Abstract
A transistor amplifier designed mainly for precise scintillation counter spectroscopy is described. Techniques such as double-delay-line pulse shaping and considerable negative feedback result in excellent linearity, gain stability and overload behaviour at high counting rates. An input charge of 2 X 10−13 Coulombs develops a ± 4V output pulse into a 100 Ω matched cable which feeds the Chalk River kicksorter. With l μsec pulse shaping lines the input equivalent R.M.S. noise is 4000 ion-pairs. Lower noise may be achieved by using shorter lines. The amplifier rise-time is 0.2 μsec (10 to 90 %). Use of plug-in printed circuit boards increases the versatility of the amplifier and simplifies the adjustment procedures.
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