Re: the missing x-rays?

 From the output file you can see that the default Pcut in Gd2O3 and Al2O3 is 0.333 MeV.
Hence the photons below this energy are not further transported,
but deposits their energy on the spot. So, You
have to apply EMFCUT card in the input and set the Pcut
value at say 20 keV so that you can detect the
photons from 30 keV to 350 keV.
Hope this helps.

With Regards,
S. Chatterjee
Scientific Officer,
TLD Unit, BARC
Variable Energy Cyclotron Centre,
1/AF, Bidhannagar,Kolkata-64
Off:+91-33-23184207
Fax:+91-33-23346871

----- Original Message -----
From: ???<dengmw_at_student.sysu.edu.cn>
Date: Friday, May 20, 2011 12:15 pm
Subject: the missing x-rays?

> Dear all,
>
> Now I am using a neutron source (with energy equals about 1ev).
> The target is Gd2O3(the mass number of Gd is 156).
> Basically,the reaction is as follows:
> Gd-156 + n -> Gd-157(*)
> Gd-157(*) -> Gd-157 + gamma .
> And Gd-157* has a probability of emitting internal conversion
> electrons and the
> associated x-rays,which leads to
> Gd-157(*) -> Gd-157 + conversion e + x-ray .
> And it is referred that the energy of these x-rays range
> from about 30 kev to 350 kev.I use FLUKA to simulate this process.
> I detect the garma fluence transporting from Gd2O3 to Al2O3
> (both are regions in my input files), but no gamma with the energy
> lower than about 300 kev is detected.
> So where are the missing x-rays?
> My input files and output files are attached.
>
> Yours,
> Danny
Received on Fri May 20 2011 - 12:56:03 CEST