CodyMilne G4Proj

Photon Energy deposition in a pure Ge crystal

Here is the mass attenuation cross sections for Germanium ---

Here is the total photon attenuation for Germanium ---

Here is the range of electrons in Ge as a function of energy ---

Determine the deposition of photons ranging in energy from 10 eV to 3 MeV in a pure Germanium crystal assuming an infinite block.

Attenuation coefficient about 1/5.323 cm = 0.19 cm or about 2 mm to maybe 2 cm?

Create file containing Photon Energy, ProcessID, step #, Energy Lost, Position for each step a photon takes through the Germanium crystal.

Date	Time
1/26/16	1 hour
1/27/16	1 hour
1/29/16	1 hour
2/4/16	1 hour
2/5/16	3 hour
2/8/16	2 hour
2/9/16	2 hour
2/10/16	1 hour
2/11/16	2 hour
2/14/16	2 hour
2/16/16	2.5 hour

Results of energy loss in Germanium

Why do SN>1 photons loose energy at Z = -9000?

10 eV

1-D plot of events for each step as function of Z

1-D plot of the energy deposited for each step as function of Z

200 px

100 eV

Start with[math] E_{gamma}[/math] = 100 eV

200 px

1 keV

Start with[math] E_{gamma}[/math] = 1 keV

200 px 200 px

10 keV

Start with[math] E_{gamma}[/math] = 10 keV

200 px

Energy Deposition

Send photons from inside an infinite crystal at 100, 500, 1000,3000 keV energy. Add up all the energy loss and see if you get delta functions or a delta + tail because GEANT4 stopped taking the photon and thus the energy is not accounted for.

100 keV

Start with[math] E_{gamma}[/math] = 100 keV

500 keV

Start with[math] E_{gamma}[/math] = 500 keV

Change units on Y-axis to Energy (eV?)

"No Backscattering" Do another plot with momentum cut Pz>0

Add 9000 to Z-position to start Ge barrier at zero

Initial verification - The first gamma interaction distribution is consistent with the published Ge mass attenuation coefficient at 500keV (0.08212) and a Ge density of 5.323.

Are the 2-D plots energy weights (normalized)? Set the Z-axis color range by hand in cold.

1 MeV

Start with[math] E_{gamma}[/math] = 1 MeV

Initial verification - first interaction is consistent with published attenuation coefficient.

3 MeV

Start with[math] E_{gamma}[/math] = 3 MeV

Initial verification - first interaction distribution is consistent with published attenuation coefficient.

Runing Types

nohup ../exampleN02 run1.mac > /dev/null &

Divide canvas into 2 x 5

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