Analytical dose evaluation of neutron and secondary gamma-ray skyshine from nuclear facilities
The skyshine dose distributions of neutron and secondary gamma rays were calculated systematically using the Monte Carlo method for distances up to 2 km from the source. The energy of source neutrons ranged from thermal to 400 MeV; their emission angle from 0 to 90 deg from the ver tical was treated with a distribution of the direction cosine containing five equal intervals. Calculated dose distributions D(r) were fitted to the formula; D(r) = Q exp (-r/lambda)/r. The value of Q and lambda are slowly varied functions of energy. This formula was applied to the benchmark problems of neutron skyshine from fission, fusion, and accelerator facilities, and good agreement was achieved. This formula will be quite useful for shielding designs of various nuclear facilities.
- Research Organization:
- Hitachi Engineering Company Ltd., Hitachi, Ibaraki
- OSTI ID:
- 6003049
- Journal Information:
- Nucl. Sci. Eng.; (United States), Journal Name: Nucl. Sci. Eng.; (United States) Vol. 91:3; ISSN NSENA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Atmospheric-- Radioactive Materials Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACCELERATOR FACILITIES
BARYONS
BENCHMARKS
COMPUTER CALCULATIONS
ECOLOGICAL CONCENTRATION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
EMISSION
ENVIRONMENTAL TRANSPORT
FERMIONS
GAMMA RADIATION
GAMMA TRANSPORT THEORY
HADRONS
IONIZING RADIATIONS
MASS TRANSFER
MONTE CARLO METHOD
NEUTRAL-PARTICLE TRANSPORT
NEUTRON TRANSPORT
NEUTRONS
NUCLEAR FACILITIES
NUCLEONS
RADIATION DOSE DISTRIBUTIONS
RADIATION TRANSPORT
RADIATIONS
RADIOECOLOGICAL CONCENTRATION
RADIONUCLIDE MIGRATION
SECONDARY EMISSION
SHIELDING
THERMONUCLEAR REACTORS
TRANSPORT THEORY