Relative intensities of 2. 5 and 14-MeV source neutrons from comparative responses of U-235 and U-238 detectors

Conference · Sun May 01 00:00:00 EDT 1988

OSTI ID:7254506

Jassby, D L; Hendel, H W; Bosch, H S

The response of polyethylene-moderated U-235 fission counters is only weakly dependent on incident neutron energy, while the response of unmoderated U-238 or Th-232 fission counters increases strongly with energy. A given concentration of D-T neutrons in a mixed DT-DD source results in a unique relative detector response that depends on the parameters R14 and R2.5, where R14 is the ratio of the unmoderated U-238 and moderated U-235 detector efficiencies for a pure 14-MeV neutron source, and R2.5 is the corresponding ratio for a pure 2.5 MeV source. We have determined R14 and R2.5 using D-D and D-T neutron generators inside the TFTR vacuum vessel. The results indicate that, for our detector geometry, the ratio of U-238 to U-235 count rates should increase by a factor of about 3 when the fusion neutron source changes from pure D-D to pure D-T. This calibration is being applied to recent TFTR /open quotes/supershot/close quotes/ data, where the uncollided neutron flux in the post-beam phase contains a high proportion of D-T neutrons from the burnup of D-D tritons. 8 refs., 4 figs,. 2 tabs.

• Research Organization: Princeton Univ., NJ (USA). Plasma Physics Lab.
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 7254506
• Report Number(s): PPPL-2515; CONF-880364-27; ON: DE88011166
• Resource Relation: Conference: 7. topical conference on high temperature plasma diagnostics, Napa, CA, USA, 13 Mar 1988
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
NEUTRON DETECTORS
CALIBRATION
THERMONUCLEAR REACTIONS
NEUTRON FLUX
DEUTERIUM
FISSION NEUTRONS
NEUTRON DETECTION
TFTR TOKAMAK
THORIUM 232
TRITIUM
URANIUM 235
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DETECTION
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
HADRONS
HEAVY NUCLEI
HYDROGEN ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
MEASURING INSTRUMENTS
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUCLEOSYNTHESIS
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
RADIATION DETECTION
RADIATION DETECTORS
RADIATION FLUX
RADIOISOTOPES
STABLE ISOTOPES
SYNTHESIS
THERMONUCLEAR REACTORS
THORIUM ISOTOPES
TOKAMAK TYPE REACTORS
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES
440103* - Radiation Instrumentation- Nuclear Spectroscopic Instrumentation
700209 - Fusion Power Plant Technology- Component Development & Materials Testing