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An Electron Lens Type of Beta-Ray Spectrometer
Phys. Rev. 60, 32 – Published 1 July, 1941
DOI: https://doi.org/10.1103/PhysRev.60.32
Abstract
A beta-ray spectrometer utilizing the focusing action of the homogeneous magnetic field produced by a long solenoid is described. The theory of the action of an instrument of this type is considered in some detail for the case of a point source of beta-rays, and the extension of the theory to cover the case of an actual source of finite area is discussed. Details of design are given, together with a number of experimental tests which have been made on the instrument. These tests include measurements of the absorption of beta-rays in the Cellophane window of the G-M counter used for detection, measurement of the resolution and efficiency of the spectrometer, calibration of the instrument, and an examination of the beta-ray spectrum of radium E. The beta-spectra of phosphorus and iridium have been investigated. The forms of the distribution curves all agree better with the Fermi than the K-U theory. It is concluded that the spectrometer operates satisfactorily and possesses some definite advantages over the conventional designs.
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