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A clinical unit of radiation dosage (the rec or röntgen equivalent clinical) based on the röntgen under standard treatment conditions, is described. The relative biological effects of specific ion-density, over-all time, and field size are calculated so that equivalent dosage can be obtained under all treatment conditions. Absolute lethal tumour doses and tissue tolerances can be expressed in this unit and remain valid under all treatment conditions. One Kilorec is equivalent to 1 standard erythema dose under all treatment conditions.
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Lionel Cohen (1949) studied this question.
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