[Gate-users] Iodine 131 source

[Joulaeizadeh, (L) , Mrs]

Dear Gate users,
I'm simulating Iodine 131 beta emitter in a water phantom. I131 emits betas with different average energies. My source definition is as following:

/gate/source/addSource iodine131 gps
/gate/source/iodine131/setActivity 0.00001 Ci
/gate/source/iodine131/gps/particle e-
#/gate/source/iodine131/gps/ene/type Arb
#/gate/source/iodine131/gps/hist/type arb
/gate/source/iodine131/gps/hist/point  0.0694  0.02100
/gate/source/iodine131/gps/hist/point  0.0869  0.00650
/gate/source/iodine131/gps/hist/point  0.0966  0.07270
/gate/source/iodine131/gps/hist/point  0.1916  0.89900
/gate/source/iodine131/gps/hist/point  0.2002  0.00050
/gate/source/iodine131/gps/hist/point  0.2832  0.00048
/gate/source/iodine131/setForcedUnstableFlag true
/gate/source/iodine131/setForcedHalfLife     692902 s
/gate/source/iodine131/gps/type              Volume
/gate/source/iodine131/gps/shape             Sphere
/gate/source/iodine131/gps/radius            0.1 mm
/gate/source/iodine131/gps/centre            0. 0. 24.45 cm
/gate/source/iodine131/gps/angtype           iso
/gate/source/iodine131/gps/mintheta          0. deg
/gate/source/iodine131/gps/maxtheta          180. deg
/gate/source/iodine131/gps/minphi            0. deg
/gate/source/iodine131/gps/maxphi            360. deg
/gate/source/iodine131/attachTo mainBoxEntrance

In the histopoints, the first and second values are Eaverage and probability density of different betas.
I have few questions:

1-Do I need to use energytype Arb and histoname Arb? When I use them I get an error message: Error: IntType Unknown Type.

2-Should I use all the histopoints of one type of beta from 0-Emax? Or histopoints includes only average energy per beta type?

3- When I run the simulation, the phasespace energy goes up to 1 MeV whereas the maximum energy point I'm using is 0.2832! Do you maybe know the reason?

4- Do you maybe know a database for beta energy distribution of I131 (except RADAR)? The datapoints in RADAR seem to me strange!

Thanks,
Leila

<http://www.hollandmetrology.nl>



<http://www.vsl.nl/>[cid:vsl_logo_rgba305e.jpg]<http://www.vsl.nl>

 VSL

 Mrs (L) Joulaeizadeh PhD

 Research Scientist - Ionizing Radiation Standards

 D +31 15 2691681

 T +31 15 2691500



 www.vsl.nl<http://www.vsl.nl/>



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