伽玛射线

jiā mǎ shè xiàn

gamma ray (loanword)

伽

jiā

traditionally used as phonetic for "ga"

玛

mǎ

used in 瑪瑙|玛瑙[ma3 nao3]

射

shè

to shoot

线

xiàn

variant of 線|线[xian4]