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Forum: Biasing and Scoring
Re: Question nOfSecondary Weighting
Date: 03 May, 2010
From: Tsukasa Aso <Tsukasa Aso>

Hi,

 Particle weighting factor is normally equal to 1.
It is basically introduced for event biasing such as
"Importance Sampling". Please look at "Geant4 Application Guide,
Section 3.7 Event Biasing Techniques".

 If your application does not use such event biasing techniques,
the weights of tracks are always 1.

 Concerning to getting a energy spectra of neutrons, I would like
to confirm if you define scorers with respect to energy bins.
i.e. one scorer is only for energy bins. The index number of scorer
output corresponds to the geometry cell number.

If you want to get energy spectra (1MeV to 4MeV in 1 MeV bin), 
you may do:

#
# define scoring geometry
#  with 30 sliced-cells in z-axis
#
/score/create/boxMesh boxMesh_1
/score/mesh/boxSize 100. 100. 100. cm
/score/mesh/nBin 1 1 30
#
# define scorers and filters
#
/score/quantity/noOfSecondary  score1stbin
/score/filter/particleWithEnergy n_1stBin neutron  1.0 2.0
/score/quantity/noOfSecondary  score2ndbin
/score/filter/particleWithEnergy n_2ndBin neutron  2.0 3.0
/score/quantity/noOfSecondary  score3rdbin
/score/filter/particleWithEnergy n_3rdBin neutron  3.0 4.0
#
/score/close
#

Each scorer (score1stbin,score2ndbin, score3rdbin) get numbers
of generated neutrons within assigned energy interval of neutrons.
Please be sure that the index number of each scorer 
stands for the cell number, in this case 1 x 1 x 30 cells.

Best regards,
Tsukasa Aso

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1 Question: please tell me what i am doing wrong for neutron flux in medical linac example   (Amjid Mahmood - 23 Jun, 2015)
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