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Text File  |  1993-01-24  |  698 b   |  19 lines
  1. Newsgroups: sci.physics
  2. Path: sparky!uunet!zaphod.mps.ohio-state.edu!uwm.edu!linac!att!cbnewsc!tjr
  3. From: tjr@cbnewsc.cb.att.com (thomas.j.roberts)
  4. Subject: Re: photon 'detectors' - how reliable?
  5. Organization: AT&T
  6. Date: Mon, 25 Jan 1993 03:26:35 GMT
  7. Message-ID: <1993Jan25.032635.13161@cbnewsc.cb.att.com>
  8. References: <1993Jan24.031910.8612@galois.mit.edu>
  9. Lines: 8
  10.  
  11. [discussion of quantum efficiency (qe) deleted]
  12.  
  13. The qe of a detector is HIGHLY energy dependent.
  14. Once you get above the e+e- pair-production threshold (about
  15. 1 MeV - that's a gamma ray, MUCH more energetic than visible
  16. light), there are numerous detectors which approach 100% qe.
  17.  
  18. Tom Roberts    att!ihlpl!tjrob        TJROB@IHLPL.ATT.COM
  19.