. Cellular basis and aetiology of late somatic effects of ionization radiation. Radiation -- Physiological effect. EFFECTS OF LOW X-EAY DOSES 21 and in the controls (Table II) and similarly in the last series of Table I for the rats receiving 1 r and the controls. We think that this decreased mortality may be explained by a more progressive feeding of the rats by purina chow during their growth. Not only the percentage of mortality at the 30th day after 500 r but also the incidence of mortality after 500 r is the same in the conditioned animals and in the controls. Indeed the mortality curves
. Cellular basis and aetiology of late somatic effects of ionization radiation. Radiation -- Physiological effect. EFFECTS OF LOW X-EAY DOSES 21 and in the controls (Table II) and similarly in the last series of Table I for the rats receiving 1 r and the controls. We think that this decreased mortality may be explained by a more progressive feeding of the rats by purina chow during their growth. Not only the percentage of mortality at the 30th day after 500 r but also the incidence of mortality after 500 r is the same in the conditioned animals and in the controls. Indeed the mortality curves (which are not presented here) are 20rats C 7days C I4days C2ldoys C 28days C42days C56days Fig. 1. These results are not suggestive of any kind of radioresistance in our rats previously irradiated with low doses. We already know (Maisin, 1961) that higher doses of 5, 10, 50 or 400 r administered between 7 and 42 days before do not induce radioresistance in our rats however large the X-ray dose: LDjQ(30), LDgojgo) I^I^90(30)- Can it be reasoned from these residts that rats react differently from mice against conditioning or prior irradiation? It is perhaps very dangerous to think so. We are more inclined to believe that the differences obtained by certain authors are due to the fact that the uncon- ditioned animals were not always subjected to the experiments on the same day as the conditioned ones (Betz, 1950; Paterson et al., 1952), or that some authors came to too rapid a conclusion from their data (cf. Dacquisto (1959), in whose best experiment the xl is < 0-2). In view of these results, it was interesting to investigate the cellular behaviour of the marrow. We chose the marrow because all our animals. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harris, R. J. C. (Robert John Cecil), 1922
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