[Biological effects in the partial irradiation of dogs with high-energy protons]

Biological effects of irradiation of the head, chest and stomach of dogs with 250 Mev protons at a dose of 600 rad were investigated. Due to irradiation all the animals developed radiation sickness of moderate severity. A comparative study of the peripheral blood and immunobiological reactivity of the dogs showed that an exposure of the head exerted the least effect; an exposure of the chest and stomach had a very similar effect.