Re: In-111

[carol marcus <csmarcus@ucla.edu>]

At 11:25 AM 7/10/98 -0500, you wrote:
>Dear Radsafers:
>
>I'm looking for information on In-111.  Gamma Ray Constant and Skin Dose
>Conversion Factor if there is one.  So far, I've had trouble locating
>this info.  Could someone help me out.  Thanks in advance
>
>--
><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
>James P. Abraham
>Alt. Radiation Safety Officer
>Radiation Control Office - Colorado State University
>133 General Services Building - Fort Collins, Colorado 80523-6021
>
>Phone:  (970) 491-3928    Fax:  (970) 491-4804
>Email:   jimabe@lamar.colostate.edu
><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
>
>Dear James:

The specific gamma ray constant for any radionuclide in an FDA-approved
radiopharmaceutical is, believe it or not, in the FDA-approved package
insert.  The one for Sm-153 is wrong and is being fixed.  The one for In-111
is 3.21 R/hr per mCi at 1 cm.  The first half-value thickness for Pb is
0.023 cm.  The use of 0.834 cm of Pb will decrease the external radiation
exposure by a factor of about 1000.  That is in the package insert as well;
I copied it out of the ProstaScint package insert.

Ciao, Carol

Carol S. Marcus, Ph.D., M.D.
<csmarcus@ucla.edu>
>