Accession Number : AD0743180

Title :   Models of Radiation Transport in Air - the ATR Code

Descriptive Note : Final rept. 1 Apr 1970-15 Nov 1971

Corporate Author : SCIENCE APPLICATIONS INC LA JOLLA CA

Personal Author(s) : Harris, Jr , Robert J ; Lonergan, James A ; Huszar, Jr, Louis

PDF Url : AD0743180

Report Date : Nov 1971

Pagination or Media Count : 124

Abstract : The report describes the work to date on development of the ATR computer code - a user-oriented code for calculating quickly and simply radiation environment problems at all altitudes in the atmosphere. The ATR code is based on parametric models of a comprehensive data base of air base transport results which was generated using rigorous transport techniques for infinite homogeneous air. The effects of an air-ground of an air-ground interface and non-uniform air density are treated as perturbation corrections on homogeneous- air results. The data base has been generated for neutrons, secondary gamma- rays, high-energy photons and low energy photons as a function of space, energy and angle out to range of 550 gm/cm squared of air. Parametric models have been developed for all of this data base except photon angular distribution and a version of ATR has been completed for neutron and secondary gamma-ray transport.

Descriptors :   *COMPUTER PROGRAMMING, *NUCLEAR RADIATION, AIR, COMPUTER PROGRAMS, DOSE RATE, GAMMA RAY SPECTRA, GAMMA RAYS, NEUTRON FLUX, NEUTRON SPECTRUM, NUCLEAR CROSS SECTIONS, RADIATION HAZARDS, TRANSPORT PROPERTIES

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE