Re[2]: Wart Removal

[Dave Derenzo <dave@uic.edu>]

Grenz Ray units have a pretty small field (in physical size) if I am 
remembering correctly.  Since the 440RF/D has a rather large chamber it 
would not be suitable for such measurements (the entire chamber needs to be 
in a uniform field or you have to make appropriate corrections for a 
nonuniform field).  The medical physicist that calibrated our old Grenz Ray 
unit used a very small condenser r-meter ion chamber with a thin window 
that had been especially designed by Victoreen for this purpose.  I suggest 
that if you want to do accurate dosimetry you should consult with a medical 
physicist who is familiar with this type of calibration.

Dave

At 09:11 AM 02/11/2000 -0600, you wrote:
>      I've had pretty good luck with the Victoreen 440RF/D.  According to
>      the manufacturer, it is able to resolve 0.02 mR/h from 15 kilovolt
>      X-rays. It's also immune to rf noise. I like the condenser R-meter
>      too, but it's not nearly as convenient.
>
>      Check out <http://www.victoreen.com/IRM/products.htm>
>
>      bill
>      william.ctr.kolb@faa.gov
>
>
>______________________________ Reply Separator 
>_________________________________
>Subject: Re: Wart Removal
>Author:  <radsafe@romulus.ehs.uiuc.edu> at SMTPgate
>Date:    02/11/2000 8:19 AM
>
>
>
>   Dear Lew et al.
>          A query about dosimetry for the X-rays you used in the past to
>treat the above skin condition. The reason for my query is my attempt to
>dose unfiltered X-rays. You say you used a Victoreen condenser R-meter to
>dose almost unfiltered 35 kVp X-rays. I'm not familar with the meter but
>would it have allowed you to dose the very low photon energies that you
>were probably interested in to treat the skin condition? Does anyone know
>of a perhaps more modern instrument that can be used for dosing the
>so-called  'Grenz' rays?
>
>   Regards,
>
>     David Hornsey
>
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Dave Derenzo (dave@uic.edu)
UIC Radiation Safety Section, M/C 932
Phones: Voice (312) 996-1177  Fax: (312) 996-8776

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