Abstract
A change in the rubidium chloride Rb 86 red blood cell kinetics may reflect the effect of low levels of radiation upon the bone marrow. In workers in radiology who received x-ray exposure considered to be of acceptable levels, the uptake of 86Rb by the erythrocytes was greater than in those receiving no measurable occupational exposure. Uptake was greatest at multiples of two to three times natural background and was greater in those persons with fewer than ten years of occupational exposure.