Abstract
The objectives of this research were to: 1) design and ics. operate a neutron detection system, 2) measure delayed neutron energy spectra of [] [] and [] and 3) compare these results to a summation spectra using ENDFJB-VI data. Each isotope was irradiated using the Texas A&M Nuclear Science Center Reactor (NSCR). Three proton recoil detectors, operating individually, in conjunction with MCNP calculated response functions, were used to measure the delayed neutron energy spectra of each isotope. The measured [] spectrum was compared to those measured by Batchelor, Fieg, and Sloan and Woodruff for confirmation of the procedure and accuracy of the newly measured spectrum. The 235U spectrum had the some structure, shape, and features as the prior measurements. The average energy found for [] [] and [] were 408keV, 419keV, and 42211eV respectively. The measured spectra for each of the isotopes were also compared to a summation calculation involving the eighteen most prominent precursors using Pn values, yields, and individual precursor spectra from ENDF/B-VI. This comparison showed agreement ([] 5%) with the summation calculation from the ENDF/B-VI database.
Comfort, Christopher M. (1998). Delayed neutron energy spectrum measurements of actinide waste isotopes. Master's thesis, Texas A&M University. Available electronically from
https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1998 -THESIS -C658.