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Re: Another question re: dose



Richard



I haven't tried it but the HPS has a FAQ window on their website

(www.hps.org) and the information you want may be available there.



FYI, doses can be in Grey (absorbed dose in energy per unit mass) or two

kinds of Seiverts (1. equivalent dose in Greys x a radiation weighting

factor Wsub(R) or 2. effective dose (Esub(eff)) in Greys x a radiation

weighting factor Wsub(R) x  a tissue weighting factor Wsub(T) ). The

effective dose is an attempt to calculate a quantity that is proportional to

the risk.



A whole body Esub(eff) of 10 mSv/year has a much higher risk than the same

Esub(eff) to a smaller tissue.



On the other question; all (or most) materials contain some radioactivity

(eg radon progeny in natural gas, etc) and what is contaminated and what is

not depends on who is asking the question and for what purpose.



John

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John R Johnson

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----- Original Message -----

From: "Richard L. Hess" <lists@richardhess.com>

To: <radsafe@list.vanderbilt.edu>

Sent: Friday, September 06, 2002 2:35 PM

Subject: Another question re: dose





> A while ago someone posted an anti-nuke URL to this list. I went and read

> it and started seeing through all of the hoopla.

>

> One item caught my attention. Someone was trying to differentiate between

a

> whole-body dose (let's say 10mSv/year) and that same dose applied to a

> single point (I think the example was within the lung).

>

> I realize that an alpha emitter may create a much greater risk (why else

is

> its QF 20?) but I think I'm lost about whole body doses and point doses.

>

> Now that I'm thinking about it, how do some things become contaminated

with

> radiation while others don't?

>

> Pointers to GOOD FAQs would be useful (it's hard to separate wheat from

> chaff in this subject on the Web).

>

> A little math doesn't scare me...but lots of math does <smile>.

>

> Thanks!

>

> Richard

>

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