Response of CsI(Tl) to p, d, and α Particles

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Abstract
The relation of pulse height in CsI(Tl) to particle energy for protons, deuterons, and alpha particles has been examined below 20 Mev under a variety of experimental conditions. Observed deviations from simple proportionality (both constant and quadratic terms in a power series representation) depend upon circuit parameters. For a given apparatus, the deviations vary monotonically with the energy interval represented by one spectrometer channel, and tend to zero in the limit of vanishing channel width. The observations suggest that the intrinsic response of CsI(Tl) in the limit of vanishing instrumental effects deviates from a straight line through the origin by less than 0.1% per Mev. Observed curvatures, for channel widths of order 0.3–0.6 Mev, are in the range 0.1–1%/Mev for both protons and deuterons. Pulse‐height ratios for given energy are found to be d:p=1.04(+0.08, −0.02) and α:p=0.50(±0.03). Spectrometer peak positions are determined with a precision of 0.1 channel or better by a method of analytic interpolation.

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