[ RadSafe ] Activity versus dose/exposure

Thu Jun 23 13:31:30 CDT 2011

Hey Jim,

The manufacture gave us the dose rates we should see when we receive
this source, neutron dose rates and gamma dose rates. We were double
checking their math and the neutron was right but when we checked the
gamma out using the gamma constant from the Radiological Health Handbook
Chapter 6 1992 Revised Edition author Schleien. We assumed he gamma
constant would include the contributions from all the fission products.

Doing some research I found a paper by Knauer and Balo. In this paper
they cite a rule of thumb .0019 mSv/hr per micro-gram of Cf-252. When I
plug in the numbers for this I am coming real close to what the
manufacture provided me. 

Anyone

-----Original Message-----
From: radsafe-bounces at agni.phys.iit.edu
[mailto:radsafe-bounces at agni.phys.iit.edu] On Behalf Of Jim Hardeman
Sent: Thursday, June 23, 2011 1:32 PM
To: The International Radiation Protection (Health Physics) MailingList;
The International Radiation Protection (Health Physics) MailingList
Subject: Re: [ RadSafe ] Activity versus dose/exposure

Raymond --

Is the manufacturer quoting total dose rate (i.e. gamma + neutron) or
just gamma, which is what you would be calculating with the gamma
constant below?

Is it safe to assume that the gamma constant for Cf-252 includes the
contributions from all of the fission products resulting from
spontaneous fission?

Jim Hardeman, Manager
Environmental Radiation Program
Environmental Protection Division
Georgia Department of Natural Resources
4220 International Parkway, Suite 100
Atlanta, GA 30354
(404) 362-2675
Fax: (404) 362-2653
Personal fax: (404) 521-4485
E-mail: Jim.Hardeman at dnr.state.ga.us 

>>> "Rouse, Raymond Lawrence" <rlrouse at tva.gov> 6/23/2011 11:13 >>>
OK all you radsafers,

A colleague and I were working on a problem earlier yesterday when this
post came out.

Calculate the 30 cm reading from a 304 milli-curie Cf-252 source. We
used the gamma constant of 1.131 e-5. We came up with the same dose
rate,  here is the problem it was 10 times less then what the
manufacture is telling us. So we decided to used micro-shield program
and that number was even smaller than what we came up with - much
smaller.

Anyone care to take a stab at this?

Raymond Rouse
Health Physicist
Watts Bar Nuclear Plant
PO Box 2000
Spring City, Tn 37381
(423)-365-1881
rlrouse at tva.gov 

----- 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
3922 Wood Hall
Western Michigan University
1903 W. Michigan Ave.
Kalamazoo, MI  49008-5410

Office (269) 387-5933
Cell  (269) 744-0996
E-mail: john.center at wmich.edu 
Fax  (269) 387-5888
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