Word

HSK	Not in HSK
FREQUENCY	Unknown

放射性衰變 fàng shè xìng shuāi biàn

放 fàng HSK 3	put, release, free, liberate
射 shè HSK 5	shoot, eject, issue forth, emit
性 xìng HSK 4	nature, character, sex
衰 shuāi HSK 6	decline, falter, decrease; weaken
變 biàn	change, transform, alter; rebel