Tritium is one of the mildest radioactive isotopes.

氚是辐射最和缓的放射性同位之一。

There are 37 lectures, major headings are geochronology, radiogenic isotope geochemistry and stable isotope geochemistry.

这里有37讲，主要是地质年代、放射性同位地和稳定同位地。

A series of tracer experiments using P32 as a tagger and the radioautography had been carried out.

应用P32放射性同位示踪试验和鱼体放射自显影,证实白鲫鱼种可以摄食和消利用水绵。