The Effect of Excessive Radiation with Ultra-violet Light upon the Growth of Rats

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Abstract
Leigh-Clare confirmed previous observations in which ultra-violet radiation exercised a deleterious effect upon the health of experimental rats but the effect was found to be due to the conjunctivitis from which the animals suffered. Provided that the eyes were shielded, exposure of young growing rats to ultra-violet radiation for periods up to 30 min. daily had no deleterious effect on the growth and well-being of the rats (although this dose was 15 times the adequate dose for [male] rats). Exposure for 30 min. to the lamp had no more beneficial results than exposure for the shorter periods. When using the biological method for determination of vitamin A content of milk, it is preferable to provide vitamin D by including an irradiated vitamin-free fat in the diet rather than by direct irradiation of the rat.

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