The percentage of lymphocytes with chromosomal aberrations in the peripheral blood of patients with cervical cancer increased to reach a peak 6 hr after a single${}^{60}{\rm Co}\ \gamma \text{-irradiation}$ of the pelvis, then decreased during the next 14 hours to the number recorded 20 min after irradiation. These findings may have important implications for the study of lymphocyte kinetics and for biological dosimetry.

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