Computational techniques in gamma-ray skyshine analysis
Two computer codes were developed to analyze gamma-ray skyshine, the scattering of gamma photons by air molecules. A review of previous gamma-ray skyshine studies discusses several Monte Carlo codes, programs using a single-scatter model, and the MicroSkyshine program for microcomputers. A benchmark gamma-ray skyshine experiment performed at Kansas State University is also described. A single-scatter numerical model was presented which traces photons from the source to their first scatter, then applies a buildup factor along a direct path from the scattering point to a detector. The FORTRAN code SKY, developed with this model before the present study, was modified to use Gauss quadrature, recent photon attenuation data and a more accurate buildup approximation. The resulting code, SILOGP, computes response from a point photon source on the axis of a silo, with and without concrete shielding over the opening. Another program, WALLGP, was developed using the same model to compute response from a point gamma source behind a perfectly absorbing wall, with and without shielding overhead. 29 refs., 48 figs., 13 tabs.
- Research Organization:
- Kansas Engineering Experiment Station, Manhattan (USA)
- DOE Contract Number:
- AC05-76OR00033
- OSTI ID:
- 6077591
- Report Number(s):
- DOE/OR/00033-T417; ON: DE89010156; TRN: 89-011613
- Resource Relation:
- Other Information: Thesis (M.S.). Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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