cloud chamber
(physics 物) device containing vapour in which the paths of charged particles, X-rays and gamma rays can be observed by the trail of tiny drops of condensed vapour they produce 云室(一種含飽和水蒸氣的輻射探測(cè)器, 遇有粒子、 X射線(xiàn)和伽馬射線(xiàn)通過(guò)時(shí), 可形成凝結(jié)的細(xì)小水滴的徑跡).