[ RadSafe ] Annual dose from Nature/Background/Man-made sources

[Johnston, Thomas]

Jim
Thank you very much. I was just scanning the NCRP site for this
information. Will we have to update our pie charts?

Tom

-----Original Message-----
From: Muckerheide, Jim (CDA) [mailto:Jim.Muckerheide at state.ma.us] 
Sent: Tuesday, July 31, 2007 2:38 PM
To: Johnston, Thomas; radsafe at radlab.nl; Academic-Medical Radiation
Safety Officers listserve
Subject: RE: [ RadSafe ] Annual dose from Nature/Background/Man-made
sources

The new NCRP estimate for average medical exposure is 320 mr/yr, up from
54 mr/yr in 1987.  The 360 is from 300 nat bkgd (in the U.S., 240 in the
world) plus 60 medical (54) and other (6?)

Assuming nat bkgd at 300, and med is 320, will the new total bkgd be
625?, 630?  Up from "360" - and now we have to explain that to our
students and trainees, and the public.

(With 0.32 rem avg med doses, times U.S. 300 million people, is 100
million person-rem, each year?  Using 50 years for 'effective lifetime'
doses, 5 billion rem?  So LNT-nuts claim diagnostic medicine is killing
how many people in a generation? :-)  

Good grief :-(

Regards, Jim Muckerheide
 

>-----Original Message-----
>From: radsafe-bounces at radlab.nl 
>[mailto:radsafe-bounces at radlab.nl] On Behalf Of Johnston, Thomas
>Sent: Tuesday, July 31, 2007 1:09 PM
>To: radsafe at radlab.nl; Academic-Medical Radiation Safety 
>Officers listserve
>Subject: [ RadSafe ] Annual dose from 
>Nature/Background/Man-made sources
>
>I recently read a paper regarding the average doses from medical
>diagnostic procedures has increased, rather than decreased. This is
>primarily due to multi-slice CT imaging techniques. (Sorry, 
>but I cannot
>recall the journal!)
>
> 
>
>Question, will there be a change to the average annual dose of 360/year
>from Nature/Background/Man-made sources that we have been 
>using for some
>time? (Unless, of course, you happen to live in Denver, etc.) If so,
>when will the change take effect? I know I should also pose this
>question to the "Ask the Experts" on www.hps.com 
><http://www.hps.com/> .
>
> 
>
>Does anyone have any insight on this matter? Yours thoughts 
>and comments
>are welcome.
>
> 
>
>Thomas P. Johnston
>
>Radiation Safety Officer
>
>New York Medical College
>
>Valhalla, NY 10595
>
>914-594-4448 office
>
>914-594-3665 fax
>
>914-557-5950 mobile
>
>tom_johnston at nymc.edu
>
> 
>
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