[ RadSafe ] Internal Dosimetry and FGR 11

Cindy Bloom radbloom at comcast.net
Fri Jan 30 21:33:08 CST 2009


You correctly express the process in going from an in vivo (or in vitro for 
that matter) measurement, which gives the radioactive content of an organ 
(or a compartment) at some point in time, to intake, which is the amount of 
radioactivity initially taken into the body (e.g., inhaled, ingested, 
etc.), during some prior period or moment.  I think that your use of the 
term "uptake" might not be quite right;  I would feel more comfortable 
substituting the word, "content."

Happy calculating,


At 05:17 PM 1/30/2009 -0600, you wrote:
>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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