On the other hand, analyses of 85 Kr, a fission product of uranium-235 and plutonium-239, can serve as a means to help verify compliance with the Nuclear Non-Proliferation Treaty.

• 另一方面；氪-85是铀-235和钋-239的核裂变产物.；对氪-85的同位素含量测定可以用于监督国际核公约的执行情况