Sector Type Double Focusing Beta Ray Spectrometer Part I General properties

Abstract

A small scale beta ray spectrometer was built, making use of the double focusing principle applied to sector-field. The fringing field was found to be easily corrected and not to be serious for conventional purposes. The gathering power of 0.3% was obtained for the resolving power of 0.7%. Since the source can be placed outside of the magnetic field, this type of spectrometer might serve as a powerful tool for coincidence and correlation measurements.