کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9845696 1526518 2005 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Further study on different dopings into PbWO4 single crystals to increase the scintillation light yield
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم ابزار دقیق
پیش نمایش صفحه اول مقاله
Further study on different dopings into PbWO4 single crystals to increase the scintillation light yield
چکیده انگلیسی
Since we presented our preliminary result (Nucl. Instr. and Meth. A 486 (2002) 170) at SCINT2001, we have continued our efforts to increase the light yield (LY) of PbWO4 scintillators by extending different dopings with an aim to find a possibility of using PbWO4 successfully in Positron Emission Tomography (PET). Overall result obtained for single doping as well as double and tripple co-dopings are summarized, including decay characteristics and radiation hardness. The LY in non-doped PbWO4 crystals with a size of 10×10×(20-30) mm3 is 25-35 photolectrons/MeV (phe/MeV) corresponding to 3-4% of the LY in BGO, when measured with a bialkali photomultiplier during a gate of ∼1 μs. The maximum LY increased to 49 phe/MeV for single doping with Mo6+, 80 phe/MeV for double co-doping of Mo6++Sb5+, and ∼85 phe/MeV for tripple co-doping of Mo6++Cd2++Sb5+. The radiation hardness is larger than 105 Gy for each of the samples co-doped with Mo6++Sb5+ and Mo6++Cd2++Sb5+, while it is much poorer in PWO:Mo6+. In each of these co-doped samples, a medium-speed green emission in the microsecond range is created besides the fundamental fast (∼a few nanoseconds range) blue one, giving a peak at ∼500 nm in the radioluminescence spectrum similarly as in PWO:Mo6+.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 540, Issues 2–3, 21 March 2005, Pages 381-394
نویسندگان
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