Abstract
WITH the increasing use of γ-radiography for the inspection of metal castings, forgings, and welds, attention has both rightly directed to the necessity of providing adequate protection for personnel against excessive exposure to γ-radiation. This is somewhat more difficult to achieve with portable γ-ray sources man with permanent X-ray installations, and a need long been felt for a well-designed protective carrier and exposure unit for use with radium or radon. The announcement that Johnson Matthey and Co., Ltd., are manufacturing protective equipment for industrial radiography is therefore welcome. The basic unit is a portable carrier, constructed of copper tungsten alloy so as to provide adequate screenage for sources up to 250 millicuries. The beam may be directed accurately and safely with the aid of a periscopic device, and the unit is conveniently mounted on a mobile stand. For taking panoramic radiographs of a number of objects simultaneously, a time-controlled exposure unit is available. Although equipment of this kind cannot absolve the user from taking the routine precautions which are necessary for all radiation work, the Johnson Matthey units, which are clearly the result of considerable experience of industrial radiography, will certainly make his task easier ; with them there should be no difficulty in complying with accepted protection standards. They will assist the industrial radiologist to take advantage of the improved supplies of radium and radon which are now available (Nature, June 4, 1949, p. 867).
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Equipment for γ-Radiography. Nature 164, 431 (1949). https://doi.org/10.1038/164431d0
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DOI: https://doi.org/10.1038/164431d0