Distributions of Nuclear Reaction Products in Natural Substances

1. 宇宙成因的^<10>Be, ^<14>C和^<26>Al已经用AMS方法在天然产物中，特别是在陨石中进行了测定。球粒陨石中金属相的分离纯化得到了广泛的发展，可以直接比较金属中^<10>Be和^<26>Al的含量与硅酸盐中的含量。用中子活化法测定了铁陨石中宇宙成因的^<45>Sc。至于^<107亿美元，该项目仍在进行中。^<53>Mn的测定尚未开始。综合上述结果和其他数据，就可以对陨石中的宇宙成因产物进行全面调查。从质量损失、δ A和有效δ A三个方面对散裂产物的生产速率进行了系统的研究。

1. Determinations for cosmogenic ^<10>Be, ^<14>C and ^<26>Al have been performed by AMS methods in natural products, espceially in meteorites.2. Separation and purification of metal phases in chondrites have been developed extensively, and the contents of ^<10>Be and ^<26>Al in metals and those in silicates can be compared directly.3. By neutron activation methods, cosmogenic ^<45>Sc in iron meterorites has been determined. As for ^<107>Ag the project is still on the way. The determination for ^<53>Mn has not been started yet.4. Compiling above results along with other data, a comprehensive survey on cosmogenic products in meteorites became available. A systematic study on the production rates of spallation products was extended in terms of mass losses, delta A, and effective delta A.