Abstract
Investigation on the photomultiplier (PM) 9635QB from Thorn EMI connected to a preamplifier revealed that it itself serves as an independent detector for external beta activity of which the performance has not been investigated by others since its introduction half a century ago. The definition of absolute efficiency when applied to the PM exhibited an overall efficiency of 24% in the detection of 90Sr+ 90Y which is mostly due to hard betas from 90Y ( E βmax = 2.27 MeV). Half of the counts observed by a scintillation detector (PM + PS) due to 90Sr + 90Y comprised of the same PM and a 0.4 mm thin NE102A plastic scintillator (PS) are by the PM alone. The performance of the PM, represented as a percentage of that of the scintillation probe (PM + PS) in the detection of various beta emitters, showed a linear increase with E βmax . Furthermore, in the overall count rate due to the scintillation probe (PM + PS) the individual contributions have been experimentally determined due to the scintillators used in making the NE102A and the PM.
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