[ RadSafe ] Effective half life question

[Ted de Castro]

It merely the equation that shows up so often in physics - like the 
"reduced mass" of a planet/moon system, two resistors in parallel - or 
two 1/2 lives:

1/hl1 + 1/hl2 = 1/hleff

Straight forward.

On 10/25/2012 1:07 PM, Jerry Cohen wrote:
> What is the "effect" that effective half-life relates to?
>
>
>
> ________________________________
> From: Cary Renquist <cary.renquist at ezag.com>
> To: The International Radiation Protection (Health Physics) MailingList
> <radsafe at health.phys.iit.edu>
> Sent: Wed, October 24, 2012 2:25:04 PM
> Subject: Re: [ RadSafe ] Effective half life question
>
> The RADAR site has an excel sheet with biokinetic info on many
> radiopharmaceuticals
> http://www.doseinfo-radar.com/RADARHome.html
> This is the direct link to the excel sheet:
> http://www.doseinfo-radar.com/NMdoses.xls
>
>
> ---
> Cary Renquist
> cary.renquist at ezag.com
>
>
> -----Original Message-----
> From: radsafe-bounces at health.phys.iit.edu
> [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Kulp, Jeffrey
> (DOH)
> Sent: Wednesday, 24 October 2012 12:00 PM
> To: radsafe at health.phys.iit.edu
> Subject: [ RadSafe ] Effective half life question
>
> 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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