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

[John R Johnson]

Doug an Mike

I agree that medical exposures are not background. Isn't that why UNSCEAR 
(http://www.unscear.org/unscear/en/publications/1988.html) has two annexes?

John
***************
John R Johnson, PhD
CEO, IDIAS, Inc.
Vancouver, B. C.
Canada
(604) 222-9840
idias at interchange.ubc.ca


----- Original Message ----- 
From: "Doug Aitken" <jdaitken at sugar-land.oilfield.slb.com>
To: "Brennan, Mike (DOH)" <Mike.Brennan at DOH.WA.GOV>; <radsafe at radlab.nl>
Sent: Tuesday, July 31, 2007 1:58 PM
Subject: RE: [ RadSafe ] Annual dose from Nature/Background/Man-made sources


> At 03:37 PM 7/31/2007, Brennan, Mike  (DOH) wrote:
>>While I was never a fan of the old pie chart, I am less a fan of the new
>>one and the message sent by changing it.
>>
>>I don't believe that medical exposure should be included in chart
>>background or average exposure.  No own receives an "average" medical
>>exposure: they either receive a medical exposure or they do not.  If you
>>have 100 people and 10 of them receive medical exposures of 1,000 mR
>>each, their exposure in no way affects the other 90 people.  If those
>>ten get 10,000 mR each, it STILL doesn't effect the other.  Changing the
>>number of people in the population changes the average, but doesn't
>>change the effect on the people receiving exposure, or those not.
>
> I have to agree with this!
>
> There is a great difference between (1) what you can avoid (occupational 
> doses for radiation workers, medical doses for everyone - which should all 
> be judged/justified on a risk-benefit basis) and (2) those you cannot 
> avoid (natural, fallout, etc).
>
> Of course, you "can" minimize the second category by moving your place of 
> residence..... (if you see any benefit in this <G>)
>
> Regards
> Doug
>
>
>
> Doug Aitken                     Cell Phone    713 562-8585
> QHSE Advisor
> D&M Operations Support
> Schlumberger Technology Corporation
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