[en] The effects of 8 Gy ⁶⁰Co-irradiation, of AET (280 mg per kg) and of combined treatment on the catecholamine content of the brain, heart and adrenal glands were examined. Irradiation had no effect neither on the noradrenaline- nor on the dopamine content of the brain; the noradrenaline level of the heart decreased during the first 24 hours, followed by a significant increase. In the adrenal glands the adrenaline + noradrenaline content was not influenced, however, the dopamine level increased significantly. AET by itself decreased noradrenaline in the heart and increased dopamine in the adrenal glands. The combined therapy partially prevented the decrease of noradrenaline in the heart, but in other organs it did not influence the effect of irradiation. (L.E.)