Subject: RE: FW: Tissue Equivalent Proportional Counters

["Rob Gunter" <rgunter@SEC-TN.COM>]

Greetings All,



My understanding of the benefit of a TEPC is that you don't have to

distinguish neutron dose from gamma.  That said, if a scatter reaction of a

neutron and hydrogen atom (proton) is equally probable at any scatter angle,

and thereby recoil energy, how do you distinguish low E scatter reactions

with TEPC?  Do you simply assume a distribution of scatter based on the

energy spectrum of high E recoils (assuming the equal probability of scatter

at all angles)?



If you can relate Q to dE/dx, the TEPC would give you effective dose

regardless of the source.



Rob Gunter



Robert J. Gunter, CHP

Operations Support Manager, ETTP

Oak Ridge, TN

rgunter@sec-tn.com

Ph:  (865) 241-9748

Fax: (865) 241-7526

Cell:(865) 556-4380

Pgr: (865) 873-0078

------------------------------



Date: Wed, 30 Apr 2003 12:40:08 -0600

From: "Doty, Patrick" <fpdoty@SANDIA.GOV>

Subject: RE: FW: Tissue Equivalent Proportional Counters



I mean count rates.  The pulse characteristics in organic scintillators can

depend strongly on dE/dx, so that recoil proton counts can be binned

separately from electron and gamma counts.  Thus in principle with modern

digital pulse processing, a single instrument could determine both exposure

(from the pulse heights) and effective Q (from the distribution of pulse

widths).  Seems to me this would be useful in health physics.



Patrick





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