Radiation hardness studies of CdTe and Hgl2 for the SIXS particle detector on-board the BepiColombo spacecraft

Research output: Contribution to journalArticleScientificpeer-review


  • J. Ahoranta
  • J. Huovelin
  • Minttu Uunila
  • H. Andersson
  • R. Vainio
  • A. Virtanen
  • H. Kettunen

Research units


We report of the radiation hardness measurements that were performed in the developing work of a particle detector on-board ESA's forthcoming BepiColombo spacecraft. Two different high-Z semiconductor compounds, cadmium telluride (CdTe) and mercuric iodide (HgI2), were irradiated with 22 MeV protons in four steps to attain the estimated total dose of 1012 p / cm2 for the mission time. The performance of the detectors was studied before and after every irradiation with radioactive 55Fe source Mn Kα 5.9 keV emission line. We studied the impact of the proton beam exposure on detector leakage current, energy resolution and charge collection efficiency (CCE). Also the reconstructive effect of annealing on radiation induced damage was tested for CdTe detector.


Original languageEnglish
Pages (from-to)344-349
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number3
Publication statusPublished - 2009
MoE publication typeA1 Journal article-refereed

    Research areas

  • BepiColombo, CdTe, Charge collection efficiency, Energy resolution, HgI2, Leakage current

ID: 3399742