[ RadSafe ] Linearity with Tc99m shortage?

[Diane Griffiths]

I know we have discussed that hospitals can't get the Tc99m for patient 
studies, this brings me to another question.. How can we do linearity on the 
Dose Calibrators?

I have two locations where the linearity is due by the end of this month, 
and they can't get any Tc99m at all. They have switched their cardiac 
procedures to Thallium until the shortage is over.

Diane