Irradiation with x-rays produces no chemical change in air-free water. With oxygen present, hydrogen peroxide is formed due to a primary activation of the water. The initial production of hydrogen peroxide is independent of the oxygen pressure, from 4 to 70 cm Hg and is dependent on the hydrogen ion concentration according to: H2O21000r×1000 cc=[2.2+2.2[109.6−pH1+109.6−pH]10−6N.
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Hugo Fricke (1934) studied this question.
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