Growth of mercuric iodide platelets in horizontal furnaces with the addition of polyethylene powder has been analyzed
with a 23 full factorial analysis. The factors investigated were the temperature gradient between the zones, the
source/hot zone temperature, and the amount of polyethylene powder. The crystallization zone length was chosen as
the observable. Normal probability and Lenth's plots were used to analyze the effects. Both plots show that the
temperature gradient is an active effect.
Semiconductor based thermal neutron detectors provide a compact technology for neutron detection and imaging. Such devices can be produced by externally coating semiconductor charged particle detectors with neutron reactive films that convert free neutrons into charged-particle reaction products. Commonly used films for such devices utilize the 10B(n,a)7Li reaction or the 6Li(n,a)3H reaction, which are attractive due to the relatively high energies imparted to the reaction products. Unfortunately, thin film or "foil" type thermal neutron detectors suffer from self-absorption effects that ultimately limit neutron detection efficiency. Design considerations that maximize the efficiency and performance of such devices are discussed. Linear arrays fabricated from thin-film-coated pixel detectors are presented with results.