Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 0 0 1972 12 15 37 46 H. IZADIAN 2015 09 28 1. The importance of the oxygen tension at the time of irradiation is well known (I ),(2); this is shown in radiation biology by increasing the oxygen tension, either generally in the whole body by 100% oxygen inhalation (5), or locally by hydrogen peroxide infusion (7), at the time of irradiation. 2. It is also well known that the reducing substances are protectors against ionizing radiation, In spite of the discovery of many reducing substances, found like radioprotectors, nobody had mentioned the reducing effect of" Hydrogen Molecule" which is the most reducing substance. 3. Since the body fluid is chemically like a physiological solution, if one applies an anode of a galvanic current to the malignant tissues (at the time of irradiation), and the cathode at another body point, it is possible to increase the oxygen tension in the malignant tissues, and the hydrogen tension in the rest of the body, and consequently to obtain two beneficial effects. To verify this idea a study of the combined effects of X-rays, and electrolysis has taken place on the embryon hematopoietic system of mice which has justified the hypothesis. https://acta.tums.ac.ir/index.php/acta/article/view/4152 https://acta.tums.ac.ir/index.php/acta/article/download/4152/4127