Accession Number : AD0645929

Title :   A SOURCE-ENERGY INTEGRATION PROGRAM DESIGNED TO OPERATE ON THE NGM CODE OUTPUT,

Corporate Author : ARMY NUCLEAR DEFENSE LAB EDGEWOOD ARSENAL MD

Personal Author(s) : Lacetera,Joseph

Report Date : JAN 1967

Pagination or Media Count : 81

Abstract : The Los Alamos Scientific Laboratory (LASL) is preparing a Neutron-Gamma Monte Carlo (NGM) transport code that will provide differential data for use in mapping the initial radiation environment created by a nuclear detonation. The NGM output provides fluxes at a series of detectors, normalized to one neutron which leaves the source in the given source-energy solid-angle group. By appropriately weighting the output and integrating it with respect to the variables, the radiation field of given weapons can be mapped. A set of codes has been generated at the US Army Nuclear Defense Laboratory to integrate the fluxes over the variables (source energies and angles, detector energies, angles, and times), with appropriate weighting where necessary to provide input for special problems. This report describes a digital computer program written for the GE 225 computer (16K core storage and 6 magnetic tape drives) in the General Assembly Program (GAP) language. The program integrates the LASL NGM radiation transport code differential flux output with the source-energy variable weighted by a user-supplied function. The resultant output is the flux at the detectors due to the user-supplied source-energy spectrum. The method of performing the weighted source-energy integration operation and the use of checksums to minimize error are given through the use of a flow diagram with complementary textual description, and the GAP source-deck listing. The method of running the program and how to respond to the error signals is also described. (Author)

Descriptors :   (*MONTE CARLO METHOD, *NEUTRON CAPTURE GAMMA RAYS), (*COMPUTER PROGRAMS, *NEUTRON TRANSPORT THEORY), TRANSPORT PROPERTIES, NUCLEAR RADIATION, DIGITAL COMPUTERS

Subject Categories : Computer Programming and Software
      Computer Hardware
      Nuclear Radiation Shield, Protection & Safety

Distribution Statement : APPROVED FOR PUBLIC RELEASE