U-scope is of the first attempt to automatically determine the orientation of radioactive sources out in the fields. To locate the direction of gamma rays a rotating collimator of special form is used and, as seen in ordinary radars, intensity of radioactivity around observers is, as a function of azimuth angle separate from others, very quickly given on the screen of radar tube.
At the Second United Nations International Conference on the Peaceful Uses of Atomic Energy held at Geneva 1958, the author proposed a new prosepecting method by using car to quickly find out radioactive sources and showed many features of his new instrument by cinematographic record. Nobody had ever imagined it possible to succeed in such an attempt, in which radioactive sources can be so easily shown on cathode ray tube through electronic measurement and calculation.
Since then, many improvements, such as simplification of mechanical constructions and electronic circuits for cost reduction, magnetic recording of input gamma pulses on the tape to distinctly discover the weak sources deeply covered by soil and others, have been made in this instrument. Characteristics of U-scope have almost perfectly been solved these three years both in theorerical and practical aspects. Now, this paper covers all of these treatments.
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