1. NAME AND TITLE

LGH-G: Calculation of Gamma Radiation through Partially Shielded Gaps (Buildup Factor Method in Taylors Approximation).

2. CONTRIBUTOR

Gesellschaft für Kernenergieverwertung in Schiffbau und Schiffahrt mbH (GKSS), HamburgGeesthacht, Germany.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; IBM 360/370.

4. NATURE OF PROBLEM SOLVED

The flux, dose rate or related quantities resulting from a plane infinite source with cosⁿ-distribution is calculated at points behind a plane two layer shield, one layer penetrated by a cylindrical duct. The duct may be adjacent to the source or the observation point. Method is kernel integration with Taylor-approximation for build-up factor.

5. METHOD OF SOLUTION

The integration is done analytically as far as possible and numerically by application of Simpson's rule. By dividing the mesh intervals successively by two, a predefined accuracy will be obtained.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

Compilation requires 21 seconds. To calculate a 2-material shielding problem without build-up factor, 6 seconds are required for one point on shielding surface. With build-up factor 18 seconds are required on TR 440.

8. COMPUTER HARDWARE REQUIREMENTS

LGH-G is operable on the IBM 360/370 computers.

9. COMPUTER SOFTWARE REQUIREMENTS

A FORTRAN IV compiler is required.

10. REFERENCE

R. Fiebig and P. Rybaczok, "LGH-G, A Program for the Calculation of Gamma Radiation Through Partially Shielded Gaps," ORNL-tr-2831; GKSS 73/E/17 (1973).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source code and sample problem input and output.

12. DATE OF ABSTRACT

October 1974; updated August 1975.