Abstract
Tetralin, because of its high hydrogen density relative to xylene (or toluene), was used to prepare solutions which contain different concentrations of the common scintillation chemicals, POPOP, PBBO or αNPO. Pulse height was found to increase by increasing solute concentrations, but pulse-shape discrimination properties were found to be better for less concentrated solutions. Addition of naphthalene to these solutions resulted in a marked improvement in pulse-shape discrimination properties with no noticable effect on pulse heights. An optimum choice was a scintillator consisting of 4 g PBBO and 120 g napthalene per liter of tetralin. A comparison with the widely used scintillator, NE-213, showed that it had a pulse-height response which was 14% greater than the tetralin scintillator. However, the comparison also showed that the pulse-shape discrimination figure of merit ( R 1) associated with the tetralin scintillator was twice as much as that of NE-213. In general, the tetralin-based scintillator showed promise for neutron detection purposes in the presence of a gamma-ray background.
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