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22-Feb-2020 14:20

Other electronic controls include : high voltage spectrum stabiliser, negative ion generator to remove static charges on counting vials, pulse shape analysis (PSA) capabilities to allow differentiation between alpha and ß emitters, and RF pickup.Twin multichannel analysers (MCAs) record both coincident and anti-coincident events in both sets of tubes, with the data not only used for age calculation , but also for quality control purposes.

The counter components requiring optimisation are '...The result is that the smaller of the two time coincident pulses, if also smaller than the set coincidence bias, will not be accepted for pulse summation.The Quantulus, unlike most conventional counters, incorporates a two-position, coincidence bias threshold, allowing counting optimisation for either C. The PAC circuitry compares the amplitude of the pulses from each PMT and, if the pulse heights differ by more than a selected amount, the pulses are rejected as background events.To learn more or modify/prevent the use of cookies, see our Cookie Policy and Privacy Policy.

These difficulties are further compounded, by the influence of cosmic and environmental background radiation, other radioisotopes being present, electronic noise and instability, and other factors.Figure 1: Schematic diagram of Quantulus lead shield assembly and phototubes.