Excellent Pulse Research Articles

6Li-loaded liquid scintillators with pulse shape discrimination

Excellent pulse height and pulse shape discrimination performance has been obtained for liquid scintillators containing as much as 10 wt.% (6)Li-salicylate dissolved in a toluene-methanol solvent system using naphthalene and 9,10 diphenylanthracene as intermediate and secondary solutes. This solution has improved performance at higher (6)Li-loading than solutions in dioxane-water solvent systems, and remains stable at temperatures as low as -10 degrees C. Cells as large as 5 cm in diameter and 15.2 deep have been prepared which have a higher light output for slow neutron detection than (10)B-loaded liquids. Neutron efficiency calculations are also presented.

Thin film of organic fluorescent materials for simple detection of alpha rays

The vacuum deposited and sprayed thin film of organic fluorescent materials as a detector is available for a simple detection of alpha rays. The films of 1, 12-benzperylene and sodium salicylate have shown excellent pulse height properties for alpha rays at room temperature in air. The films of fluorescent solutes used in the liquid scintillation counting have also shown excellent pulse height properties. The full widths at half maximum of the films for alpha ray spectrum are between 8 and 35% and of the same order of that of thin plastic scintillator used as a standard scintillator. The films of these materials are insensitive to high energy beta and gamma rays because of the too thin thickness of these films to detect these rays.