Dear FLUKA experts,
I'm trying to determine air activation from photonuclear interactions in
a bremsstrahlung field generated by 18 MeV electrons.
I'm scoring via RESNUCLE over a large air volume (some m^3). For CPU
time reduction i have set a high EMFCUT (8 MeV).
I tried to bias the production of O-15 (production threshold 15.7 MeV)
and N-13 (production threshold 10.5 MeV) with LAM-Bias, but even with a
reduction of the interaction length for photons in air by a factor of
10^9 i still can't see any O-15 in the output and N-13 has still a large
statistical uncertainty after 5E9 primary electrons.
The activation products generated in the air volume by capture of
photoneutrons have good statistics although i did not apply any biasing
here.
That is my LAM-BIAS card:
LAM-BIAS 1E-9 AIR PHOTON
Is a factor of 10^9 overbiased or still too low here?
Are there any hints for biasing such problems?
Thank you in advance and regards
Felix
--
Felix Horst, B.Sc.
Institut für Medizinische Physik und Strahlenschutz (IMPS)
Technische Hochschule Mittelhessen
Wiesenstr. 14, 35390 Gießen
Raum D10.12a
Telefon: 0641 309 2642
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Received on Mon Apr 20 2015 - 12:01:12 CEST