Tritium is one of the mildest radioactive isotopes.

氚是辐最和缓的性同位素之一。

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、性同位素地球和稳定同位素地球。

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

应用P32性同位素进行示踪试验和鱼体显影,证实白鲫鱼种可以摄食和消利用水绵。