Measurement of X-ray spectra using a Lu2(SiO4)O-multipixel-photon detector with changes in the pixel number

Appl Radiat Isot. 2015 Sep:103:25-30. doi: 10.1016/j.apradiso.2015.05.012. Epub 2015 May 21.

Abstract

To measure X-ray spectra with high count rates, we developed a detector consisting of a Lu2(SiO4)O [LSO] crystal with a decay time of 40 ns and a multipixel photon counter (MPPC). The photocurrents flowing through the MPPC are converted into voltages and amplified by a high-speed current-voltage amplifier, and event pulses from the amplifier are sent to a multichannel analyzer to measure spectra. We used three MPPCs of 100, 400 and 1600 pixels/mm(2), and the MPPCs were driven under pre-Geiger mode at a temperature of 20 °C. At a tube voltage of 100 kV and a tube current of 5.0 μA, the maximum count rate was 12.8 kilo-counts per second. The event-pulse widths were 200 ns, and the energy resolution was 53% at 59.5 keV using a 100-pixel MPPC.

Keywords: 200-ns-width event pulse; Energy resolution; High-speed amplifier; LSO-MPPC detector; Pre-Geiger mode; X-ray spectra.

Publication types

  • Comparative Study
  • Evaluation Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amplifiers, Electronic*
  • Equipment Design
  • Equipment Failure Analysis
  • Lutetium / radiation effects*
  • Photometry / instrumentation*
  • Photons
  • Radiation Dosage
  • Radiometry / instrumentation*
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Signal Processing, Computer-Assisted / instrumentation*
  • Silicon Dioxide / radiation effects
  • Transducers
  • X-Rays*

Substances

  • Lutetium
  • Silicon Dioxide