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RE: FW: Tissue Equivalent Proportional Counters
>>> "Doty, Patrick" <fpdoty@SANDIA.GOV> 04/30/2003 12:41:31 >>>
>An organic scintillation detector with pulse-shape discrimination can
>determine n and gamma rates independently. Is there a commercial
system
>based on this approach?
I recall seeing one, however I forget who makes it...
It is essentially a LET meter.
It has an internal Cm-244 source that it uses for calibration -- if I
remember correctly it was several mCi.
Cary
-----Original Message-----
From: William V Lipton [mailto:liptonw@DTEENERGY.COM]
Sent: Wednesday, April 30, 2003 8:54 AM
To: MCCONNELL, MICHAEL E
Cc: 'radsafe@list.vanderbilt.edu'
Subject: Re: FW: Tissue Equivalent Proportional Counters
Tissue equivalent proportional counters are sensitive to any ionizing
radiation that can reach the active region of the detector. Thus, you
will
have trouble performing neutron surveys in a mixed gamma - neutron
radiation
field.
I remember, from my accelerator hp days, that the Zero Gradient
Synchrotron,
at Argonne National Laboratory used them. This facility had a stable
gamma/neutron ratio and the hp's had performed detailed studies to
determine
the effective quality factor. Thus, they could determine the
mrems/hour for
both neutrons and gamma with one survey instrument. If you can't
establish
an
effective Q, however, tissue equivalent counters are probably not
useful.
The opinions expressed are strictly mine.
It's not about dose, it's about trust.
Curies forever.
Bill Lipton
liptonw@dteeenergy.com
"MCCONNELL, MICHAEL E" wrote:
> > -----Original Message-----
> > From: MCCONNELL, MICHAEL E
> > Sent: Monday, April 28, 2003 3:36 PM
> > To: 'radsafe@list.vanderbilt.edu'
> > Subject: FW: Tissue Equivalent Proportional Counters
> >
> >
> >
> > -----Original Message-----
> > From: MCCONNELL, MICHAEL E
> > Sent: Monday, April 28, 2003 3:31 PM
> > To: 'radsafe@list.vanderbilt.edu'
> > Subject: Tissue Equivalent Proportional Counters
> >
> >
> > Question: What are the pros and cons of using a "Tissue Equivalent
> > Proportional Counter" (i.e. the REM-500 by FarWest Technologies)
for
> > measuring neutron expsoure rate, versus the Boron Tri-flouride
(BF3)
> > detector used with the PNR-4? I'm trying to clarify the difference
for a
> > class I'm presenting on the PNR-4. All responses will be
appreciated.
> > Thank you.
> >
> >
>
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