A single section accelerator tube built for 300 to 400 k.v. is used to accelerate a beam of deutrons obtained from a conventional arc discharge source. The beam impinges on a target of P2O5 + H22O producing neutrons according to the reaction H2+H2=H3+n. The target assembly is immersed in a tank of water which because of the elastic H1 and n collisions becomes a source of thermal neutrons. Detection is accomplished by placing a piece of silver in the tank. The silver becomes artificially beta radioactive by the well-known reactions Ag108+n→Ag109 and Ag109→Cd109+e-. Since the half-life of the beta activity is something over three · minutes there is ample time to remove the silver from the tank and detect the beta particles with a thin walled Geiger-Müller counter.
Proceedings of the Iowa Academy of Science
©1939 Iowa Academy of Science, Inc.
"A Deuterium - Deuterium Source of Neutrons,"
Proceedings of the Iowa Academy of Science, 46(1), 266-266.
Available at: https://scholarworks.uni.edu/pias/vol46/iss1/75