Re: Question about neutron counting

From: Francesco Cerutti <>
Date: Mon, 14 Nov 2011 18:39:18 +0100


I would say that the relevant quantity, physically meaningful, is - as
almost always (with the respective particle species) - 2) "fluence" with

BEAMPART refers to first generation (LTRACK=1) particles. Any discrete
event (say interaction, apart from delta/Moller/Bhabha and nuclear elastic
scattering - but note that for low energy neutrons elastic scattering is
not disentangled as an independent interaction type - ) increases the
generation number.

Best regards


Francesco Cerutti
CH-1211 Geneva 23
tel. ++41 22 7678962
fax ++41 22 7668854

On Sat, 12 Nov 2011, lzfneu wrote:

> Dear all,
> I want to calculate the theoretical transmission value (I/I0) of polyethylene for 2.45MeV neutron which range from 0.5cm to 3.0cm
> thickness and compared with the experimental one. The counting experiment is He3 proportional counting tube. I am confused that
> which one I should choose in the USRBDX card to do the simulation:
> 1) "fluence" with "beampart";2) "fluence" with "neutron";or 3) "current" with "beampart";4) "current" with "neutron";
> I am also confused that what the difference is between the "beampart" and "neutron" in the USRBDX card when neutron is scored, thank
> you !
> Thanks in advance and any help will be appreciated !
> RegardsZ.F.Lee
Received on Mon Nov 14 2011 - 21:05:33 CET

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