DESIGN OF A GERMANIUM BENT-CRYSTAL DIFFRACTION MONOCHROMATOR & ITS APPLICATION IN NUCLEAR SPECTROSCOPY
A precision bent-crystal gamma-ray monochromator with stationary source has been built. The instrument consists of three independent units: the line source (a radioactive source or the anode of an x-ray tube), the 2-m-radius bent diffraction crystal with its pivot and sinemotion mechanism, and the heavy duty curved track framework which supports the collimator, detector, and shielding. The motions of the crystal pivot unit and of the detector carriage unit are linked together in such a way that the reflection condition is always satisfied. The precision of the monochromator for measurement of gamma-ray wavelengths is 0.003 X.U. The line width at half maximum, DELTA No measurable , observed when the (800) planes of a bent germanium crystal are used is 0.08 X.U. The resolution attained with the germanium crystal is illustrated by the unambiguous identification of the previously unobserved 245.237 kev gamma line, which was clearly resolved between the intense lines of 244.264 and 246.056 kev in the decay of W/sup 183/. Indicative experimental results obtained using the monochromator to observe nuclear resonance excitation in F/sup 19/ and Mn/sup 55/ are also given. (auth)
- Research Organization:
- California Inst. of Tech., Pasadena
- NSA Number:
- NSA-17-023624
- OSTI ID:
- 4714017
- Journal Information:
- J. Sci. Ind. Res. (India), Vol. Vol: 22; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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