Abstract
A portable detection apparatus is described which makes it possible to undertake radioisotope experiments where transient changes in count rate must be observed even in difficult environmental conditions. In addition to conventional scaler, ratemeter and chart recorder facilities the apparatus includes a commercially available stereo tape recorder. The output pulses from either one or two scintillation detectors are recorded on one stereo track and time pulses from a crystal oscillator are recorded on the other. The data are read out at the laboratory into a multi-channel analyser operated in multiscaler mode using the time pulses to actuate the address advance. This system accurately reproduces the count rate as a function of time in the original data. The operating performance of the system is discussed and illustrated by means of results obtained from radioisotope tracer studies of sand movement on the sea floor near harbour installations.
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