User's Guide to Version 2 of ATR (Air Transport of Radiation).
SCIENCE APPLICATIONS INC LA JOLLA CALIF
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The document is intended to serve as a users 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 gsquare 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
- Computer Programming and Software
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