X-Rays: Are There Cyclic Variations in Radiosensitivity?

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Science  04 Oct 1963:
Vol. 142, Issue 3588, pp. 53-56
DOI: 10.1126/science.142.3588.53


When adult CF1 mice of either sex were x-irradiated at various times of day and under various conditions of light and dark, their responses showed no cyclic variations. Radiodi-agnosis and radiotherapy may be practiced with equal safety at all times.