Rare earth can influence for shape size,distribution and quantity of niobium carbonide,decrease activity of carbon and niobium i...

稀土对碳化铌形态、大小、分布、有影响,可降低碳、铌活度,阻碍碳化铌在奥氏体的析出。

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。