
Accession Number : AD0672719
Title : TRANSPORT CALCULATIONS PERTINENT TO SATELLITE DETECTION OF DELAYED GAMMAS FROM AN ATMOSPHERIC NUCLEAR EXPLOSION,
Corporate Author : RAND CORP SANTA MONICA CALIF
Personal Author(s) : Hubbard,H. W. ; Marcum,J. I.
Report Date : JUN 1968
Pagination or Media Count : 44
Abstract : A solution to the problem of measuring the transmission of delayed fission product gamma rays from atmospheric nuclear explosions from source to detector. Assuming detection by a VELA satellite or equivalent, calculations were made by means of a modification of the RAND Xray and gammaray Monte Carlo program (see RM3595PR). For each of ten equal angular zones, ranging from directly below the detector to the horizon, gamma fluxes were computed at two satellite altitudes110,000 and 35,000 kmfor source heights of 55,000 ft, 65,000 ft, 75,000 ft, and 100,000 ft. Five thousand Monte Carlo histories were computed for each problem, requiring about 2.5 hours on the IBM 7044 for each. Numerical results are presented tabularly, in histograms, and with smoothed curves. Average standard deviation is 20 percent, and smoothing cuts it approximately 10 percent. A second run of 5000 histories was made for the 65,000ft source, using a new set of initial random numbers, to check this deviation. Comparisons are made with results obtained using infinite medium buildup factors. (Author)
Descriptors : (*NUCLEAR EXPLOSIONS, DETECTION), GAMMA RAYS, GAMMA COUNTERS, SCIENTIFIC SATELLITES, RECONNAISSANCE SATELLITES, MONTE CARLO METHOD, COMPUTER PROGRAMMING, FISSION PRODUCTS, AIRBURST, HIGH ALTITUDE
Subject Categories : Unmanned Spacecraft
Distribution Statement : APPROVED FOR PUBLIC RELEASE