gamma radiation       
noun [ U ]  physics uk/ˌɡæm.ə reɪ.diˈeɪ.ʃən/ us/ˌɡæm.ə reɪ.diˈeɪ.ʃən/
 γ辐射
a type of radiation with a very short wavelength that passes through most solid objects
 See also: gamma
 
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