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Re: Natural and Background radiation
"Johansen.Kjell" wrote:
>
> Concerning the need for hundreds of TLDs to accurately determine the TMI
> dose - NO, NOT NEEDED. The dose from the emitted noble gases came from both
> beta and gamma emissions. The range of gammas in air is quite large so that
> the TLD does not have to be "touched" by the plume in order to measure a
> dose. I don't have the info in front of me at the moment so the number I'm
> about to quote may not be exactly correct. But, I do remember calculating
> the half-value layer of a 662 KeV gamma (Cs-137) in air and it was on the
> order of several thousand feet. The number 2200 comes to mind but I'm not
> exactly sure.
>
Also, the lack of "100s of TLDs" was partly compensated for by wide area
sampling of unexposed photo film. If I recall correctly, the Kemeny Commission
Report identified the numbers, locations, and their 'sensitivity' to the
proposed levels of concern by critics.
Regards, Jim
muckerheide@mediaone.net
Radiation, Science, and Health
==============================
> As always, just my own thoughts.
>
> Kjell Johansen, Ph.D.
> Wisconsin Electric Power Company
> Milwaukee
> kjell.johansen@wepco.com
>
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> <P><FONT SIZE=3D2 FACE=3D"Arial">With regard to the use of natural gas, =
> according to NCRP report (# 94?) there is an estimated dose of of 5 =
> mrem per year from using natural gas due to the radon in the =
> gas.</FONT></P>
>
> <P><FONT SIZE=3D2 FACE=3D"Arial">Concerning the need for hundreds of =
> TLDs to accurately determine the TMI dose - NO, NOT NEEDED. The =
> dose from the emitted noble gases came from both beta and gamma =
> emissions. The range of gammas in air is quite large so that the =
> TLD does not have to be "touched" by the plume in order to =
> measure a dose. I don't have the info in front of me at the =
> moment so the number I'm about to quote may not be exactly correct. =
> But, I do remember calculating the half-value layer of a 662 KeV gamma =
> (Cs-137) in air and it was on the order of several thousand feet. =
> The number 2200 comes to mind but I'm not exactly sure.</FONT></P>
>
> <P><FONT SIZE=3D2 FACE=3D"Arial">As always, just my own =
> thoughts.</FONT>
> </P>
>
> <P><FONT SIZE=3D2 FACE=3D"Arial">Kjell Johansen, Ph.D.</FONT>
> <BR><FONT SIZE=3D2 FACE=3D"Arial">Wisconsin Electric Power =
> Company</FONT>
> <BR><FONT SIZE=3D2 FACE=3D"Arial">Milwaukee</FONT>
> <BR><FONT SIZE=3D2 FACE=3D"Arial">kjell.johansen@wepco.com</FONT>
> </P>
>
> </BODY>
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