[Gate-users] Fig1

[王天泉]

Dear Gate-users,
  I'm confused when I simulated the Dosimetry generated by F-18.
  When I defined the source as a "e+" in a Cylinder geometry,
  the result seems it dose not have influence on the other region, as shown in appendix Fig1.png.

  When I defined the source as beam, a 0.511 MeV gamma ray, radiate the phantom, the result shows better.
  It had influence on a long region, as shown in appedix Fig2.png.
  
  So confused am I, thanks everyone!
  Your Sincerely,
  Quan
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