[Gate-users] The root-output for the PhaseSpaceActor

[David Sarrut]

Hello,

On Mon, Nov 3, 2014 at 12:47 PM, Jenny Nilsson <jenny.nilsson at radfys.gu.se>
wrote:

>  Dear Gate-users,
>
>  I have two questions about the PhaseSpaceActor. I’ve searched the
> mailing-list with no luck.
>
>  Simulation set-up: A Co-60 point source in the centre of a water-filled
> sphere, radius 10 cm. Centre of sphere at (0,0,0). The Co-60 source is
> defined as an ion source and decays. The world is outside sphere and the
> PhaseSpaceActor is attached to the world. The table shows data extracted
> from the root file (the first 12 particle entries).
>
>  1. At row 0 and 6, there is a particle with kinetic energy 1 MeV at
> position (0,0,0). Co-60 does not emit 1 MeV particles and the lack of
> decimals for Ekine and source position (X, Y, Z) makes me believe that this
> is not a usual particle entry. It seems like every decay starts with this
> particle. Does anyone know more about the origin of row 0 and 6?
>

no idea, sorry.


>
>  2. From the manual about the PhaseSpaceActor : ”This actor records
> information about particles entering the volume which the actor is attached
> to…x. The name of the particle, the kinetic energy, the position along the
> three axes, the direction along the three axes…” The positions (X, Y, Z)
> are both inside and outside the volume to which the PhaseSpaceActor is
> attached. Is the position in the root file the particle position from which
> it originates, before entering the volume to which the PhaseSpaceActor is
> attached?
>

yes, by default, this is the location of the preStep, so for entering
particle, it can be outside. You can look the exact behavior in the
UserSteppingAction of the GatePhaseSpaceActor.cc file. This actor has a lot
of options (storeOutgoingParticle, EnableAllStep, UseVolumeFrame etc). I am
not sure why this is the preStep here and not the postStep. Maybe could it
be interesting to let the user choose with an option ...

David



>
>     Row          Ekine  Weight           X           Y           Z
> dX          dY          dZ   ParticleN   Productio   Productio           0
> 1 1 0 0 0  0.8275845   -0.542834   -0.142950   Co60[0.0]   scanner_l
>              1  0.1966645  1  0.0012719   -0.000834   -0.000219
>  -0.429716   0.4251133   -0.796632          e-   scanner_l   Radioacti   2
>  0.1214847  1  0.0012719   -0.000834   -0.000219   0.5730408   0.0333085
>  -0.818849   anti_nu_e   scanner_l   Radioacti   3  2.727e-06  1
>  0.0012719   -0.000834   -0.000219   0.2551139   -0.384539   0.8871561
>  Ni60[2505   scanner_l   Radioacti   4  1.1732176  1  0.0012723
>  -0.000834   -0.000218   -0.960432   -0.261985   -0.094516       gamma
>  scanner_l   Radioacti   5  1.3324921  1  0.0012723   -0.000834
>  -0.000218   -0.083264   -0.878164   0.4710559       gamma   scanner_l
>  Radioacti   6 1 1 0 0 0  0.8887608   0.0749674   0.4521991   Co60[0.0]
>  scanner_l   Radioacti   7  0.0789978  1  0.0013659   0.0001152
>  0.0006949   0.0645403   -0.209042   -0.975774          e-   scanner_l
>  Radioacti   8  0.2391535  1  0.0013659   0.0001152   0.0006949
>  0.6967408   0.5879607   0.4109191   anti_nu_e   scanner_l   Radioacti   9
>  6.863e-07  1  0.0013659   0.0001152   0.0006949   -0.670755   -0.285273
>  0.6846210   Ni60[2505   scanner_l   Radioacti   10  1.1732176  1
>  0.0013653   0.0001149   0.0006956   0.6809428   0.4493534   -0.578271
> gamma   scanner_l   Radioacti   11  0.0083415  1  50.464988   33.301002
>  -42.85412   -0.179916   -0.516923   -0.836910          e-   scanner_l
> Compton   12  1.3324921  1  0.0013653   0.0001149   0.0006956   0.7317848
>  0.6797550   -0.049233       gamma   scanner_l   Radioacti
>
>  Best regards,
> Jenny Nilsson
>
>  ======================================
>  Jenny Nilsson Ph. D.
> Institute of Clinical Sciences
> Department of Radiation Physics
> University of Gothenburg Sweden
>
>
>
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>



-- 
David Sarrut, Phd
Directeur de recherche CNRS
CREATIS, UMR CNRS 5220, Inserm U 1044
Centre de lutte contre le cancer Léon Bérard
28 rue Laënnec, 69373 Lyon cedex 08
Tel : 04 78 78 51 51 / 06 74 72 05 42
http://www.creatis.insa-lyon.fr/~dsarrut
_________________________________
 "2 + 2 = 5,  for extremely large values of 2"
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