Hypercryogenic Detector-Fet Unit--Core of High-Resolution Spectrometer
- 1 June 1968
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Nuclear Science
- Vol. 15 (3) , 477-485
- https://doi.org/10.1109/tns.1968.4324972
Abstract
A hypercryogenic high-resolution x-ray and x-ray spectrometer is described. The spectrometer consists of a lithium-drifted germanium detector and a germanium-junction field-effect transistor (JFET) preamplifier. The detector is operated at its optimum temperature, which is in the range of 10-30° K. The JFET's are operated at liquid helium temperature. This results in 0.28 keV FWHM preamplifier resolution with a slope of 0.018 keV/pF. Resolutions of the order of 0.4 keV are obtained with low capacitance detectors for low-energy x rays. The x rays of 57Co are measured with 0.68 keV FWHM. The described spectrometer was used to study some aspects of the trapping effects in germanium detectors.Keywords
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