**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 cos^{n}-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.

**KEYWORDS: ** GAMMA-RAY; KERNEL