Abstract
The residual activities present in spent 99Mo-99mTc generators and 81Rb-81mKr generators were determined from a view point of the disposal of radiopharmaceuticals. The results showed that seven kinds of residual nuclides such as 95Zr-95Nb, 103Ru, 90Sr, etc. were found in 99mTc generators with maximum level of 740 Bq/3.7 GBq (0.02 muCi/100 mCi) at one year after the reference date. In 81mKr generators one year old, six nuclides such as 57Co, 83Rb, 84Rb and others remained and these activities were less than 3.7 kBq/370 MBq (0.1 muCi/10 mCi). On the basis of these data, the disposal of 99mTc generators and 81mKr generators is discussed.
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