|Message: Re: photo electric peak wih G4||Not Logged In (login)|
Click on the Forum title, e.g. on the "Forums by Category" page, to read a sequence of postings to the Forum and its threads all in one page. If you are only interested in one thread or the thread following a specific posting, click the thread or the posting, which takes you to a smaller page, which contains only the part you are interested in and may be easier to navigate.
Messages are "chained" if there are only replies at the first level, i.e. 1/1.html, 1/1/1.html etc. In case of "chained" messages the message number is replaced by the icon and there is no indentation.
Inline: Display the subject line only or also the text of the posting(s); for the choice "All" the "Outline" choices are switched off.
|1||0||1||no text / full text of posting|
|2||1||All||text for level 1 only / text for All postings|
Outline: Choose the depth of the posting thread, successive toggle controls provide increasing detail.
|1||2||1||2 levels / 1 level (original posting)|
|2||3||2||3 levels / 2 levels|
|3||3||All||3 levels / all levels (all postings)|
1) The NIST data base gives PhotoElectric Absorption in BGO at 511 keV : 5.56 E-2 cm2/g (http://PHYSICS.NIST.GOV/PhysRefData/Xcom/Text/XCOM.html) for which one compute, in 2 cm BGO, an interaction rate of 54.61 %
2) I took examples/extended/electromagnetic/TestEm1 (see README for how to run it), added BGO definition in DetectorConstruction, and ran with the following macro:
# # Macro file for "TestEm1.cc" # (can be run in batch, without graphic) # # PhotoElectricEffect; Gamma 511 keV # /control/verbose 2 # /run/initialize # /testem/det/setMat BGO /testem/det/setSize 2 cm /testem/det/update # /testem/gun/setDefault 1 # /run/verbose 2 # /gun/particle gamma /gun/energy 511 keV # /process/list /process/inactivate compt /process/inactivate conv /process/inactivate eBrem # #/testem/gun/rndm 0.8 # /run/beamOn 100000
Below is the result :
Run Summary Number of events processed : 100000 User=0.32s Real=33s Sys=33s
nb tracks/event neutral: 1.0000 charged: 0.5411 nb steps/event neutral: 1.0000 charged: 0.5411
nb of process calls per event:
phote Ioni Transportation 0.5411 0.5407 0.4593
a rate of 54 %, as expected.
|Inline Depth:||Outline Depth:||Add message:|