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Proceedings Paper

Detectors for multi-energy radiography
Author(s): Volodimer D. Ryzhikov; Dmitro Kozin; Olena Lysetskaya; Sergey Kostyukevich
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Paper Abstract

For multi-energy digital radiography, a sandwich structure is proposed, comprising "scintillator-photodiode" (S-PD) type detectors. This will allow obtaining information on an object simultaneously for two or three energies in the 20-400 keV X-ray range. Criteria have been formulated and a procedure proposed that determine requirements to detector characteristics for distinction of specified substances. Under this procedure, the following characteristics have been determined for two- and three-energy detecting systems. For a two-energy detector system used for organic substances (Zeff=6-8) and iron/steel (Zeff=26), the X-ray tube anode voltage VA=140 kV, sensitivity range of the low-energy detector (LED) and the high-energy detector (HED) 40-60 keV and 100-140 keV, respectively. The average detector sensitivity of LED should be closer to 40 keV, and that of HED - to 140 keV. There is a limitation that is imposed upon the detector sensitivity by sensitivity of the radiographic system. For such variant, LED are made on the basis of a photodiode and a ZnSe(Te) scintillator, ensuring good sensitivity in this range and transparence in the HED range. HED can be made on the S-PD base using CsI(Tl), CdWO4 or Cd2O2S. In a three-energy system, where elements with Zeff=6,7 and 8 should also be determined detector sensitivity ranges should be as follows: LED - 10-35 keV, medium-range energy detector (MED) - 40-80 keV, HED - 100-140 keV. Such subdivision into ranges is ensured by the use of a semiconductor sensor (e.g., silicon) as LED, S-PD with ZnSe(Te) as MED, and CsI(Tl), CdWO4 or Cd2O2S - as HED.

Paper Details

Date Published: 20 January 2004
PDF: 7 pages
Proc. SPIE 5198, Hard X-Ray and Gamma-Ray Detector Physics V, (20 January 2004); doi: 10.1117/12.504031
Show Author Affiliations
Volodimer D. Ryzhikov, Institute for Single Crystals (Ukraine)
Dmitro Kozin, Institute for Single Crystals (Ukraine)
Olena Lysetskaya, Institute for Single Crystals (Ukraine)
Sergey Kostyukevich, Institute for Single Crystals (Ukraine)


Published in SPIE Proceedings Vol. 5198:
Hard X-Ray and Gamma-Ray Detector Physics V
Larry A. Franks; Arnold Burger; Ralph B. James; Paul L. Hink, Editor(s)

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