Spectrum tailoring of the neutron energy spectrum in the context of delayed neutron detection

Conference · Fri Jan 01 04:00:00 EST 2010

OSTI ID:1016108

Koehler, William E ^[1]; Tobin, Steve J ^[1]; Sandoval, Nathan P ^[1]; Fensin, Mike L ^[1]

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1. Los Alamos National Laboratory

For the purpose of measuring plutonium mass in spent fuel, a delayed neutron instrument is of particular interest since, if properly designed, the delayed neutron signal from {sup 235}U is significantly stronger than the signature from {sup 239}Pu or {sup 241}Pu. A key factor in properly designing a delayed neutron instrument is to minimize the fission of {sup 238}U. This minimization is achieved by keeping the interrogating neutron spectrum below {approx} 1 MeV. In the context of spent fuel measurements it is desirable to use a 14 MeV (deuterium and tritium) neutron generator for economic reasons. Spectrum tailoring is the term used to describe the inclusion of material between the 14 MeV neutrons and the interrogated object that lower the neutron energy through nuclear reactions and moderation. This report quantifies the utility of different material combination for spectrum tailoring.

• Research Organization: Los Alamos National Laboratory (LANL)
• Sponsoring Organization: DOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 1016108
• Report Number(s): LA-UR-10-03713; LA-UR-10-3713
• Country of Publication: United States
• Language: English

Related Subjects

11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION
DELAYED NEUTRONS
DETECTION
DEUTERIUM
ECONOMICS
FISSION
MINIMIZATION
NEUTRON GENERATORS
NEUTRONS
NUCLEAR REACTIONS
PLUTONIUM
SPENT FUELS
TRITIUM