Dosimetric properties of high energy current (HEC) detector in keV x-ray beams
Department of Radiology
Biological and Chemical Physics | Medical Biophysics | Radiology
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.
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Citation: Phys Med Biol. 2015 Apr 7;60(7):N121-9. 2015 Mar 19. Link to article on publisher's site
Zygmanski, Piotr; Shrestha, Suman; Elshahat, Bassem; Karellas, Andrew; and Sajo, Erno, "Dosimetric properties of high energy current (HEC) detector in keV x-ray beams" (2015). Radiology Publications and Presentations. 243.