DLC-0093 ZZ-SKYPORT.

ZZ-SKYPORT.

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FORMAT: --

NUMBER OF GROUPS: --

NUCLIDES: Air (79%N,21%O),Ground (silicon dioxide with 5% water)

ORIGIN: Calculations of Alsmiller, Barish and Childs

WEIGHTING SPECTRUM: --

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The important functions are used to calculate the skyshine dose by integrating the product of the source and importance over source direction and energy. The source may be a function of energy and polar angle but must have azimuthal symmetry. Typical sources are accelerators.

The data are from calculations of Alsmiller, Barish, and Childs using the DOT and GRTUNCL codes. The neutron data are presented in 4 tables for neutrons up to 400 MeV at distances from 11 m to 1005 m. The photon data are given at the same distances for photons up to 14 MeV. The units in the tables are in sieverts per source particle, whereas the original tables were published with units of rem per source particle. Air was taken to be composed of 79% nitrogen and 21% oxygen and to have a density of 1.20 x 10-3 g/cm3. Ground was assumed to be silicon dioxide with 5% water by weight and to have a density of 1.8 g/cm3.

These importance functions were developed in conjunction with calculations at Oak Ridge National Laboratory in support of the 400-GeV proton accelerator which was partially built at Brookhaven National Laboratory in the early 1980s.

• R.G. Alsmiller, J. Barish, and R.L. Childs: "Skyshine at Neutron Energies Less Than 400 MeV" Particle Accelerators, 11, 131-141 (1981).

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

Developed by:   Continuous Electron Beam Accelerator Facility
                Newport News, Va., U. S. A.