Re: roentgen to rad factor

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

>X-Sender: viru@therad
>Date:         Fri, 14 Nov 1997 14:55:53 -0600
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>From: Ramasamy Virudachalam <viru@THERAD.RPSLMC.EDU>
>Subject:      Re: roentgen to rad factor
>To: Multiple recipients of list MEDPHYS <MEDPHYS@LISTS.WAYNE.EDU>
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>>As an aside (and given that I currently practice diagnostic physics), I
>notice in Khans' _The Physics of Radiation Therapy_ that this factor is
>.876 rad/R while Johns and Cunninghams gives .873 rad/R.  Which witch is
>which?
>>
>Bill,
>The correct factor is 0.876 rad/R.
>The  difference you observed between the values reported in Kahns and Johns
>books stems from a change in W/e from 33.85 eV/ion pair to 33.97 eV/ion
>pair. For details refer to Attix's book on Introduction to Radiological
>physics and Radiation Dosimetry, p72.
>
>
>R.G. Virudachalam, Ph.D.
>Rush Pres. St. Luke's Med. Ctr., Chicago
>312-942-5751
>