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Photodiodes as detectors with high dynamical range for X-ray reflectivity measurements

Authors
Journal
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
0168-9002
Publisher
Elsevier
Publication Date
Volume
306
Issue
3
Identifiers
DOI: 10.1016/0168-9002(91)90050-z
Disciplines
  • Computer Science
  • Mathematics
  • Physics

Abstract

Abstract Silicon pin photodiodes from different manufacturers were tested with synchrotron radiation and found to be excellently suited as detectors for the X-ray range between 5 and 25 keV. They have a high dynamical range (more than 6 decades) and a high degree of linearity. They can be used in the current mode down to 100 photons/s. This corresponds to a photocurrent of 50 fA. The performance of the signal processing (current-voltage amplifier, voltage-frequency converter, frequency counter) is of great importance. The Keithley current-voltage amplifier 18000-20, whose range can be switched electronically, is superior in performance to the Keithley amplifier 427, when the intensity range exceeds 4 decades.

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