Curved crystal spectrometer for precise energy measurements of gamma rays from 30 to 1500 keV

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Abstract

A DuMond-type spectrometer with an interferometric angle measuring system is described. It has a focal length of 464 cm, a crystal window of 22 cm2, and uses the (110) plane of quartz. The interferometer yields an angular accuracy of about 0.01 seconds of arc. Therefore, the spectrometer permits extremely precise measurements of the relative energies of X- or γ-lines. Strong transitions can be recorded with a relative precision of (1–5) × 10−6, as is shown through the measurement of γ-lines from the decay of 198Au, 199Au, 182Ta, and 183Ta.

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