Program - Brookhaven National Laboratory

calculating their mathematical moments in order to characterize them. Then, a reference calculation using
the whole JEFF-3.1.1 evaluation file is performed and compared with another calculation performed with
a new evaluation file, in which the data block containing the fission spectra (MF=5, MT=18) is replaced
by the one that is to be tested (one for each evaluation). A set of benchmarks is used to analyze the effects
of PFNS, covering criticality cases and mock-up cases in different neutron flux spectra (thermal spectrum,
intermediate spectrum and fast spectrum). Data from many ICSBEP experiments are used (PU-SOL-
THERM, PU-MET-FAST, PU-MET-INTER and PU-MET-MIXED) and French mock-up experiments
are also investigated (EOLE for thermal neutron flux spectrum and MASURCA for the fast neutron flux
spectrum). A sensitivity analysis is performed on some of these benchmarks with the European neutronics
code package ERANOS/PARIS in order to confirm and understand the origin of the discrepancies. The
study shows that many experiments are very sensitive to the PFNS, and that for high leakage thermal
criticality cases the discrepancy between international evaluation files spectra and Kornilov spectra can
reach 800 pcm. A neutronics analysis is proposed to explain this huge discrepancy. For fast spectrum
cases, Maslov’s and Kornilov’s spectra have a negative effect, between some dozens of pcm to around 300
pcm.
Session NF Medical Applications
Thursday March 7, 2013
Room: Central Park East at 10:30 AM
NF 1 10:30 AM
The FLUKA Code: Developments and Challenges for High Energy and Medical
Applications
A. Ferrari, and the FLUKA Collaboration
CERN
The FLUKA code is used at CERN for all beam-machine interaction and radioprotection calculations,
and for the design of future projects. These tasks require reliability and predictive power over a very
wide energy and projectile range, spanning from few tens of MeV to TeV’s, and from proton and neutron
to pion, antinucleon, (anti)hyperon, neutrino and heavy ion interactions. As a consequence sophisticated
nuclear models able to deliver reliable predictions over such a vast projectile and energy range must be
developed and constantly improved in order to fulfil the tasks. Other applications of the code are becoming
more and more popular, from space radiation to hadrotherapy calculations. The latter field is particularly
demanding and FLUKA is the core tool used at the HIT and CNAO hadrotherapy facilities in Europe. A
review of the most recent developments and achievements of the nuclear models embedded in the FLUKA
code will be given, with particular emphasis on physics problematics of interest for CERN and medical
applications.
NF 2 11:00 AM
Correlation Between Asian Dust (yellow dust) and Specific Radioactivities of Fission
Products Including in Airborne Samples in Tokushima, Shikoku Island, Japan, due to the
Fukushima Nuclear Accident
M. Sakama, Department of Radiological Science, Division of Biomedical Information Sciences, Institute
of Health Biosciences, The University of Tokushima. Y. Nagano, Department of Radiological Science,
200