[ RadSafe ] The theory of a Snoopy

[neildm at id.doe.gov]

The Snoopy's official name is the AN/PDR-70.  

The active component is a proportional tube filled with boron
trifluoride

The neutrons activate boron to an unstable isotope of lithium.  It
decays, with release of an alpha.  The alpha triggers an electron
cascade which is sensed by the proportional counter. 

The outer shield mimics the thermalization of a human torso so it reads
out in REM. (Polyethylene for soft tissue and borated poly for bone)

Not affected by gamma until the field is high enough to create
coincidence cascades (500 R/hr gamma or so)

Dave Neil
DOE-ID
Ex-105 tech

-----Original Message-----
From: radsafe-bounces at radlab.nl [mailto:radsafe-bounces at radlab.nl] On
Behalf Of ROMANOWICH Larry(L) - BRUCE POWER
Sent: Monday, January 22, 2007 8:38 AM
To: radsafe at radlab.nl
Subject: [ RadSafe ] The theory of a Snoopy

Hi:
	Does anyone have a good working description of how the "Snoopy"
responds to neutrons?  Thanks.

Larry Romanowich
Bruce Power
(519) 361-2673 ext 1565
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