An attempt has been made to reduce leakage and troublesome current fluctuations in ionization chambers due to α-particle emission from materials of which chambers are made. Work of Bearden (Johns Hopkins), 1932, has been checked in good agreement, with one exception. Counts of α-particle emission have been made for steel, electroplated copper, aluminum, tin, brass, and glass, after Bearden, and in addition for platinum, molybdenum, electroplated nickel, and electroplated chromium. Best results were obtained from cold rolled steel. In all cases the materials were cleaned with abrasives, and CH3Br was used as ionizing gas. A "cage" type ionization chamber, designed to reduce α-particle effects, was studied, and quantitative comparisons with ordinary cylindrical chamber were made. Measurements were made by photographically recording α-particle currents in an ionization chamber, amplified by FP54 vacuum tube system.
Proceedings of the Iowa Academy of Science
©1935 Iowa Academy of Science, Inc.
Sayler, J. Norvel
"X-Ray Ionization Chamber Materials,"
Proceedings of the Iowa Academy of Science, 42(1), 155-156.
Available at: https://scholarworks.uni.edu/pias/vol42/iss1/69