Growth in the Chicken after High-Rate and Low-Rate Cobalt-60 Gamma Irradiation

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Abstract
The relative influence of dose and period of exposure on the growth of chicks that survived more than 30 days after single doses of Co60 [gamma] -rays was described statistically. Chicks, 3 to 4 days of age, were exposed to doses delivered in a few min. or protracted over 24 hrs. When growth to 170 days is fitted to the Gompertz function, the radiation effect can be quantitatively described by a linear relation between weight (arbitrarily chosen at 45 days) and dose. The rates of decrease in weight with dose are approximately the same in the high-rate and low-rate groups, but a loss in dose effectiveness equivalent to approximately 400 R results with protractions of 24 hrs. Between 170 and 800 days of age there is a slow but constant increase in weight which is approximately linear. This increase is eliminated by exposure to doses in the acute lethal range.

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