3 Geant4 B1 example is an application
for medical physics. The energy deposit is
4 implemented in user action
class (there are other methods to
do this.)
9 The QBBC physics list is used. It is a pre-set list.
13 ## Beam (Primary Generator)
15 one 6-MeV gamma, randomly distributed in front of the envelope across 80%
16 of the transverse (X,Y) envelope size.
21 We have 4 objects, which live in an air
"world" object. The envelope
object is
22 made of water, inside which we have
"bone" and
"tissue" objects. The materials
23 are taken from NIST database.
27 The scoring is implemented directly in the user action classes. Alternative
28 ways of scoring via Geant4 classes can be found in the other examples.
32 "run is the biggest simulation unit. In a run, there are many events, and in
33 "an event, we move the gamma forward step-by-step. The energy deposit from a
34 "step is accumulated throughout an event when the gamma is inside the scoring
35 "volume, which is the bone
object. The accumulated deposit energy in an
event
36 "then is summed up over the whole run.