From: Burge, F \(Frances\) (frances.burge@diamond.ac.uk)
Date: Wed Jul 25 2007 - 18:11:02 CEST
Hello fluka users,
Having got the gammas working I'm now looking at photoneutrons
generated from a 3 GeV electron beam on a tungsten target. I have a
vacuum region between the target and a lead shield wall.
I've run for 1E6 electrons, and score photons as expected in and around
the target. However at the moment it appears that I'm scoring
photoneutrons in the target and the shield wall, but not seeing any
neutron fluence in the vacuum between them. When I plot the results this
is shown very clearly as the scored neutron fluences stop abruptly on
the edges of the target and wall.
I've used the following cards to activate photoneutron interactions at
all energies and bias them (and using PRECISIOn as the DEFAULT):
* Switch on gamma interactions with nuclei in all materials and bias
interaction length
PHOTONUC 1.0 VACUUM @LASTMAT
LAM-BIAS 0.02 PHOTON
* Neutron fluence around target - scored as H*(10) pSv/primary
USRBIN NEUTRON -28.0 190.0 0.0 3075.0AMB74
USRBIN 140.0 -125.0 2975.0 100.0 200.0 200.0&
Do I need additional cards to be able to score neutrons in the vacuum
region?
thanks,
Frances
Frances Burge
Health Physicist
01235 778269
Diamond Light Source Ltd.
Rutherford Appleton Laboratory
Chilton
Didcot
OX11 0DE
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