Re: internal dose in Nuclear Medicine

["Kenneth Douglass" <KDOUGLAS@WVUHSC1.HSC.WVU.EDU>]

Al,

The toxicity of Technecium or Ruthenium is all but irrelevant. 10 mCi 
of Tc-99m has a mass of 1.8E-9 gm so the mass of Tc injected is 
actually extremely small (even allowing for carrier Tc-99). That is why high specific activity is 
important for radiopharmaceuticals. 

Ken
Kenneth H. Douglass, Ph.D.
Director, Radiation Safety
West Virginia University
West Virginia University Hospitals
PO Box 9006
Morgantown WV 26506
(304) 293-1549
(304) 293-4529 (fax)
kdouglas@wvu.edu