[ RadSafe ] Activity versus dose/exposure

Thu Jun 23 10:47:20 CDT 2011

Let's say it is a brand new source this is being made for a start-up
source. The activity is what it is 304 milli-curies at the time of
delivery.

-----Original Message-----
From: radsafe-bounces at agni.phys.iit.edu
[mailto:radsafe-bounces at agni.phys.iit.edu] On Behalf Of Dustin G. Miller
Sent: Thursday, June 23, 2011 11:35 AM
To: 'The International Radiation Protection (Health Physics) Mailing
List'
Subject: Re: [ RadSafe ] Activity versus dose/exposure

A few questions come to mind in addition to Dewey Thompson's.

How old is the dose information from the manufacturer?  

How old is the Cf-252 source.  If the Cf-252 has been in the stainless
steel
(SS) capsule for a period of time, there may be enough activation of the
SS
that it is increasing the gamma dose rate, i.e. Co-60.

Dustin Miller

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Rouse, Raymond
Lawrence
Sent: Thursday, June 23, 2011 11:14 AM
To: The International Radiation Protection (Health Physics) MailingList
Subject: Re: [ RadSafe ] Activity versus dose/exposure

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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