Universe (Oct 2021)

Detection of Low-Energy X-rays Using YSO Scintillation Crystal Arrays for GRB Experiments

  • Minbin Kim,
  • Jakub Ripa,
  • Il H. Park,
  • Vitaly Bogomolov,
  • Søren Brandt,
  • Carl Budtz-Jørgensen,
  • Alberto J. Castro-Tirado,
  • Sheng-Hsiung Chang,
  • Yenyun Chang,
  • Chia Ray Chen,
  • C.-W. Chen,
  • Pisin Chen,
  • Paul Connell,
  • Chris Eyles,
  • Georgii Gaikov,
  • Gihan Hong,
  • Jian Jung Huang,
  • Ming-Huey Alfred Huang,
  • Soomin Jeong,
  • Jieun Kim,
  • Jik Lee,
  • Heuijin Lim,
  • Chih-Yang Lin,
  • Tsung-Che Liu,
  • Jiwoo Nam,
  • Mikhail Panasyuk,
  • Vasily Petrov,
  • Victor Reglero,
  • Juana M. Rodrigo,
  • Sergey Svertilov,
  • Nikolay Vedenkin,
  • Ming Zu Wang,
  • Ivan Yashin

DOI
https://doi.org/10.3390/universe7110396
Journal volume & issue
Vol. 7, no. 11
p. 396

Abstract

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We developed an X-ray detector using 36 arrays, each consisting of a 64-pixellated yttrium oxyorthosilicate (YSO) scintillation crystal and a 64-channel multi-anode photomultiplier tube. The X-ray detector was designed to detect X-rays with energies lower than 10 keV, primarily with the aim of localizing gamma-ray bursts (GRBs). YSO crystals have no intrinsic background, which is advantageous for increasing low-energy sensitivity. The fabricated detector was integrated into UBAT, the payload of the Ultra-Fast Flash Observatory (UFFO)/Lomonosov for GRB observation. The UFFO was successfully operated in space in a low-Earth orbit. In this paper, we present the responses of the X-ray detector of the UBAT engineering model identical to the flight model, using 241Am and 55Fe radioactive sources and an Amptek X-ray tube. We found that the X-ray detector can measure energies lower than 5 keV. As such, we expect YSO crystals to be good candidates for the X-ray detector materials for future GRB missions.

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