Abstract
Aqueous solutions of sodium thymonucleate have been irradiated with X- and γ-rays and the effects have been assessed by measuring the changes in the viscosity of the solutions. The relations of change produced to total dosage, to the presence of protective agents, to concentration of solution, and to dosage rate indicate that the radiations act through the mediation of activated water. The relation of change produced to the state of the nucleate before irradiation suggests that irradiation initiates, by chemical action, a process that may thereafter proceed spontaneously.