Abstract
Summary and Conclusion
1. Data showing qualitative and quantitative differences in the peripheral blood and bone jmarrow of the dog following administration of single or divided doses of 100 r total body irradiation presented. 2. The accepted pattern of leukocytic radiosensitivity (lymphocyic > granulocytic) is observed after admionistration of 100 r in one dose or in 2 doses of 50 r. 3. Administration of 10 or 25 r per dose shows a reversal of this sensitivity apparent in the occurrence of an increased number of granulocytes in the blood and bone marrow in the absence in band forms in the post-irradiation biopsy specimen indicates an increase in maturation in the bone marrow. 5. The sudy of the peripheral blood may be valuabel as an indicator of bone marrow activity when only small doses of x-ray are used.
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