The Air Kerma Rate of 125I sources is determined by the well-type ionization chamber.Thereafter the apparent activity of 125I sources is calculated and measured results are anylyzed.

采用井型电离室测定125I粒子源的空气比释动能率，进而估算出125I粒子源的表观活度（又称等效活度），并对结果进行了分析。