Digital Commons Network^™

Energy Resolution Analysis Of A Domestic Neutron Imager, Marissa Louise Rousseau

Master's Theses and Capstones

The calibration and correction of the Neutron Spectroscope (NSPECT) time-of-flight (ToF) system are presented. This instrument is a double-scatter telescope designed to detect neutrons and gamma rays for the identification and location of radioactive materials. The ToF resolution is 0.72 ns FWHM. Results are reported for the ToF characterization using data obtained in the laboratory. An anomalous feature in the gamma-ray energy spectra measured with NSPECT neutron detectors is examined.

A design based on NSPECT is proposed for the assay of spent nuclear fuel, where portability is increased in exchange for source location capabilities. The proposed modular device is modifiable …

A Statistical Analysis For Estimating Fish Number Density With The Use Of A Multibeam Echosounder, Madeline L. Schroth-Miller

Master's Theses and Capstones

Fish number density can be estimated from the normalized second moment of acoustic backscatter intensity [Denbigh et al., J. Acoust. Soc. Am. 90, 457-469 (1991)]. This method assumes that the distribution of fish scattering amplitudes is known and that the fish are randomly distributed following a Poisson volume distribution within regions of constant density. It is most useful at low fish densities, relative to the resolution of the acoustic device being used, since the estimators quickly become noisy as the number of fish per resolution cell increases. New models that include noise contributions are considered. The methods were applied to …