Dosimetric properties of high energy current (HEC) detector in keV x-ray beams

Piotr Zygmanski, Suman Shrestha, Bassem Elshahat, Andrew Karellas, Erno Sajo

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

We introduce a new x-ray radiation detector. The detector employs high-energy current (HEC) formed by secondary electrons consisting predominantly of photoelectrons and Auger electrons, to directly convert x-ray energy to detector signal without externally applied power and without amplification. The HEC detector is a multilayer structure composed of thin conducting layers separated by dielectric layers with an overall thickness of less than a millimeter. It can be cut to any size and shape, formed into curvilinear surfaces, and thus can be designed for a variety of QA applications. We present basic dosimetric properties of the detector as function of x-ray energy, depth in the medium, area and aspect ratio of the detector, as well as other parameters. The prototype detectors show similar dosimetric properties to those of a thimble ionization chamber, which operates at high voltage. The initial results obtained for kilovoltage x-rays merit further research and development towards specific medical applications.

Original languageEnglish (US)
Pages (from-to)N121-N129
JournalPhysics in medicine and biology
Volume60
Issue number7
DOIs
StatePublished - Apr 7 2015
Externally publishedYes

Keywords

  • Auger electrons
  • quality assurance
  • radiation detectors
  • x-ray imaging
  • x-rays

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging

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