Monte Carlo and discrete ordinates calculations of 14-MeV neutrons streaming through a stainless steel duct: Comparison with experiment I
Measured and calculated neutron and gamma-ray energy spectra from approx. =14-MeV neutrons streaming through a stainless steel duct having a length-to-diameter ratio of 4.6 are compared. The 1.45-m-long duct is imbedded in a concrete block. The spectra were measured with an NE-213 liquid scintillator as a function of detector location relative to the mouth of the duct. The calculated data were obtained using the Monte Carlo code MCNP and the discrete ordinates code DOT 4.3. The calculations were performed using a two-dimensional cylindrical model of the experiment with symmetry about the duct axis. The measured and calculated neutron and gamma-ray spectra are compared at two distances from the mouth of the duct and at detector locations on and off the duct axis. The neutron-spectra calculated with MCNP agree with the measured data with approx. =5 to 50% at all detector locations. The data calculated using the discrete ordinates method are in good agreement with the experiment for the cases where the detector is on axis but are in poor agreement at the off-axis detector locations. The gamma-ray spectra calculated with both radiation transport methods are in good agreement (approx. =5 to 25%, depending on photon energy) with the measured spectra.
- Research Organization:
- Oak Ridge National Laboratory, P.O. Box X, Oak Ridge, TN 37831
- OSTI ID:
- 5794857
- Journal Information:
- Nucl. Sci. Eng.; (United States), Vol. 92:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NEUTRONS
ABSORPTION
STAINLESS STEELS
NEUTRON TRANSPORT
COMPUTERIZED SIMULATION
DISCRETE ORDINATE METHOD
DUCTS
GAMMA DETECTION
GAMMA SPECTRA
LIQUID SCINTILLATION DETECTORS
MEV RANGE 10-100
MONTE CARLO METHOD
NEUTRON DETECTION
NEUTRON SPECTRA
PHOTONS
RADIATION STREAMING
RESEARCH PROGRAMS
SYMMETRY
ALLOYS
BARYONS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
DETECTION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRONS
IRON ALLOYS
IRON BASE ALLOYS
MASSLESS PARTICLES
MEASURING INSTRUMENTS
MEV RANGE
NEUTRAL-PARTICLE TRANSPORT
NUCLEONS
RADIATION DETECTION
RADIATION DETECTORS
RADIATION TRANSPORT
SCINTILLATION COUNTERS
SIMULATION
SPECTRA
STEELS
654003* - Radiation & Shielding Physics- Neutron Interactions with Matter