HIGH EFFICIENCY MONTE CARLO CALCULATION OF Na$sup 24$ AND BREMSSTRAHLUNG GAMMA PENETRATION. Paper 16 of PAPERS FROM SEVENTH SEMIANNUAL SHIELDING INFORMATION MEETING, OCTOBER 14-15, 1959
TRG's slab gamma -ray code, TRIGR-P, was modified to give improved results for low energies above the cross section minimum in heavy materials. A series of calculations for transmission of Na/sup 24/ radiation (2.75- and 1.38- Mev photons) through aluminum, iron, and lead was run for five to six thicknesses of from 2 to 12 mean free paths at the higher energy for six incident angles varying from normal to 75 deg with the normal. There were 192 problems for which both doses and spectra were obtained. The standard deviations for the doses were about 5% for 0, 15, and 30 deg incidence and about 10% for the larger angles. A few problems gave 15% deviations or more for 60 to 75 deg on aluminum. The Morton similarity transformation was used to make it possible to obtain results for several thicknesses at once. Spectra from 8- and 10-Mev bremsstrahlung radiation transmitted through 4 and 6 in. of lead were computed and compared with the experimental results. (auth)
- Research Organization:
- TRG, Inc., Syosset, N.Y.
- NSA Number:
- NSA-15-010335
- OSTI ID:
- 4085884
- Report Number(s):
- TID-6302(Paper 16)
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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