【摘要】 铀材料的辐射探测方法是核查技术研究的重要内容,主动法是铀材料探测的有效方法之一。论文利用MCNP程序计算分析了活化法区分浓缩铀和贫化铀的可行性,研究表明通过铀材料的裂变率-慢化体厚度的关系曲线能够判断是贫化铀还是浓缩铀。计算分析了252Cf和14MeV中子源在铀材料探测中的优缺点,结果表明252Cf中子源优于14MeV中子源。最后从测量的角度,重点分析了探测对象——缓发γ射线和缓发中子,分析表明探测缓发中子优于缓发γ射线。更多还原

【Abstract】 Detecting uranium material is an important work in arms control.Active detection is an efficient method for uranium material.The paper focuses on the feasibility that can distinguish the enriched uranium and the depleted uranium by MCNP program.It can distinguish the enriched uranium and the depleted uranium by the curve of relationship between fission rate of uranium material and thickness of moderator.Advantages of 252Cf and 14MeV neutron sources are discussed in detecting uranium material through calculation.The results show that 252Cf neutron source is better than 14MeV one.Delayed neutrons are more easily detected than delayed gamma ray at measurement aspect.更多还原