[The recovery of humoral immunity after the long-term action of tritium oxide at different irradiation levels]. / Vosstanovlenie gumoral'nogo immuniteta posle dlitel'nogo deistviia okisi tritiia pri raznykh urovniakh oblucheniia.

Dynamics of recovery of humoral immunity of CBA mice was studied 1, 3, 6 and 12 months after termination of long-term exposure to tritium oxide at various levels of absorbed doses (3, 5 and 9 Gy) and dose rates (3.3, 4.9 and 9.2 cGy.day-1). A severer and more stable residual radiation damage was observed in the department of lymphocyte precursors. A considerable decrease in the content of antibody producers was due to the lymphoid tissue hypoplasia. There was a direct relationship between the immunodeficiency and dose rate and total absorbed dose of beta radiation.

[The cytotoxic activity of natural killer cells exposed to the joint and separate actions on the body of 239Pu, hexachlorobutadiene and tributyl phosphate]. / Tsitotoksicheskaia aktivnost' natural'nykh killerov pri sovmestom i razdel'nom deistvii na organizm 239Pu, geksakhlorbutadiena i tributilfosfata.

Wistar rats were subjected to a single exposure to 239Pu nitrate through inhalation with the subsequent procedure of imitation of inhalation or without it (the amount of 239Pu deposited in the lungs in 24 hr was 8.9 +/- 1.9 kBq/lung) and inhalation of hexachlorobutadiene and tributyl phosphate within one month in a combination with the radionuclide or without it. There was a 1.5-fold increase, above additive, in the harmful effect of 239Pu and chemical agents on the function of natural killers as observed 15--30 days after the combined exposure as compared to individual inhalation. On days 120 to 240 cell cytotoxic activity in rats of all groups was normalized to reach or to exceed the intact control.

[The effective and ineffective levels of the joint action of 239Pu and gamma radiation according to the change in the ECG indices of dogs]. / Effektivnye i neéffektivnye urovni sovmestnogo vozdeistviia 239Pu i gamma-izlucheniia po izmeneniiu nekotorykh pokazatelei EKG u sobak.

Effective and ineffective levels of the isolated and combined action of inhaled 239Pu and external gamma radiation on dogs were estimated by some changes in the ECG. Specific share of each factor in the combined effect and the quality coefficient of 239Pu were estimated by two criteria of changes in the ECG. The data were extrapolated to man by the most reliable criterion, that is, the decrease in the ECG voltage indicated by the sum of R I, II, III waves.