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An account is given of investigations into the dosage distribution over an average child's head in the treatment of ringworm by X rays, using a five-field technique. Fair agreement is obtained between experimental and theoretical results, and they indicate that the dose given to some areas of the scalp is about twice that given to other areas. Isodose curves representing the experimental results are drawn on the model head, and have been photographed; a line reproduction of this picture is given. A means whereby such wide variations of dosage might be reduced is suggested.
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Osborn et al. (1945) studied this question.
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