Abstract
IN order to study the decay schemes of radio-isotopes, we have used two scintillation spectrometers in coincidence. The construction of the spectrometers used and the measuring technique have been described earlier1. The pulses from one of the spectrometers are analysed by a single-channel pulse analyser. Pulses corresponding to a certain energy-range are selected by the channel, and the output pulses from the analyser are fed to the sweep-trigger of an oscilloscope. The pulses from the second spectrometer are led to the vertical deflexion plates of the oscilloscope. Only pulses which are in coincidence with those selected by the pulse analyser then appear on the screen. The coincidence-rate is 10–100 pulses per minute. The screen is photographed for a few hours. A picture of the pulse–height distribution is then obtained on the photographic plate; the density at a particular point is a measure of the number of pulses with the corresponding height. The density is determined by means of a microphotometer, and, from the known density curve of the plate, one obtains the pulse–height distribution curve. With the pulse analyser one thus selects pulses corresponding to a certain beta- or gamma-ray energy, and from the shape of the coincidence spectrum obtained one can infer what gamma-rays are in coincidence with the selected radiation.
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ALMQVIST, S., JOHANSSON, S. Scintillation Spectrometer Studies on the Decay Schemes of Silver-110, Antimony-124 and Iodine-131. Nature 170, 583–584 (1952). https://doi.org/10.1038/170583b0
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DOI: https://doi.org/10.1038/170583b0