壊変 かいへん Meanings Noun, する verb (radioactive) decay; disintegration See also: 崩壊 (ほうかい). Kanji 壊 destroy. Read as カイ. 変 change. Read as ヘン. Words containing 壊変 壊変毎分 (かいへんまいふん) disintegration per minute 放射壊変 (ほうしゃかいへん) radioactive decay 壊変毎秒 (かいへんまいびょう) decays per second Word lists Physics Jinuma: Japanese Dictionary · Word lists