This paper reports the influence of a radiostrontium decorporating agents
S186 (calcium sodium N- acetylproplysmine 1
1- diphosphonate)
on trace elements in internal organs of dogs. The trace elements contents were determined with a PE- 3030 atomic absorption spectrophotometer. Compared with the control group
the trace elements (Cu
Zn and Mn) contents and the Cu/ Zn ratio in organs of Beagle dogs after intramuscular injection of S186 for 30 days did not change obviously except the Cu content in the liver increased.