Study of Radioactivity Measurement Using Well Type NaI(Tl) γ Spectrometer

摘要

<正>Using a well type NaI（Tl）gamma spectrometer,the radioactivity of 125I was measured with absolute measurement method.125I radioactive source was prepared with the same batch of radioactive solution,and its activity range is 102-104 Bq.By different strength activity measurement