GaAs X-ray coordinate detectors

Citation
Gi. Ayzenshtat et al., GaAs X-ray coordinate detectors, NUCL INST A, 466(1), 2001, pp. 162-167
Citations number
3
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
0168-9002 → ACNP
Volume
466
Issue
1
Year of publication
2001
Pages
162 - 167
Database
ISI
SICI code
0168-9002(20010621)466:1<162:GXCD>2.0.ZU;2-B
Abstract
GaAs coordinate detectors for X-ray systems of scanning type have been deve loped. Two modifications of the detectors have been constructed for ionizin g radiation detection in parallel and perpendicular to the electric field d irection in the detector bulk. The detectors have 64 active regions with 10 0 mum pitch. In order to reach the minimum value of coupling capacitance an d resistance coupling between active regions, the latter is separated by na rrow gaps on unit cells. The gaps are made by means of reactive ion etching . The detectors are fabricated on the base of vapor-phase epitaxial materia l 40-45 mum in thickness with free carriers concentration of p(0) = 10(12) cm(-3). Input capacitance of a detector cell is 0.25 pF, dark current is 30 -50 pA per cell. The detectors have almost 100% charge collection efficienc y for all types of ionizing radiation. High resolution of the detector allo ws to detect structures of a spectrum from the Am-241 source in the energy range of 14-17 keV. (C) 2001 Published by Elsevier Science B.V.