[ RadSafe ] Effective half life question

[Duke]

So Jerry  if I had one apple and I ate half what would that be with the moons pull on the tides?

Duke
717.926.5870
Mark S. Sasser
Alara /Safety eng.

On Oct 25, 2012, at 4:46 PM, Ted de Castro <tdc at xrayted.com> wrote:

> 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"
>> 
>> 
>> 
>> 
>> 
>> _______________________________________________
>> You are currently subscribed to the RadSafe mailing list
>> 
>> Before posting a message to RadSafe be sure to have read and understood
>> the RadSafe rules. These can be found at:
>> http://health.phys.iit.edu/radsaferules.html
>> 
>> For information on how to subscribe or unsubscribe and other settings
>> visit: http://health.phys.iit.edu
>> _______________________________________________
>> You are currently subscribed to the RadSafe mailing list
>> 
>> Before posting a message to RadSafe be sure to have read and understood the
>> RadSafe rules. These can be found at:
>> http://health.phys.iit.edu/radsaferules.html
>> 
>> For information on how to subscribe or unsubscribe and other settings visit:
>> http://health.phys.iit.edu
>> _______________________________________________
>> You are currently subscribed to the RadSafe mailing list
>> 
>> Before posting a message to RadSafe be sure to have read and understood the RadSafe rules. These can be found at: http://health.phys.iit.edu/radsaferules.html
>> 
>> For information on how to subscribe or unsubscribe and other settings visit: http://health.phys.iit.edu
> 
> _______________________________________________
> You are currently subscribed to the RadSafe mailing list
> 
> Before posting a message to RadSafe be sure to have read and understood the RadSafe rules. These can be found at: http://health.phys.iit.edu/radsaferules.html
> 
> For information on how to subscribe or unsubscribe and other settings visit: http://health.phys.iit.edu