Re: Cellular Phones and EPDs

[BRZGV@ccmail.ceco.com]

     I believe other manufactures encase their detector and preamp boards 
     in tin-like shells of many mg/cm^2.  The ability to detect beta 
     radiation could in itself prevent shielding out unwanted interference.
     
     Glen Vickers
     brzgv@ccmail.ceco.com


______________________________ Reply Separator _________________________________
Subject: Cellular Phones and EPDs
Author:  radsafe@romulus.ehs.uiuc.edu at INTERNET
Date:    10/24/96 3:33 PM


Radsafers:
     
I just discovered that my Siemens Electronic Personal Dosimeters (EPD-2s) 
are rather sensitive to the electronic and magnetic fields (H field would 
be my guess) emanating from cellular telephones.  One began alarming while 
I was making a call this afternoon (I was three or four feet away from the 
EPD).  I was able to confirm my suspicions by getting the second EPD to 
alarm by placing the phone (with a call in progress) closer to it.  The EPD 
was only "under the influence" of the phone's EM fields for about five 
seconds.  However, both shallow and deep dose values increased by many 
hundreds of millirem.
     
Do any of you have data regarding E and H fields associated with cell 
phones at varying distances (and typical frequency ranges)?  I would like 
to compare that information with the electromagnetic compatibility data 
attributed to the Siemens EPDs.
     
Your assistance is appreciated!
     
-Erick Lindstrom
     
     
 Erick Lindstrom
 Radiation Safety Officer
 309 Montana Hall
 Montana State University
 Bozeman, MT  59717-0244
 Phone: (406) 994-2108
 Fax: (406) 994-4792
 avrel@gemini.oscs.montana.edu