The pulse height per unit energy has been measured for two pure sodium iodide crystals for gamma-ray excitation in the energy region 30 keV to 1 MeV, at temperatures between 77 K and 200 K. By using a specially calibrated crystal, it has been possible to find the light output per unit energy in terms of photons per MeV. The purity of the crystals used has been investigated by recording their emission spectra, and the variation of scintillation efficiency with specific ionization of the incident radiation has been deduced from the gamma-ray response data.
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West et al. (1970) studied this question.
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