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Hybrid Skyshine Calculations for Complex Neutron and Gamma-Ray Sources

J. Kenneth Shultis

Nuclear Science and Engineering

Volume 136 / Number 2 / October 2000 / Pages 294-304


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A two-step hybrid method is described for computationally efficient estimation of neutron and gamma-ray skyshine doses far from a shielded source. First, the energy and angular dependence of radiation escaping into the atmosphere from a source containment is determined by a detailed transport model such as MCNP. Then, an effective point source with this energy and angular dependence is used in the integral line-beam method to transport the radiation through the atmosphere up to 2500 m from the source. An example spent-fuel storage cask is analyzed with this hybrid method and compared to detailed MCNP skyshine calculations.

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