Dear Masoomeh,
You will find many pointers and hints in the comments in the FLUKA manual to help you with modeling photoneutron production and transport. You should use LAM-BIAS card as explained in the comments to the PHOTONUC page of the manual:
http://www.fluka.org/fluka.php?id=man_onl&sub=61
Also take a look at the page for the PHYSICS card, SDUM options COALESCEnce and EVAPORATion. It is also recommended that users set the transport and production thresholds of the electromagnetic radiation using EMF-CUT card (though the default values may be adequate for your problem).
A possible problem with your input is that AUXSCORE filtering by both photons and neutrons is applied USRBIN 43.
Generally, if you are only interested in prompt radiation fields, it is not necessary to be calculating activation, but if you are interested in activation itself, the lecture slides from recent FLUKA courses list the options, for example:
https://indico.cern.ch/event/442634/contributions/1096523/attachments/1186817/1721027/18_Activation_2015.pdf
You can also see working examples in various course exercises:
https://indico.cern.ch/event/296741/contributions/1657823/
Regards,
George
----- Original Message -----
From: "Masoomeh Yarmohammadi Satri" <masoomeh.yarmohammadi.satri_at_cern.ch>
To: "FLUKA Discussion List" <fluka-discuss_at_fluka.org>
Cc: "Joachim Vollaire" <joachim.vollaire_at_cern.ch>
Sent: Saturday, August 5, 2017 9:36:02 AM
Subject: [fluka-discuss]: PhotoNeutron
Dear All,
A Titanium-Copper target was exposed an 8MeV electron beam and the structure was followed with a 10cm Lead wall. Since the cross section of photo-neutron production increases with energy and mass of material (The cross section increases for more than 6.8 MeV incident energy for heavy materials like Lead), I want to consider the photoneutron production in the simulation. I have added the PHOTONUC card in the Physics and considered from Vacuum to _at_LASTMAT. In the Scoring I defined a USRBIN, part DoseEQ card with an AUXSCORE on Photon (set AMB74) and an AUXSCORE on Neutron (I did not have any idea about Set section of Neutron) were set.
The files are attached.
Please let me know if I need to add/activate any other card for the activation and cosidering the photo-neutron mechanism in the Fluka simulation Monte Carlo code?
Best regards & Cheers,
Masoomeh
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Received on Sun Aug 06 2017 - 21:57:03 CEST