Evaluating Zn2SiO4:Mn phosphor for use in medical imaging radiation detectors |
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| Authors: | I. Kandarakis D. Cavouras P. Prassopoulos E. Kanellopoulos C.D. Nomicos G.S. Panayiotakis |
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| Affiliation: | (1) Dept. of Medical Instrumentation Technology, Technological Educational Institution of Athens, Ag. Spyridonos Street, Aigaleo, 122 10 Athens, Greece (Fax: +3-01/5910-975, E-mail: cavouras@hol.gr; cavouras@medisp.teiath.gr), GR;(2) Department of Radiology, University Hospital, Medical School, University of Crete, Heraklion, Greece, GR;(3) Dept. of Electronics, Technological Educational Institution of Athens, Ag. Spyridonos Street, Aigaleo, 122 10 Athens, Greece, GR;(4) Dept. of Medical Physics, Medical School, University of Patras, 265 00 Patras, Greece, GR |
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| Abstract: | 2 SiO4:Mn phosphor was evaluated for use in radiation detectors of medical imaging systems. Zn2SiO4:Mn was used in the form of laboratory-prepared fluorescent layers (screens) with coating weights from 18 to 150 mg/cm2. The phosphor was excited to luminescence by low-energy X-raysusing X-raytube voltages ranging from 15 to 50 kVp. The number of emitted optical photons per incident X-rayquantum was thus determined for various X-rayenergies and phosphor coating weights. The optical emission spectrum was also measured and it was used to evaluate the spectral compatibility of Zn2SiO4:Mn with radiographic films, photocathodes and the Si photodiode. Finally, phosphor optical properties were estimated by fitting a theoretical model to experimental data. Results showed that Zn2SiO4:Mn is more efficient for low-energy X-rays. Its intrinsic conversion efficiency was found equal to 0.08, which is comparable to that of actually used phosphors. Zn2SiO4:Mn was also adequately compatible with orthochromatic films and the ES-20 photocathode, thus being appropriate for low-voltage radiography and fluoroscopy. Received: 31 July 1998/Accepted: 3 August 1998 |
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| Keywords: | PACS: 78.65 42.80 |
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