[Gate-users] Specifying the source activity

[KB]

Hello All,

     Reading the Gate user manual, it is not clear what the activity
is: is it the concentration or the total activity?

    In other words, what exactly am I specifying when the macro file says

/gate/source/F18HOTSPOT/setActivity 0.0001 Ci
/gate/source/F18HOTSPOT/gps/type Volume
/gate/source/F18HOTSPOT/gps/shape Sphere
/gate/source/F18HOTSPOT/gps/radius 0.5 mm

   Is that a concentration of 0.0001 Ci/cc or   0.0001 Ci /
(4/3.PI.(0.5^3)) cc.

    Thanks.


KB