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在钚的来源分析中,同位素组成和材料的年龄信息至关重要。钚样品的年龄是基于钚的同位素及其子体,即238Pu/234U、239Pu/235U、240Pu/236U和241Pu/241Am的原子比进行测定的。由于钚样品受天然本底中236U、241Am的污染干扰远小于234U、235U,故240Pu/236U和241Pu/241Am的原子比常用于钚年龄的测定。通常所能获得的钚样品量较少,甚至是微米级的微粒,为此,本工作研究建立了痕量钚样品的年龄测定技术,这将对核取证学及核保障等具有重要的意义。
In the source analysis of plutonium, isotopic composition and age information of the material are of crucial importance. The age of the plutonium sample was determined based on the atomic ratio of plutonium isotopes and their daughters, ie 238Pu / 234U, 239Pu / 235U, 240Pu / 236U and 241Pu / 241Am. The atomic ratio of 240Pu / 236U and 241Pu / 241Am is commonly used for the determination of the age of plutonium since the interference of plutonium samples with 236U and 241Am in natural background is far less than 234U and 235U. Generally, there are few plutonium samples available and even micron-sized particles. Therefore, this work established the age determination technique for trace amounts of plutonium samples, which will be of great significance to nuclear forensics and nuclear protection.