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Re: Specific Gamma Ray Constant for Ra-226
Hi:
The 0.825 R/hr at 1 meter per Ci is the classic gamma exposure from a Ci of Ra-
226 [in equilibrium with all the Ra-226 daughters] in a sealed source filtered by
0.5 mm Pt . In this case Ra-226 contributes only about 1.2% of all gamma rays
emitted, and at a lower average gamma energy than any of the other gamma rays
from the Ra-226 daughters.
The 2nd figure you give is just for the gamma exposure from a Ci of Ra-226 itself
with no daughter contribution to the gamma exposure rate.
Stewart Farber, MSPH
====================
3/3/03 5:14:27 PM, Toli Mikell <tmikell@EXCITE.COM> wrote:
>
> While researching the specific gamma ray constant for radium-226, I noticed
>
> two different figures, 0.825 R/hr at 1m/Ci and 0.0121138 R/hr at 1m/Ci. Can
> someone provide some clarity on this for me? The issue in question is about
> Ra-226 needles. You may respond privately at tmikell@excite.com.
>
> Thanks,
>
>
> Toli Mikell
>
>
>
>
>
>
>
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