Mankhwalawa ali ndi ubwino wotsutsa nyengo. Ili ndi mphamvu yoletsa dzimbiri kapena kuwonongeka kwamtundu uliwonse chifukwa chokhala ndi nthawi yayitali kumadera ovuta komanso nyengo.
Chogulitsacho chimakhala ndi mphamvu yochepa ya chilengedwe kupyolera mu moyo wake wonse. Sichipanga mankhwala aliwonse a radioactive omwe angawononge anthu komanso chilengedwe.
Chogulitsacho chimakhala ndi kuyamwa kwakukulu kwamadzi. Ikhoza kuyamwa kuchuluka kwa madzi pansi pamikhalidwe yodziwika monga kutentha ndi kutalika kwa nthawi.