The Design and Construction of a Double-Focusing Beta-Ray Spectrometer

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Abstract
For the measurement of beta‐ and gamma‐ray energies one requires a magnetic spectrometer of high resolution and large solid angle. One of the simplest instruments satisfying these specifications is the double‐focusing beta‐ray spectrometer. The design and construction of such an instrument is described. This particular spectrometer has a mean radius of curvature for the electrons of 24.33 cm and preliminary measurements show that its resolution is about ⅓ percent and that about 0.2 percent of all the electrons of given energy which leave the source are focused on the counter. Construction of such an instrument proved to be very easy.

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