Abstract

Scattering of the radiation emitted in a radioactive decay at the constructional components of a magnetic spectrometer will give rise to a background which usually is not eliminated by coincidence techniques. The background spectrum depends upon the features of the decay under investigation, the instrumental settings and the design parameters of the spectrometer. We investigated origin and intensity of various types of background signals observed in a magnetic lens spectrometer. Quantitative representative results are given which can provide an order of magnitude estimate for the background intensity to be expected in a certain decay. Significant background intensities are caused by γ-radiation as well as by electrons emitted in the decay. It was found that scattered conversion electrons can give rise to sharp structures in the apparent electron spectrum, which are comparable to or even narrower than the instrumental resolution. It is shown by which counter measures the various types of backgrounds can be minimized.

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