Published 1997 | Version v1
Report Restricted

Self shielding in cylindrical fissile sources in the APNea system

Creators

Description

In order for a source of fissile material to be useful as a calibration instrument, it is necessary to know not only how much fissile material is in the source but also what the effective fissile content is. Because uranium and plutonium absorb thermal neutrons so Efficiently, material in the center of a sample is shielded from the external thermal flux by the surface layers of the material. Differential dieaway measurements in the APNea System of five different sets of cylindrical fissile sources show the various self shielding effects that are routinely encountered. A method for calculating the self shielding effect is presented and its predictions are compared with the experimental results

Availability note (English)

MF available from INIS under the Report Number; Also available from OSTI as DE97002630; NTIS; US Govt. Printing Office Dep.

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Additional details

Publishing Information

Imprint Pagination
13 p.
Report number
CONF-970126--8

Conference

Title
5. nondestructive assay/nondestructive examination waste characterization conference.
Dates
14-16 Jan 1997.
Place
Salt Lake City, UT (United States).

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
28059334
Subject category
S07: ISOTOPES AND RADIATION SOURCES; S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
Resource subtype / Literary indicator
Conference, Numerical Data
Descriptors DEI
ABSORPTION; ATTENUATION; CALCULATION METHODS; CALIBRATION; CROSS SECTIONS; CYLINDRICAL CONFIGURATION; EXPERIMENTAL DATA; FISSILE MATERIALS; MATHEMATICAL MODELS; NEUTRON FLUX; NEUTRON SOURCES; PLUTONIUM 239; RADIOCHEMICAL ANALYSIS; SELF-SHIELDING; THERMAL NEUTRONS; URANIUM 235
Descriptors DEC
ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; BARYONS; CHEMICAL ANALYSIS; CONFIGURATION; DATA; ELEMENTARY PARTICLES; EVEN-ODD NUCLEI; FERMIONS; FISSIONABLE MATERIALS; HADRONS; HEAVY NUCLEI; INFORMATION; INTERNAL CONVERSION RADIOISOTOPES; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MATERIALS; MINUTES LIVING RADIOISOTOPES; NEUTRONS; NUCLEI; NUCLEONS; NUMERICAL DATA; PARTICLE SOURCES; PLUTONIUM ISOTOPES; QUANTITATIVE CHEMICAL ANALYSIS; RADIATION FLUX; RADIATION SOURCES; RADIOISOTOPES; SORPTION; SPONTANEOUS FISSION RADIOISOTOPES; URANIUM ISOTOPES; YEARS LIVING RADIOISOTOPES

Optional Information

Contract/Grant/Project number
Contract AC05-96OR22464
Funding organization
USDOE, Washington, DC (United States).