Re: Dental X-ray machines

[maj_louie_tonry@ddeamc.smtplink.amedd.army.mil]

     Typical Dental X-Ray Machines run at 70 kVp.  Older machines have 
     variable kVp but newer ones only use one kV.  Filtration is about 1.5 
     - 1.8 mm Al at 70 kV.  I believe this filtration comes from inherent 
     in the glass envelop plus added aluminum placed at the end of the 
     cone.
     
     Hope this helps.  Also note - if you are performing surveys of dental 
     systems caution must be applied when measuring both time and kV.  
     Particularly with the Kiethly Triad there are problems with preheat 
     cycles.  Let me know if you need further information.  I did a nice 
     study of the Triad.
     
     MAJ Tonry7
     
          
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     + LOUIE TONRY, CHP                                                   + 
     + MAJOR, MS                                                          + 
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______________________________ Reply Separator _________________________________
Subject: Dental X-ray machines 
Author:  <radsafe@romulus.ehs.uiuc.edu > at Internet-Mail
Date:    4/6/99 5:05 PM


Greetings all,
     
I would like to know the effective filtration of a standard dental X-ray 
machine.  Is there usually Berillium plus some other material (Cu or Al)?  Also,
if there is a "standard" filtration package that is generally used (x mm Cu, y 
mm Al, etc).
     
Also, I am under the impression that they generally run between 50 - 80 kVp.  Is
this the case?
     
Any pointers toward established web sites would be appreciated.
     
Thanks,
     
Rob
     
     
--------------------------------------------------------------------------------
--------------------------
     
Robert J. Gunter         Tel: (714) 545-0100
     
Sr. Technical Specialist      Tel: (800) 548-5100 Ext. 2414
     
ICN Biomedicals, Inc.         Fax: (714) 668-3149
     
Dosimetry Division       Email: rjgunter@icnpharm.com
     
3300 Hyland Avenue
     
Costa Mesa, CA  92626
     
     
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