Download or read book Portable Alpha-activity Measuring Instrument written by C. S. Wu and published by . This book was released on 1948 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: A portable sensitive alpha-particle detector has been developed for scanning and surveying small amounts of U-metal on various surfaces. Although there are various possible ways of detecting alpha particles, for the sake of simplicity and serviceability, the method using an ionization chamber in connection with a portable electrometer circuit is employed. Units built in this laboratory have proven very satisfactory. The high sensitivity that has been achieved with these instruments approximates counter sensitivities.