A Large  -Spectrometer with Two-Directional Focusing for Precise Measurements of Nuclear Radiation

Abstract

In the present paper a large double focusing spectrometer is described, which is convenient for precise measurements of β- and γ-radiation. The magnetic field form is discussed and also the arrangement to measure the value of the field continuously with an accuracy appropriate to investigations of this kind. The difficulties due to electron straggling in the β-source or converter are emphasized, and this effect is for the moment the factor which prevents the full utilization of the high resolving power of the apparatus. A number of typical spectra are given to illustrate the applicability of the instrument to different cases.