Tritium is one of the mildest radioactive isotopes.

氚是辐最缓的放位素之一。

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

这里有37讲，主要是地质年代学、放位素地球学稳定位素地球学。

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

应用P32放位素进行示踪试体放自显影,证实白鲫种可以摄食消利用水绵。