Re: Samarium-153 -Reply

["Russ Meyer" <CMEYER@brc1.tdh.texas.gov>]

> Date:          Wed, 8 Feb 95 13:07:49 -0600
> Reply-to:      radsafe@romulus.ehs.uiuc.edu
> From:          FRAMEP@orau.gov
> To:            Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
> Subject:       Re: Samarium-153 -Reply

>
> Salutations from the frozen tundra (at least for today) of the
> southern U.S.
>
> Warning wrt the following message:
>
> >The Rad Health Handbook (Revised Ed., 1992) has it as 2.440E-5
> >(mSv/h)/MBq (mu in cm-1).
>
> A gamma constant has to include a distance squared term. For the
> above value it is meters squared.  i.e. the constant is in
> mSv/hr at 1 meter from a megabecquerel source
>
> The table from which the number comes also includes mu in cm-1 but
> that is unrelated to the gamma constant units. The table was a
> summary of data in  an Unger and Trubey ORNL document  RSIC-45/R1.
> 1982
>
> Regards
>
> Paul Frame

what about air attenuation?  for most higher energy x and gamma
radiation mu for air can be ignored.  but it might be
significant for very low energy photons. neh?>

Russ
cmeyer@brc1.tdh.texas.gov
(512)834-6688