Accession Number : AD0768414

Title :   User's Guide to Version 2 of ATR (Air Transport of Radiation).

Descriptive Note : Topical rept.,

Corporate Author : SCIENCE APPLICATIONS INC LA JOLLA CALIF

Personal Author(s) : Huszar,Louis ; Nesseler,Lonnie J. ; Woolson,William A.

Report Date : APR 1973

Pagination or Media Count : 92

Abstract : The document is intended to serve as a user's manual for Version 2 of the ATR computer program. ATR (derived from Air Transport of Radiation) provides accurate, inexpensive and easily understood solutions to radiation environment problems at all altitudes in the atmosphere with a simple set of input commands. ATR contains parametric models of a comprehensive data base of air transport results generated by discrete ordinates techniques. The data base was generated for neutrons, secondary gamma rays, prompt gamma rays, and x-rays as a function of source energy, range, detector energy, and angle to a distance of 550 g/square cm of infinite, homogeneous air. Results at all combinations of distance and density are obtained by integral mass scaling upon infinite, homogeneous air results. Effects of the interface between air and ground and of nonuniform air density are treated as perturbation corrections. ATR resides in less than 54k of core on the Univac 1108, uses no peripheral storage, functions effectively in a time-sharing environment, and typically uses less than a single computational second per problem. (Author)

Descriptors :   (*NUCLEAR RADIATION, AIR), (*COMPUTER PROGRAMMING, INSTRUCTION MANUALS), NEUTRON FLUX, GAMMA RAYS, X RAYS, COMPUTER PROGRAMS

Subject Categories : Computer Programming and Software
      Radioactiv, Radioactive Wastes & Fission Prod

Distribution Statement : APPROVED FOR PUBLIC RELEASE