Neutron- and gamma-ray spectrum measurements at the Los Alamos Critical Assembly - SHEBA

Technical Report · Wed Aug 12 04:00:00 EDT 1981

OSTI ID:5236352

Thorngate, J H; Rueppel, D W; Griffith, R V

In the summer of 1980, SHEBA, a critical assembly intended as a facility for evaluation of criticality monitors, was completed at the Los Alamos National Laboratory. The energy dependent response of criticality monitors affects how they respond to radiation fields. Since these fields will be affected significantly by local shielding, it was important to have data on the neutron and gamma ray spectra from the bare assembly, as well as transmitted through shields (13.3 cm thick steel and 40 cm thick concrete) used to modify the neutron spectrum. The measurements were made at 5 m, 14 m, and 69 m from the assembly with and without the steel or concrete shields between the assembly and the detectors. Gamma-ray spectra were measured up to 10 MeV with a 2'' x 2'' NaI(TI) detector.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5236352
• Report Number(s): UCRL-86570; CONF-811243-1; ON: DE82012729
• Country of Publication: United States
• Language: English

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