子确定铀材料丰度的可能性。通过建立简化模型研究了反演轴材料丰度间题的方法、物理基础和测量条件，通过利用Monte-Carlo粒子输运程序对光子和中子的输运过程进行模拟，得到不同测量条件下的中子强度与轴材料丰度的关系。中子强度和镐材料丰度之间的关系曲线表明；对于已知结构的轴部件，轴材料丰度可以通过对比中子注量率和已知的光子中子关系曲线确定；对于未知
结构的轴部件，该部件中铀材料丰度可以通过测量中子对不同能量光子响应曲线的形状参数得到，关键词：铀同位索率度；光核反应；裂变反应；粒子输运计算
文章标志码：A
中图分类号：0571.33
文章编号：0258-0918(2012)04-0076-06
Determininguraniumenrichmentby
responsecurve ofphotoneutron
ZHU Jian-yu,XIE Wen-xiong
(Center for Strategic Studies, China Academy of Engineering Physics, Beijing 100088, China)
Abstract: Confirming uranium enrichment by nondestructive method is a challenging problem in deep nuclear disarmament verification technologies. This paper studies the feasibility of confirming uranium enrichment by high-energy photon by analysis and numerical simulation. Simplified models are established to study the method, physical basics and measuring condition of inverting uranium enrichment. The transpor processes of photon and neutron are simulated by Monte-Carlo transportation code and the relation of neutron intensity and the uranium enrichment in different conditions is
The relation curves between neutron intensity and uranium enrichment
obtained.
indicate that for uranium components of given shapes, the uranium enrichment can be obtained by comparing the neutron intensity and the known reiation curves, and for the uranium components of concealed shapes, the enrichment can be obtained by measuring the shape parameter of neutron response curve for different energy photons.
Key words: uranium enrichment; photonuclear reaction; fission reaction; particle transportation 收稿日期：2011-12-16；修日期：2012-08-24
作者简介：宋剑低(1981一），男，满族，北京人，助理研究员，博士，主要从事军控核查技术研究 76