1. NAME AND TITLE

SKYPORT: Skyshine Importance Functions for Neutrons and Gamma Rays.

2. NAME AND TITLE OF DATA RETRIEVAL PROGRAMS

None.

3. CONTRIBUTORS

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

Continuous Electron Beam Accelerator Facility, Newport News, Va.

4. HISTORICAL BACKGROUND INFORMATION

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.

5. APPLICATIONS OF THE DATA

The importance 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.

6. SOURCE AND SCOPE OF DATA

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.

7. DISCUSSION OF THE DATA RETRIEVAL PROGRAMS

Does not apply.

8. DATA FORMAT AND COMPUTERS

ASCII files on diskette for MS DOS computers.

9. TYPICAL RUNNING TIME

Does not apply.

10. REFERENCES

a. Included in package:

R. G. Alsmiller, J. Barish, and R. L. Childs, Skyshine at Neutron Energies Less Than 400 MeV, ORNL/TM-7512, Oak Ridge National Laboratory (Oct. 1980).

b. Background information:

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

11. CONTENTS OF LIBRARY

Included are the referenced document (a) and 1 DS/DD 360 K 5.25-in diskette for IBM PC compatible computers.

12. DATE OF ABSTRACT

November 1989.