Problem with gas bremsstrahlung simulation

From: Alberto Fasso' <>
Date: Mon, 13 Jun 2011 06:09:05 -0700 (PDT)

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
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.


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

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