Hello everyone,
Using the MIRD human phantom I am trying to simulate iodine 131 decay in the stomach so I tried the GPS but the results that I got led me to believe that my approach is wrong;
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/gps/pos/type Volume #my iodine is contained in a capsule
/gps/pos/shape Cylinder #shape of capsule
/gps/pos/centre 8 -4 0 cm #center of emission is to be center of the stomach in the phantom
/gps/pos/radius 3.36 mm #radius of the capsule
/gps/pos/halfz 9.7 mm #half length of the capsule
/gps/ang/type iso #I don’t really know the angular distribution that I should use
/gps/ene/type Mono #I don’t know which energy type is compatible also
/gps/particle ion
/gps/ion 53 131 53 0.
/gps/energy 957. keV
/gps/number 1602 #Number of particles in 30mCi of 131I
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I have some questions about my work:
1/Am I in the right to consider the coordinates 8 -4 0 cm as the center of the stomach in the human phantom? If yes why there’s no energy deposition in the stomach but only in left leg or trunk?
2/Was I right to consider the capsule as a cylinder that contains iodine or should I consider a point beam instead?
3/Is there any documentation to angular distribution and energy type that would help me choose which suits me best?
4/The Excitation energy of iodine should I set to 0 or is that part of the problem?
5/Is there a way to enter the activity as input in mCi or Bq rather than calculating Number of particles?
And in the end thank you all for taking the time to read and respond to my topic.