โ Scribed by L.T. Tsankov; M.G. Mitev; Ch.B. Lenev
No coin nor oath required. For personal study only.
An LC circuit used as anode load of a photomultiplier tube converts its output current pulse into a damped harmonically oscillating voltage. Its amplitude is not only proportional to the transferred charge but it can be also readily encoded by the count of the successive maxima it passes until it falls below a predefined voltage level. Thus, a scintillation spectrometer may be realised in a very simple way, bypassing the classical (but rather sophisticated) solutions based on pulse-shaping amplifiers and amplitude-to-digital converters. The structure, spectral response and some experiments with a 256-channel 'LC spectrometer' are discussed. A 7% energy resolution has been achieved at 662 keV (with a +45 ร 40 mm NaI(Tl) crystal). Despite some uncommon features (arising from the logarithmic channel-energy dependence), this spectrometer has useful potential in at least two fields of scintillation gammaspectroscopy-as a portable dose-rate meter or in the study of the soft component of the cosmic rays.
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