[Gate-users] BACKGROUND RADIATION

[Lorena VÁZQUEZ CANELAS]

Hi Gaters,

Do you know if there are some way to implement background radiation in a
PET simulation?
If so, how do you do? My problem is that if I define a box (as a
background) more bigger than PET's diameter, it gives me error.
The code that i did is the following:

#     WORLD:
/gate/world/geometry/setXLength       400. cm
/gate/world/geometry/setYLength       400. cm
/gate/world/geometry/setZLength       400. cm

#   BACKGROUND
/gate/world/daughters/name                    background
/gate/world/daughters/insert                  box
/gate/background/placement/setTranslation     0.0 0.0 0.0 cm
/gate/background/placement/setTranslation     0 0 0 cm
/gate/background/geometry/setXLength          70 cm
/gate/background/geometry/setYLength          70 cm
/gate/background/geometry/setZLength          70 cm
/gate/background/setMaterial                  Air
/gate/background/vis/setVisible               1
/gate/background/vis/setColor                 red

#    CYLINDRICAL
/gate/background/daughters/name               cylindricalPET
/gate/background/daughters/insert             cylinder
/gate/cylindricalPET/placement/setTranslation 0.0 0.0 0.0 cm
/gate/cylindricalPET/geometry/setRmax         45.3 cm
/gate/cylindricalPET/geometry/setRmin         42.1 cm
/gate/cylindricalPET/geometry/setHeight       21.4 cm
/gate/cylindricalPET/setMaterial              Air
/gate/cylindricalPET/vis/forceWireframe       1
/gate/cylindricalPET/vis/setColor             white

#    HEAD (rsector)
/gate/cylindricalPET/daughters/name           head
/gate/cylindricalPET/daughters/insert         box
/gate/head/placement/setTranslation           42.1 0 0 cm
/gate/head/geometry/setXLength                2 cm
/gate/head/geometry/setYLength                5.2 cm
/gate/head/geometry/setZLength                20.8 cm
/gate/head/setMaterial                        Air
/gate/head/vis/setVisible                     1
/gate/head/vis/setColor                       red

#    BLOCK (module)
/gate/head/daughters/name                     block
/gate/head/daughters/insert                   box
/gate/block/placement/setTranslation          0 0 0 cm
/gate/block/geometry/setXLength               2 cm
/gate/block/geometry/setYLength               5.2 cm
/gate/block/geometry/setZLength               5.2 cm
/gate/block/setMaterial                       Air
/gate/block/vis/setVisible                    1
/gate/block/vis/setColor                       blue

#    CRYSTAL
/gate/block/daughters/name                    crystal
/gate/block/daughters/insert                  box
/gate/crystal/placement/setTranslation        0.0 0.0 0.0 cm
/gate/crystal/geometry/setXLength             2 cm
/gate/crystal/geometry/setYLength             0.4 cm
/gate/crystal/geometry/setZLength             0.4 cm
/gate/crystal/setMaterial                     Air
/gate/crystal/vis/setVisible                  0

#    LSO layer
/gate/crystal/daughters/name                  LSO
/gate/crystal/daughters/insert                box
/gate/LSO/placement/setTranslation            0.0 0.0 0.0 cm
/gate/LSO/geometry/setXLength                 2 cm
/gate/LSO/geometry/setYLength                 0.4 cm
/gate/LSO/geometry/setZLength                 0.4 cm
/gate/LSO/setMaterial                         LSO
/gate/LSO/vis/setVisible                      1
/gate/LSO/vis/setColor                        yellow

#    REPEAT CRYSTAL
/gate/crystal/repeaters/insert                cubicArray
/gate/crystal/cubicArray/setRepeatNumberX     1
/gate/crystal/cubicArray/setRepeatNumberY     13
/gate/crystal/cubicArray/setRepeatNumberZ     13
/gate/crystal/cubicArray/setRepeatVector      0 0.4 0.4 cm

#    REPEAT BLOCK
/gate/block/repeaters/insert                  cubicArray
/gate/block/cubicArray/setRepeatNumberX       1
/gate/block/cubicArray/setRepeatNumberY       1
/gate/block/cubicArray/setRepeatNumberZ       4
/gate/block/cubicArray/setRepeatVector        0 0 5.2 cm

#    REPEAT HEAD
/gate/head/repeaters/insert                   ring
/gate/head/ring/setRepeatNumber               48

#    ATTACH SYSTEM
/gate/systems/cylindricalPET/rsector/attach   head
/gate/systems/cylindricalPET/module/attach    block
/gate/systems/cylindricalPET/crystal/attach   crystal
/gate/systems/cylindricalPET/layer0/attach    LSO

#    ATTACH CRYSTAL SD
/gate/LSO/attachCrystalSD

/gate/systems/cylindricalPET/describe

Thanks in advance

-- 

LORENA VÁZQUEZ CANELAS
PhD student, Research staff
LRI - Datación (Despacho Técnicos)
Calle Espejo, s/n, 37008 - Salamanca (Spain)
TEL: +34 923 294930 ext:4932 email: lorena.vazquez at usal.es
web: http://campus.usal.es/~lri/
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