Abstract: The data of the transportation and use of radioactive sources as well as their packages for well logging used in oil (gas) fields were collected. At present, there were more than 60 organizations in China that use well logging sources. There were approximately 3 340 well logging sources, in which 697 sources belong to Class II radioactive materials. And there were 126 types of packaging for those 697 sources. Investigation has found that 40% of the well logging sources have expired service. Only 22.5% of packaging had been registered. The surface doses of some packages approach 7 times of the limits specified by national standard. The well logging operations were also not quite standardized. Suggestions were put forward to these problems.

Key words: well logging, radioactive sources, transport