| Popis: |
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 cm 2 , 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 198 Au, 199 Au, 182 Ta, and 183 Ta. |
