[ RadSafe ] Activity versus dose/exposure

[Mark Ramsay]

Or may be in SI units

D (micro Sv /h) = ME/ 6r2

Where M is activity in MBq

E is energy in MeV

r is distance in m.

You can add an 'f' term as well to account for probability for energy decay and then sum .

Rgs

Mark



Sent from my iPhone

On 22 Jun 2011, at 18:55, "Thompson, Dewey L" <DThompson3 at ameren.com> wrote:

> John, you might also be able to get away with the old standby "6CEN" if you don't have a book or internet handy.
> 
> 6 x the Curie Content x the photon energy in MEV x the abundance = R/hr @ 1 foot.  Divide by distance squared corrects the estimate for distance. 
> 
> Dewey
> 
> : : : : : : : : : : : : : : : : : : : : : : : : : 
> DEWEY THOMPSON 
> Staff HP
> Radiation Protection Department
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> 
> -----Original Message-----
> From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of John Gerald Center, Jr
> Sent: Wednesday, June 22, 2011 11:42 AM
> To: The International Radiation Protection (Health Physics) Mailing List
> Subject: Re: [ RadSafe ] Activity versus dose/exposure
> 
> Thank you all,
> 
> This is one of the many reasons I signed up for RadSafe.  Quick help when my brain shuts down and interesting debate on topics of radiation safety.
> 
> Still glad to be a part of this list,
> 
> John
> 
> ----- Original Message -----
>> From: "Carol Marcus" <csmarcus at ucla.edu>
>> To: "The International Radiation Protection (Health Physics) Mailing List" <radsafe at agni.phys.iit.edu>, "The
>> International Radiation Protection (Health Physics) Mailing List" <radsafe at agni.phys.iit.edu>
>> Sent: Wednesday, June 22, 2011 12:22:54 PM
>> Subject: Re: [ RadSafe ] Activity versus dose/exposure
>> Dear John:
>> 
>> It's called the "Specific Gamma-ray Dose Constant" and you can find a
>> table of them on pp 6-10 to 6-14 in the third edition (1998) of
>> Schleien, Slaback, and Birky's "Handbook of Health Physics and
>> Radiological Health".
>> 
>> Carol S. Marcus, Ph.D., M.D.
>> Depts. of Radiation Oncology and of Radiological Sciences
>> David Geffen School of Medicine at UCLA
>> 
> -- 
> John G. Center, Jr.
> Radiation Safety Officer
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