RE: Beam Correction Factors

["Lieskovsky, Miro" <MLieskovsky@nbpower.com>]

RADSAFERS

Dick Olsher of LANL has used MCNP runs with the following response for the
9" REM ball; results are normalized to unit incidence fluence and use a
certain neutron spectrum.
1" dia beam/9" beam = 0.0187,
2" dia beam/9" beam = 0.0733,
4" dia beam/9" beam = 0.274
The factors assume that if the fluence fields are expanded to fully
irradiate the REM ball, ratios would be unity.

Hope this helps.  

Miroslav Lieskovský
Health Physicist
NB POWER - PLGS - HP Dep't
PO BOX 10, Lepreau, NB, Canada, E0G 2H0
tel. (506) 659 7421, fax. (506) 659 6507
mlieskovsky@nbpower.com





-----Original Message-----
From: Kathryn M. Brock [mailto:brockkm@engr.orst.edu]
Sent: August 26, 1999 3:27 PM
To: Multiple recipients of list
Subject: Beam Correction Factors


When monitoring with a portable neutron remmeter, is it appropriate when
measuring a small collimated beam to correct for the size of the detector
(sphere) volume in the same manner that the dose rate is corrected when
measuring a gamma beam with an ion chamber?  Is there a good reference
available?

Thanks,
Kathy

~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Kathryn M. Brock
Health Physicist
Radiation Center
Oregon State University
100 Radiation Center
Corvallis, OR  97331
Phone:  541-737-7047
Fax:    541-737-0480
brockkm@rc.orst.edu

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