Improvements in Large Volume Coaxial Germanium Spectrometers
- 1 June 1966
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Nuclear Science
- Vol. 13 (3), 285-296
- https://doi.org/10.1109/tns.1966.4324111
Abstract
Large volume (16-54 cm3) germanium lithium drift diodes coaxially drifted with one open end have shown excellent performance as γ-ray spectrometers. However limitations have been found in the coincidence resolving times possible with short coaxial diodes due to large variations in charge collection times which result from the non-uniformity of the electric field - especially in the closed end portion. Leading edge time distributions as a function of axial position were made on a longer (6.6 cm) coaxial diode with one open end using 511 keV γ-rays. In an attempt to improve the electric field uniformity, the closed end was cut off to produce a double open-ended detector 4.2 cm long, and a single open ended detector 2.1 cm long. Both diodes were excellent spectrometers. In the 4.2 cm detector (C = 55 pF) the full width at tenth maximum W0.1 of the leading edge time distributions varied from 34 nsec to 19 nsec due to a large variation in core size along the axis. In the 2.1 cm detector (C = 34 pF) W0.1 varied from 17 nsec in the coaxial region to 30 nsec at the closed end. A 6.1 cm long coaxial diode was made with two open ends, a circular crosssection, and a circular core cross-section nearly uniform along the length. W0.1 of the leading edge time distribution for this improved diode was 19 nsec for the whole detector, and varied by less than 2 nsec from end to end.Keywords
This publication has 5 references indexed in Scilit:
- A preamplifier with 0.7 keV resolution for semiconductor radiation detectorsNuclear Instruments and Methods, 1965
- A germanium lithium-drift diode with guard-ring for γ-ray spectroscopyNuclear Instruments and Methods, 1965
- A LARGE-VOLUME, COAXIAL, LITHIUM-DRIFT, GERMANIUM GAMMA-RAY SPECTROMETERCanadian Journal of Physics, 1965
- HIGH-RESOLUTION STUDIES OF GAMMA-RAY SPECTRA USING LITHIUM-DRIFT GERMANIUM GAMMA-RAY SPECTROMETERSCanadian Journal of Physics, 1964
- Mobility of Holes and Electrons in High Electric FieldsPhysical Review B, 1953