Re: PICs

[Chris Alston <alstonc@odrge.odr.georgetown.edu>]

Folks

The Victoreen 450P, which has been mentioned several times in this thread,
is pressurized to six (6) atm, or, 6 atm x 14.7 psi/atm = 88 psi. The
chamber wall, and "build-up cap" (the primary housing), are polycarbonate
(I think) @ ~400 mg/cm2. It's useful down to ~20 keV (as for Pd-103 in
prostates), as long as you're willing to apply a multiplicative
E-correction factor of as much as two (2).

The Reuter-Stokes instruments are, in fact, much more highly pressurized,
as Rodney says, to 25 atm (25 x 14.7 = 368 psi). The chamber is stainless
steel, with a wall thickness of 2.37 g/cm2, see the HASL-300 Procedures
Manual (1990), Section 3.2.2.

Paging Paul Frame. 

chris a.

>We have a Reuter-Stokes model pressurized to 25 atmospheres.  I do not
know the
>composition of the chamber walls, however, the instrument's manual lists
>gamma-ray sensitivities down to 60 keV.
>
>Rodney Bauman
>rodney_bauman@wssrap-host.wssrap.com
>
>____________________Reply Separator____________________
>Subject:    RE: RE: Dose Rates vs. Altitude 
>Author: <radsafe@romulus.ehs.uiuc.edu>
>Date:       12/02/1999 11:43 AM
>
>I suspect you mean six atmospheres of pressure, not 600 psi.  At 600 psi,
>the walls of the chamber would have to be so thick as to render the
>instrument useless at low to moderate energies.  (Even at six atmospheres,
>the lower energy spec on one commercial instrument is 60 KeV.)
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