RE: saftey of being in the proximity of someone on RAI therapy

[John Jacobus <crispy_bird@YAHOO.COM>]

Have you considered the effective half-life?  Also,

you need the activity upon release, not administered. 





--- "Flanigan, Floyd" <Floyd.Flanigan@nmcco.com>

wrote:



> I believe another concern which the original poster

> was the risk of spending a couple of hours a day

> with the patient in question. Here is a little rule

> of thumb for I-131:

> 

> If you had 1 curie (far far more than I would

> imagine your friend has been given)and you spent 1

> hour within 3 feet of that quantity, you would

> receive 0.282939 Rem of dose. So figure on roughly

> 0.3mr/hr dose rate @ 3 feet for every millicurie of

> I-131 your friend has been given. If she has 50

> millicuries, the worst case scenerio for first day

> would be 15mr/hr @ 3 feet. Now ... consider that for

> 3 hours you are looking at 45mr exposure. Of course,

> I have no idea what the millicurie content of her

> treatment has been, although I doubt it is anywhere

> near 50 millicuries. If you like, you can post the

> particulars if available and one of us could do a

> rough dose rate/time/exposure estimate for you. 

> 

> Floyd W.Flanigan B.S.Nuc.H.P.

> 

> -----Original Message-----

> From: Gerald Nicholls

> [mailto:Gerald.Nicholls@dep.state.nj.us]

> Sent: Friday, August 20, 2004 11:32 AM

> To: kb1ipd@HOTMAIL.COM;

> owner-radsafe@list.Vanderbilt.Edu;

> radsafe@list.Vanderbilt.Edu; Flanigan, Floyd;

> phil.egidi@state.co.us;

> crispy_bird@yahoo.com

> Subject: RE: saftey of being in the proximity of

> someone on RAI therapy

> 

> 

> John Jacobus crispy_bird@yahoo.com wrote:

> 

> "Maybe it is about time that the regulators consider

> the cost outweigh the risk, and consider allowing

> landfills to receive and dispose of short-lived

> radioactive waste from medical treatments."

> 

> I don't think there is a great deal of disagreement

> on that subject. 

> Most of the waste will wind up in the landfill

> anyway (possibly after

> being held for decay).  The problem is who

> determines that it is

> short-lived...the landfill operator or the hospital

> where the patient

> was treated?  My preference would be for the

> hospital where

> appropriately trained people deal with radioactivity

> on a day to day

> basis.  

> 

> Gerald Nicholls

> NJDEP 

>

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> 





=====

+++++++++++++++++++

"Everyone is ignorant, only on different subjects."

Will Rogers



-- John

John Jacobus, MS

Certified Health Physicist

e-mail:  crispy_bird@yahoo.com





		

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