On 12.03.2015 14:15, f.h.green_at_surrey.ac.uk wrote:
>
> Hi all,
>
>
> I am trying to model the scatter produced from a low energy photon
> beam (20 keV - 30 keV) interacting with a perspex block and being
> detected by a thin layer of CdTe as my detector.
>
> A few questions I have are firstly I have chosen EM-CASCA but found I
> was getting very little scatter in my spectrum so tried
> PRECISION but I only got errors, is there a reason why PRECISION
> wouldn't work?
>
> Secondly I played around with the EMFCUT and DELTARAY options but this
> had no effect. Does anyone have any suggestions as to why you think I
> am getting such a small amount of scatter on my spectrum?
>
>
> Here are the beam characteristics I used:
>
> * 20keV photon beam
> * Momentum spread (Δp) = flat – 0GeV/c
> * Divergence type (Δφ) = Gauss – 100.00mrad
> * Beam shape (x-axis) = Gauss – FWHM 0.05cm
> * Beam shape (y-axis) = Gauss – FWHM 0.05cm
>
> The initial beam position was at -10cm on the z axis and the number of
> start events was 1E7.
>
>
> Thank you for any suggestions you may have
>
>
> Faith
>
>
Hi,
It looks like some kind of a bug with low neutrons in DEFAULTS where
LOW-NEUT is activated by default,
Try to use EM-CASCA and photon particle transport threshold in 1 keV
(EMFCUT card).
Best regards,
Mikhail
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Received on Thu Mar 12 2015 - 20:23:22 CET