Fluorescent Response of Cesium Iodide Crystals to Heavy Ions

Abstract

The light output from thallium-activated cesium iodide crystals has been determined using ${\mathrm{C}}^{12}$, ${\mathrm{N}}^{14}$, and ${\mathrm{O}}^{16}$ as incident particles, with energies up to 10 Mev per nucleon. A photocathode with $S-11\mathrm{}$ response viewed the scintillator light and the photomultiplier pulses were compared with those produced by alpha particles and protons of known energies. There is evidence that low-energy heavy ions are in-efficient producers of light in this spectral region.