Beam characterization at the Neutron Radiography Facility (NRAD)

Conference · Wed Jul 01 04:00:00 EDT 1992

OSTI ID:10149926

Imel, G R; Urbatsch, T

An ongoing project to characterize the neutron beams at the Neutron Radiography Reactor (NRAD) is described in this paper. The effort has consisted of computer modelling with three dimensional diffusion theory to obtain a trail spectrum, foil activation measurements, and the use of SAND-II unfolding code. It was expected and found that diffusion theory will underpredict the fast flux. However, it is claimed that precise characterization of the entire spectrum is not necessary for comparisons among neutron radiography facilities; rather, the use of simple fast neutron indicators should be adequate. A specific example used at NRAD is the U-235/U-238 fission reaction rate ratio. A ratio such as this could be used in the same manner as the classic gold cadmium ratio for interfacility comparisons with regard to fast neutrons. 5 refs.

• Research Organization: Argonne National Lab., Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10149926
• Report Number(s): ANL/CP--74822; CONF-9205157--2; ON: DE92014765
• Country of Publication: United States
• Language: English

Related Subjects

07 ISOTOPE AND RADIATION SOURCES
070201
22 GENERAL STUDIES OF NUCLEAR REACTORS
220600
ACTIVATION ANALYSIS
BEAM MONITORING
COMPUTERIZED SIMULATION
D CODES
DESIGN, FABRICATION, AND OPERATION
FOILS
NEUTRON BEAMS
NEUTRON RADIOGRAPHY
NEUTRON SPECTRA
NUCLEAR REACTIONS
RESEARCH
TEST
TRAINING
PRODUCTION
IRRADIATION
MATERIALS TESTING REACTORS
THREE-DIMENSIONAL CALCULATIONS
URANIUM 235
URANIUM 238