The dynamic variation of folate content in the whole blood from ?-irra-diated rats have been observed. The level of folate, which did not alter significantly 24 hours after whole-body exposure of 800 rads, decreased dramatically to about 50 percent at the 5th day and to about 67 percent at the 10th day. After irradiation the haemoglobin concentration in rats also decreased, but there was no coincidence between the dynamic variation of folate level and haemoglobin concentration. It is probable that ionizing radiation induces the folic acid malnutrition of rats.
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