Re: Radionuclide impurities in Therapeutic Dosages

[Ccja@aol.com]

It is molybdenum99, the parent, that can be eluted along with Tc99m under
some conditions. There are regulations controlling the percentage of moly99
that can be present in a dose (cf. 10CFR35). Since  Tc99 has such a long
halflife, it's hard to see how there could be significant ingrowth, outside
of a reactor. In any event, the question is about therapeutic dosages. I know
of no therapeutic uses of Tc99m.

Chris Alston