Spontaneous decay of cobalt-60 and random BEAMPOS?

From: Georgios Tsiledakis <tsiledak_at_mail.cern.ch>
Date: Thu, 21 Apr 2010 17:38:57 +0200

Dear FLUKA experts,

        I have one spherical gas volume ,69cm radius, Ar-CH4 2%.
The outside spherical shell of 1cm width (Rin=69cm, Rout=70cm) is made
of a compound material Copper + 1 % Cobalt-60.
Cobalt has 2 gamma rays with energies of 1.17 and 1.33 MeV, and these
Compton in Copper creates in our (gas)detector a background.
        One trick to estimate that background is to place by hand an
photon of 1.33 MeV in the middle of the spherical copper shell via BEAM
cards. That what I did and with the EVENTBIN card I am able to plot the
energy deposition
per primary.

        My questions are the following:

Is any way to implement easy this spontaneous decay of Cobalt and use it
as a gamma BEAM?
I do know know how to use these gammas from the cobalt as a BEAM imput
card... Should I use in the beginning Co-59 and activate it with a neutron
source? If yes, what energy? I tried to use RADDECAY but in vein...
How I could be sure the atoms of cobalt that are ramdomly distributed
being 1%
in the copper shell decayed and transport gammas/betas in the gas?
I am interested to use the same EVENTBIN file...
I provide the input I have used with photon energy of 23 keV just for

How I could force the isotropic photon of the input I use have not one
specific position given by BEAMPOS card BUT it can come from every
possible position of the spherical shell made of copper (Rin=69cm,
Rout=70cm)? I do not know fortran and I wonder if one of you has any
source.f who can do that.

Thank you very much in advance

Every piece of help is highly appreciated

Best regards

Georgios Tsiledakis

Received on Thu Apr 22 2010 - 10:09:38 CEST

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