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).
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.
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.
KEYWORDS: KERNEL; NEUTRON; GAMMA-RAY; DUCT GEOMETRY