today's best value for W in air

[Chris Alston <alstonc@odrge.odr.georgetown.edu>]

>It's Ignorant Question Time! All you therapy physicists know this:
>
>What's today's best-accepted value for W (the mean energy expended in air
>per ion pair formed)?
>
>It's changed several times during my career, and being a diagnostic type,
>I'm not as up-to-date as I should be.
>
>If you don't want to clog the MEDPHYS ether, you can email me directly.
>
>Thanks.
>
>Doug

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