geant4-B1-example  1.0
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README.md
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1 # Introduction
2 
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.)
5 
6 
7 ## Physics List
8 
9 The QBBC physics list is used. It is a pre-set list.
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11 
12 
13 ## Beam (Primary Generator)
14 
15 one 6-MeV gamma, randomly distributed in front of the envelope across 80%
16 of the transverse (X,Y) envelope size.
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18 
19 ## Geometry
20 
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.
24 
25 ## Detector response
26 
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.
29 
30 ## User actions
31 
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.