Some immunological parameters were investigated in a group of workers exposed to external radiation (1.4 to 9.8 mSv) and inhalation of tritium (comm. eff. dose equiv. 1.2 to 2.8 mSv). The present investigations indicate the differential radiosensitivity of lymphocytic subsets: CD8 positive suppressor T cells were found to be the most sensitive subpopulation in the peripheral blood of radiation exposed workers. CD4/CD8 ratios were increased mainly due to an increase in absolute numbers of CD4 positive helper T cells indicating a selective cell renewal after irradiation. Results obtained after phytohaemugglutinin stimulation of lymphocytes showed individual variation, though there seems to be a trend towards an inverse correlation between absolute T cell numbers in peripheral blood and the number of S phases observed after stimulation, low T cell numbers leading to a high rate of stimulation. The calculation of the committed effective dose equivalents show that radiation protection against internal tritium contamination in power plants should not be neglected.
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