[ RadSafe ] Fwd: Effective half life question

Thu Oct 25 11:49:11 CDT 2012

Some interesting information on tritium and low-level Beta emitters here:
http://ec.europa.eu/energy/nuclear/radiation_protection/doc/publication/152.pdf

specifically, one of the contributors discusses biological half-life of tritium: it ain't that simple!

Regards
Doug

Doug Aitken
QHSE Advisor, Schlumberger D&M Operations Support
Cell Phone: 713-562-8585
(alternate e-mail: doug.aitken at slb.com )
Mail: c/o Therese Wigzell,
Schlumberger,
Drilling & Measurements HQ,
300 Schlumberger Drive, MD15,
Sugar Land, Texas 77478

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Brennan, Mike (DOH)
Sent: Thursday, October 25, 2012 11:23 AM
To: The International Radiation Protection (Health Physics) MailingList
Subject: Re: [ RadSafe ] Fwd: Effective half life question

H-3 is even a clearer example.  Assuming the tritium enters the body as water (usually valid), the biological half life is about 13 days, compared to the radiological half life of over 12 years.  The biological half life can be even less with the consumption of large quantities of beer (OK, other liquids will work, also, but why wouldn't you use beer?)

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of edmond0033 at comcast.net
Sent: Wednesday, October 24, 2012 3:44 PM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] Fwd: Effective half life question

The radionuclide that I have run into is Iodine-131.  It's biological half-life is less than its physical half-life

Ed Baratta

edmond0033 at comcast.net

-----Original Message-----
From: radbloom at comcast.net
Sent: Wednesday, October 24, 2012 5:27 PM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] Fwd: Effective half life question

Jeffrey,

If you are talking about prepared pharmaceuticals, these would have package inserts that would include information on the effective half-life for the particular radiopharmaceutical .

Cindy

----- Original Message -----

From: "Chris Alston" <achris1999@ gmail .com>
To: "The International Radiation Protection (Health Physics) Mailing List" < radsafe @health.phys. iit . edu >
Sent: Wednesday, October 24, 2012 4:16:54 PM
Subject: [ RadSafe ] Fwd:  Effective half life question

Jeffrey

There are a multitude of these, depending on exactly what you mean.
The MIRD Committee publishes reports, and there are ICRP Publications 53, 80, and 106.  There is also the RADAR website, doseinfo-radar.com.

But you might want to start with NUREG /CR-6345, Radiation Dose Estimates for Radiopharmaceuticals , of April 1996.

Happy hunting
cja

---------- Forwarded message ----------
From: Kulp , Jeffrey  ( DOH ) <Jeffrey. Kulp @ doh . wa .gov>
Date: Wed, Oct 24, 2012 at 2:59 PM
Subject: [ RadSafe ] Effective half life question
To: radsafe @health.phys. iit . edu

Hello Radsafers ,

I have a question that is related to radiopharmaceuticals . I have been
told by a colleague that the effective half-life of a radioactive
isotope can differ based on the chemical preparation the isotope is in.
Essentially the biological half life will change due to the varying
clearance rates for different chemicals, thereby changing the effective
half-life. Is there a database that addresses the different biological
half-lives for various radiopharmaceuticals ?

Thanks,

Jeffrey Kulp , RRPT

Radiation Health Physicist

DOH - Office of Radiation Protection

P.O. Box 47827

Olympia, Washington  98504-7827

(360) 236-3237

"Public Health - Always Working for a Safer and Healthier Washington"

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