钚同位素成分及总质量测量的可行性探讨

Feasibility Analysis on Isotopic Composition and Mass Measurement for Plutonium

利用MCNP4B程序,通过一个实例探讨了钚的同位素成分及总质量测量的理论可行性.首先利用假想的γ射线源确定出不同能量γ射线穿透容器的相对效率曲线;然后将实际的钚样品放入容器,通过容器外各种特征γ射线强度的测量可以推算出钚的同位素成分;最后测量出系统总中子泄漏数,便可求得钚的总质量.

One possible method of measurement of isotopic composition and mass for plutonium is discussed and its feasibility in theory is demonstrated by the MCNP4B package in this paper. The relative efficiency ratio curve for the container where the plutonium sample is put in can be computed by assigning an arbitrary γ ray source in the sample . Once the relative efficiency ratio for the container is known, the isotopic components for plutonium can be induced by assigning the real γ ray source in the sample and analyzing the characteristic γ ray intensity outside the container. Furthermore, if the total neutron counts outside the container is known, the total mass of plutonium in the sample can be estimated. 