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.
随便看	symphonic poem symphonious symphonist symphony symphony orchestra Symphyla symphylan symphyseal symphysial symphysis symplasm symplasmic symplast symplastic symplectically symplesiomorphic symplesiomorphy sympodial sympodium symposiast symposium symptom symptomatic symptomatically symptomatology

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