Failure of Y90 to Escape from Skeletally-Fixed Sr.90

Abstract

A young dog was given Sr90 and sacrificed 4 months later. Serial radioautographs, energy discriminating beta ray measurements, and Bremsstrahlung X-ray measurements on whole and dissected bones indicated that the retention of the Y90 born from the Sr90 in whole and individual areas of bone was virtually complete. Apparently the Y90 atoms born of Sr90 decay remain locally in precisely the same area of bone in which they are produced. The radio-toxicological importance of this finding is indicated.