CHARACTERISTICS OF REFLECTORS

Journal Article · Sun May 01 04:00:00 EDT 1960 · J. Atomic Energy Soc. Japan

DOI:https://doi.org/10.3327/jaesj.2.276· OSTI ID:4154007

Otsuka, M

The concept of albedo is defined independently of cores in the two-group diffusion theory, and it consists of three reflection coefficients. The non- slowing-down reflection coefficient ( beta /sub f/) represents the fraction of the fast-group neutrons entering a reflector which are reflected in the same fast group; the slowing-down reflection coefficient ( beta /sub tf/) gives the fraction of the neutrons thermalized and reflected. For entering thermal neutrons, the thermal reflection coefficient ( beta /sub t/) exists. The albedos of commonly used reflectors and other materials are calculated in the spherically symmetric case, and their characteristics are discussed. The reflecting power of H/sub 2/O is markedly different; in this case nearly half the reflected neutrons are thermal when fast-group neutrons enter the reflector. The albedo of a multi- layer reflector is also formulated. The thin Be reflector surrounded with graphite is effectively the same as the thick Be reflector. The method studied can be extended for the multi-group diffusion theory. (auth)

• Research Organization: Electric Power Development Co. Ltd., Japan
• Sponsoring Organization: USDOE
• NSA Number: NSA-14-018584
• OSTI ID: 4154007
• Journal Information: J. Atomic Energy Soc. Japan, Journal Name: J. Atomic Energy Soc. Japan Vol. Vol: 2
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

ALBEDO
BERYLLIUM MODERATOR
CONFIGURATION
DIFFUSION
FAST NEUTRONS
GRAPHITE MODERATOR
GROUP THEORY
REACTOR CORE
REACTOR TECHNOLOGY
REACTORS
REFLECTION
REFLECTORS
SLOWDOWN
SPHERES
WATER MODERATOR
ZONES