From key@physics.utoronto.ca Fri Mar  7 15:06:05 2008
Date: Fri, 07 Mar 2008 15:06:05 -0500
From: Tony Key <key@physics.utoronto.ca>
To: jere.chan@utoronto.ca
Subject: Re: Error in example 2.5

Thanks, Jere, well  done!  In fact I don't like intensity either, as it
depends on how it is defined.  Energy fluence rate is the only correct and
unambiguous nomenclature I think.  Be ready to identify yourself on Monday
to receive your five bucks!

TonyK

jere.chan@utoronto.ca wrote:
> On Worked Example 2.5(i) Photon Fluence
> A monoenergetic beam of 25 MeV X-rays used in therapy delivers to a
> patient a power of
> 120 mJ.m-2. s-1. If the beam has a cross-sectional area of 5 cm2, what  is
> the photon
> fluence rate?
> 
> The word " power " is wrong, it should be" intensity " because in  Physics
> Power = Energy per second but Intensity = Energy per Area per  second. The
> concept is wrong.
> 

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