An irradiation of 60 sec. limits the build - up of excessive gamma radiation levels.采取60秒辐射限定了剩余伽玛射线水平的增高.However the major portion of the initial gamma radiation is derived from the two latter sources.可是绝大部分早期γ辐射来自后两种来源...

伽玛辐射...

gamma radiation的音标：gamma radiation的英式发音音标为：['ɡæmə ˌreidi'eiʃən]gamma radiation的美式发音音标为：['ɡæmə ˌredi'eʃən]...