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[Program Service | Recent programs]

CCC-0179 ATR. (Abstract last modified 04-NOV-1981)


ATR, Radiation Transport Models in Atmosphere at Various Altitudes

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Abstract Table of Contents:

NAME | COMPUTER | PROBLEM | SOLUTION | RESTRICTIONS | CPU | FEATURES | AUXILIARIES | STATUS | REFERENCES | REQUIREMENTS | LANGUAGE | OPERATING SYSTEM | OTHER RESTRICTIONS | AUTHOR | MATERIAL | CATEGORIES |

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1. NAME OR DESIGNATION OF PROGRAM - ATR. 
Models of Radiation Transport in Air. 


2. COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -

To request or retrieve programs click on the one of the active versions below. A password and special authorization is required.

Explanation of the status codes.

Program-name         Package-ID  Status
ATR                  CCC-0179/01 Tested

Machines used:
Package-ID     Orig.Computer                       Test Computer
CCC-0179/01    IBM 370/168                         IBM 370/168

3. DESCRIPTION OF PROBLEM OR FUNCTION - ATR is a user-oriented code for calculating quickly and simply radiation environment problems at all altitudes in the atmosphere. The code is based on parametric models of a comprehensive data base of air transport results which were generated using discrete ordinates transport techniques for infinite homogeneous air. The effects of air-ground interface and non-uniform air density are treated as perturbation corrections on homogeneous air results. ATR includes parametric models for neutrons and secondary gamma rays as a function of space, energy and source- target angle out to angles of 550 g/cm2 of air.
ATR contains parameterizations of infinite medium air transport of neutrons and secondary gamma rays and correction factors for the air-ground interface and high altitude exponential air. It responds to a series of user-oriented commands which specify the source, geometry and print options to output a variety of useful air transport information, including energy-angle dependent fluence, dose, current, and isodose ranges.


4. METHOD OF SOLUTION - The version 3 differs from earlier versions in that version 3 contains the parameterization of the new neutron and secondary gamma rays data base that was calculated using the latest DNA approved cross sections for air. Other improvements to the ATR code include: parameterization and inclusion into ATR of new air- over-ground correction factors, low energy x-rays calculations, new fission source, and new convenience options.


5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM - ATR takes approximately 36,000 decimal words of storage. This can be lessened by overlaying different parts of the code.


6. TYPICAL RUNNING TIME - Typical running time on the UNIVAC 1108 is on the order of seconds where a problem is defined as a typical response calculation starting with the specification of an energy dependent source and complete source-target geometry configuration. The sample problem ran 2 minutes on the IBM 360/91 and 20 sec on the IBM 370/195.


7. UNUSUAL FEATURES OF THE PROGRAM - 


8. RELATED AND AUXILIARY PROGRAMS - 


9. STATUS
CCC-0179/01: 04-NOV-1981 Tested at NEADB


10. REFERENCES  - 
CCC-0179/01:
- "Version 3 of Air Transport of Radiation (ATR)"
  DNA 3819F (July 1975).
- L. Huszar, L.J. Nesseler, W.A. Woolson:
  "User's Guide to Version 2 of ATR (Air Transport of Radiation)"
  DNA 3144Z (April 1973).
- R.J. Harris, Jr., J.A. Lonergan, L. Huszar:
  "Models of Radiation Transport in Air - The ATR Code"
  DNA 28031 (May 1972).


11. MACHINE REQUIREMENTS - ATR is fully self contained and machine independent. It required 32K decimal storage on the UNIVAC 1108. It requires no auxiliary storage and uses standard channel configuration on IBM 370 330k bytes of core memory are required.


12. PROGRAMMING LANGUAGE(S) USED -
CCC-0179/01: FORTRAN-IV 


13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED - All routines are in FORTRAN IV and independent of machine. No special operating system or machine dependent routines are required.


14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS - 


15. NAME AND ESTABLISHMENT OF AUTHOR - 
Science Applications, Inc, 
La Jolla, California 


16. MATERIAL AVAILABLE -
CCC-0179/01:
CCC0179_01.001    ATR SOURCE (F4)                                  9411 records
CCC0179_01.002    ATR SAMPLE PROBLEM INPUT                           67 records
CCC0179_01.003    ATR SAMPLE PROBLEM OUTPUT                         512 records
CCC0179_01.004    JCL                                                52 records


17. CATEGORIES  - 

- G. Radiological Safety, Hazard and Accident Analysis
- R. Environmental and Earth Sciences


Keywords: EARTH ATMOSPHERE, GAMMA RADIATION, NEUTRON TRANSPORT THEORY, PHOTON TRANSPORT, RADIOACTIVITY TRANSPORT, SECONDARY EMISSION

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