单词	radionuclide
释义	radionuclide /ˌreɪdɪəʊˈnjuːklʌɪd / noun A radioactive nuclide.Alpha emitting radionuclides emit alpha particles, each consisting of 2 protons and 2 neutrons.... This is a partial list of radionuclides that decay by positron emission and have been used in biomedical imaging studies. Gamma radiation from medically useful radionuclides is substantially attenuated by 1 to 2 inches of lead.
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