TRAPPING OF THERMAL NEUTRONS. I. CRITERIA OF HIGHLY TRAPPING MEDIA

Journal Article · Sun Jul 01 04:00:00 EDT 1962 · Nippon Genshiryoku Gakkaishi (Japan)

OSTI ID:4781150

Otsuka, M

A comparative study of trapping media is made by an analytical approach in order to derive criteria of highly trapping media. Spherical and cylindrical media are analyzed in the two-group diffusion theory. A criterion is that the thermal neutron diffusion coefficient of a trapping medium must be much smaller than both the slowing-down length and the thermal neutron diffusion length, provided that both lengths should be modified in case of a finite cylinder. Small flux-trapping reactors can be realized by a medium whose characteristic lengths are both short. Calculated values of the trapping effectiveness and the optimum radius of ordinary moderators are given. Although comparison with experiments is not possible, it is suggested that the trapped thermal neutron flux definitely cannot be larger than the flux at the periphery of a trapping medium by a factor of ten. (auth)

• Research Organization: Electric Power Development Co., Ltd., Japan
• NSA Number: NSA-16-031059
• OSTI ID: 4781150
• Journal Information: Nippon Genshiryoku Gakkaishi (Japan), Journal Name: Nippon Genshiryoku Gakkaishi (Japan) Vol. Vol: 4; ISSN NGEGA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALKYL RADICALS
BIBLIOGRAPHY
BIOCHEMISTRY
CATALYSIS
CHEMICAL REACTIONS
CYLINDERS
DIFFUSION
DIFFUSION LENGTH
ELECTRONS
ENERGY RANGE
FISSION PRODUCTS
FOOD
GAMMA RADIATION
HYDROCARBONS
INSECTS
INTERACTIONS
MODERATORS
NEUTRON FLUX
NUMERICALS
OXIDATION
PHYSICS
RADIATION CHEMISTRY
RADIATION DOSES
RADIATION EFFECTS
RADIATION SOURCES
REACTORS
SLOWDOWN
SOILS
SPHERES
STERILIZATION
THERMAL NEUTRONS
TRACER TECHNIQUES
TRAPS