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Forum: Biasing and Scoring
Re: Question How score Kinetic Energy? (lu luo)
Date: 05 May, 2010
From: Tsukasa Aso <Tsukasa Aso>

Hi,

 As you described, current command-based scoring does not provide a scorer for
directly accumulating particle's kinetic energy. 

 The command-based scoring ( using Primitive scorers ) are designed 
to accumulate physics quantity, so that you can not know/extract individual 
track information from the result. 
(Of course, you can do everything with SensitiveDetector/Hits by developing
those by yourself. )

 I understood that you want to know the 'accumulated' kinetic energy
of gamma which enter the cell. Under the assumption that there is no
effect from Compton scattering and e+e- pair production, it may be obtained
( or approximately estimated ) by using trackLength scorer.

/score/quantity/trackLength   trkL  true  false false
gives an accumulated "pure" track length.

/score/quantity/trackLength   trkLwKinE  true  true false
gives an accumulated track length with multiplying its kinetic energy,
i.e.  trkL * Kinetic-Energy.

Therefore, you can calculate the accumulated kinetic energy by
dividing trkLwKinE by trkL. 

Of course you have to apply "gamma" particle filter as a SD-filter to 
avoid contributions from secondary electrons.The secondary gammas are
also encountered.
 
 Be sure that this is correct under above assumptions.


Alternatively, you may obtain kinetic energy spectra using 
/score/quantity/nOfTrack
with 
/score/filter/particleWithKineticEnergy.
Please look at 
http://hypernews.slac.stanford.edu/HyperNews/geant4/get/biasing_scorin/18/1.html
as an example.

Best regards,
Tsukasa Aso

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1 Sad: Re: How score Kinetic Energy?   (lu luo - 06 May, 2010)
(_ Ok: Re: How score Kinetic Energy?   (lu luo - 07 May, 2010)
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