Problem with gas bremsstrahlung simulation

Dear Hamideh,

Please send your questions to the FLUKA discussion list and not to me
personally. I am forwarding your mail to the list, together (only for this
time) with my answer.

High energy photons such as those of gas bremsstrahlung produce an
electromagnetic cascade (see
http://pdg.lbl.gov/2010/reviews/rpp2010-rev-passage-particles-matter.pdf
at page 27)
In a 30 cm block of tissue, the dose increases up to a maximum, and then
decreases again. There is nothing wrong about it.

Alberto

On Mon, 13 Jun 2011, Hamideh Beygzadeh Jalali wrote:

> Respectable Prof. Fasso
>
> I programmed a fluka input for production of gas bremsstrhlung in a 10 m
> straight section by setting recommended cutoffs in gasbrem.inp (FLUKA
> example). I set a 30 cm block of tissue material at 16 m from end of straight
> section and the space between end of straight section and tissue block is
> vacuum. Dose equivalent (AMB74) from photons and also all particles has been
> scored in different distances in tissue. I expected the dose equivalent
> decreases by increasing distance but the results show reverse trend. Could you
> do me a favour by guiding me where the problem is?
>
> Best Regards
> Hamideh
Received on Mon Jun 13 2011 - 18:32:43 CEST