[ RadSafe ] Internal Dosimetry and FGR 11 -- NUREG/CR-4884

Cary Renquist cary.renquist at ezag.com
Mon Feb 2 16:44:51 CST 2009

I recall that there are some issues with NUREG/CR-4884, but I don't
recall what they are...

My recollection is that there were some incorrect fecal excretions
models applied, but I  don't recall if it only influenced the fecal
excretion tables or if it influenced other tables as well.

Anybody with a better memory?   
(I have a mind like a steel trap -- rusty, dangerous, and illegal in 30+

Thanks, for any info.

Cary Renquist
cary.renquist at ezag.com

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
Behalf Of alstonchris at netscape.net
Sent: Monday, 02 February, 2009 13:20
To: Daren.Perrero at illinois.gov; radsafe at radlab.nl
Subject: Re: [ RadSafe ] Internal Dosimetry and FGR 11


Yes, you are absolutely correct.? That's why references like
NUREG/CR-4884 give you the Intake Retention Fractions (IRF's) at
specified times post-intake; so that you can back-calculate from your
estimate of "body-burden," to an estimate of how much the original
intake would have been.


-----Original Message-----
From: Perrero, Daren <Daren.Perrero at illinois.gov>
To: radsafe at radlab.nl
Sent: Fri, 30 Jan 2009 6:17 pm
Subject: [ RadSafe ] Internal Dosimetry and FGR 11

Can someone out there help clarify an issue for me and reinforce my
notion that there's no such thing as a dumb question?  

FGR 11 is based on modeling from ICRP 30.  In specific Tables 2.1 and
2.2 in that document provides estimates of committed dose equivalents
for INTAKES (my emphasis added) of various radionuclides.  The term
INTAKE in this context does NOT mean the amount of material measured
in-vivo in an organ such as the breast, lung, or thyroid.   The in-vivo
measurement, or UPTAKE, needs to be converted to INTAKE in order to
apply the values found in FGR 11.  Intakes can be estimated by using a
reference such as NUREG/CR-4884 if the interval between the date of the
event and the measurement is known.  

Is my understanding correct or am I making this harder than it needs to

Daren Perrero
The opinions expressed are mine, all mine....
I'm with the government, I'm here to help you.

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