From key@physics.utoronto.ca Sun Apr  6 19:40:41 2008
Date: Sun, 06 Apr 2008 19:40:40 -0400
From: Tony Key <key@physics.utoronto.ca>
To: nicholas.holzapfel@utoronto.ca
Subject: Re: Phy138 Problem

Hi Nicholas - Hmmm - I think you are correct.  Well done!  Indeed I should
have given the mass of the lungs, not the mass of the body.  (Since I
didn't, I guess everyone else got the "correct" answer using the whole body
mass.)

Thanks for pointing it out!

TK

nicholas.holzapfel@utoronto.ca wrote:
> Hello again Prof. Key. I have a question concerning Problem set #6
> "Radiation Dose from an Alpha Particle" - Part A. I was able to get the
> answer to the problem but i am unsure as to why. In calculating the
> Effective Dose, I first calculated the "normal" dose. I did this by
> finding the amount of energy emitted by the alpha particle over the year
> and dividing by the mass of the entire body. My question is: how come we
> found the dose using the mass of the entire body when all the energy is
> deposited in the lungs?
>