From: Ioannis Kantemiris (ikantem@phys.uoa.gr)
Date: Tue Jul 25 2006 - 12:41:47 CEST
Hi All,
When I use the DETECT card I don't get the expected spectrum.
For example, I am using Co-60 source and a sphere of water, which is my
detector.
When I use NEW-DEFA I take a spectrum which has the expected type of curve
but the compton edges have wrong energy. The compton edge, based on the
spectrum is for E=1.33MeV 0.993MeV instead of the real 1.115MeV and for
E=1.17MeV is 0.832MeV instead of 0.96MeV. The 1.17 and 1.33MeV peaks are
correct to the spectrum.
But, when I use the CALORIME to the DEFAULT card, the spectrum hasn't the
expected type of curve, but one can distinguise the compton edges from the
spectrum which have the correct energy this time.
My questions are:
1)what is my fault (if there is any)?
2)why the spectrum changes by changing these DEFAULT cards? (I've read the
differences in the manual)
3)the difference between the calorime_R3.ps and calorime_R30.ps is the
radius of the water phantom (r=3cm and r=30cm respectively). Why there is
such a big change to these spectrums, considering that the newdefa.ps is
for r=3cm?
I am attaching you the input file, source.f and the ps files.
(the ps' x-axis are the 1024 channels and not the energy, 1channel=1.46KeV)
Thank you in advance.
Ioannis Kantemiris
PhD student
Physics Dep. University of Athens, Greece
ikantem@phys.uoa.gr
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