Abstract:
There are four naturally occurring alpha decay series; amoung them Thorium and Uranium decay series occur in nuclear emulsion as the form of "alpha stars" emitted from a common point having five tracks and four tracks respectively. Nuclear emulsion is the photographic film with high spatial resolution. Tracks of particles can be seen using a microscope after the photographic development of nuclear emulsion film plate. In this paper, photographs of Thorium and Uranium decay series in various shapes are presented and their characteristics are discussed. This paper is intended for students who are studying nuclear physics to achieve the knowledge of alpha decay series by practically determining the alpha tracks in nuclear emulsion.
Key words: Thorium series, Uranium series, nuclear emulsion
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