gamma particle
noun [ C ] physics specialized uk/ˈɡæm.ə ˌpɑː.tɪ.kəl/ us/ˈɡæm.ə ˌpɑːr.t̬ə.kəl/
伽玛粒子
a photon (= a unit of light) that is produced in gamma radiation (= a type of radiation with a very short wavelength that passes through most solid objects)