【日本《原子能安全性研究的现状》1981年9月24日第104页报道】在日本以及其它国家,建设了从后处理工序排出的废气中回收氪的设施。要使回收的氪(其中含有百分之几的放射性~(85)Kr)的放射性降到十分低,就必须贮藏数十年,乃至上百年。氪是惰性气体,用化学方法捕集是困难的,但 [Japan’s “The State of Atomic Energy Research,” September 24, 1981, p. 104] In Japan and other countries, facilities for recovering plutonium from exhaust gas discharged from post-processing processes have been constructed. To reduce the radioactivity of the recovered helium (which contains several percent of radioactive ~ (85) Kr) to very low levels, it must be stored for decades, or even hundreds of years. Helium is an inert gas and it is difficult to capture chemically, but