1. NAME AND TITLE

LG-H: Ray Analysis Cylindrical Duct Kernel Code for Neutrons and Gamma Rays.

LG-H is also included in the OECD NEA Data Bank (Abstract No. 124).

2. CONTRIBUTORS

Shielding Codes Group, Tokai Establishment, Japan Atomic Energy Research Institute (JAERI), Tokai, Ibaraki, Japan.

Hitachi Central Research Laboratory, Hitachi Ltd.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; IBM 7090.

4. NATURE OF PROBLEM SOLVED

LG-H was designed to solve problems connected with gamma rays and neutrons streaming through straight cylindrical ducts. Fluxes and doses are studied at the duct exit surface of the shield barrier from an infinite plane source on the other side of the shield.

5. METHOD OF SOLUTION

The infinite source region is divided into 4 parts and the contribution of each part is calculated separately by the ray analysis method. The total dose at the detector and the contribution to it of each part of the plane source are calculated, using an assumed kernel, by varying the parameters, including the source angular distribution, position of the detector, duct radius, duct length, energy of radiation and materials of the shield.

6. RESTRICTIONS OR LIMITATIONS

The following limits apply:

Duct radius < 100 cm.

Distance < 100 cm.

Duct length < 100 cm.

Maximum angular dependency 100

Maximum buildup factor constant 100

7. TYPICAL RUNNING TIME

Typical running time is less than 2 seconds per case.

Estimated running time for sample problems: 0.01 hour on the IBM 7090.

8. COMPUTER HARDWARE REQUIREMENTS

A 32 K computer with 3 tape units is required. The code was designed to be run on the IBM 7040, 7044, and 7090 computers.

9. COMPUTER SOFTWARE REQUIREMENTS

The code has been compiled and executed on the IBM FORTRAN IV IBJOB Monitor in the IBSYS Operating System. Only I-O and systems tape assignments were made.

10. REFERENCE

M. Kitazume, A. Tsuruo, and M. Shindo, "Gamma Rays and Neutrons Streaming About a Cylindrical Duct by the Ray Analysis Method," Informal Memo (1966).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

January 1968; updated July 1981.