Date of Award
12-2014
Document Type
Thesis
Degree Name
Master of Science (MS)
Legacy Department
Environmental Engineering and Earth Science
Committee Chair/Advisor
Timothy A. DeVol
Committee Member
Zane W. Bell
Committee Member
Lindsay Shuller-Nickles
Abstract
The Cherenkov effect in optically clear media of varying indices of refraction and composition was investigated for quantification of fast neutrons. The ultimate application of the proposed detection system is criticality monitoring. The optically clear medium, composed of select target nuclei, was coupled to a photomultiplier tube. Neutron reaction products of the target nuclei contained within the optical medium emit beta particles and gamma rays that produce Cherenkov photons within the medium which can be detected. Assessed media include quartz (SiO2), sapphire (Al2O3), spinel (MgAl2O4), and zinc sulfide (ZnS), which were irradiated with un-moderated 252Cf. Monte Carlo N-Particle (MCNP) code simulations were conducted to quantify the neutron flux incident on the media. High resolution gamma-ray spectroscopic measurements of the samples were conducted to verify the MCNP estimate. The threshold reactions of interest were 28Si (n, p) 28Al, 27Al (n, p) 27Mg, 24Mg(n, p)24Na, and 64Zn(n, p)64Cu which have neutron reaction cross sections in the 1 to 10 MeV range on the order of 0.1 barn. The detection system offers a unique way to measure a criticality event; it can count in place, making retrieval by emergency personnel unnecessary.
Recommended Citation
Millard, Matthew, "FAST FISSION NEUTRON DETECTION USING THE CHERENKOV EFFECT" (2014). All Theses. 2047.
https://tigerprints.clemson.edu/all_theses/2047