Bridgman Growth of SrI 2
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of SrI2 Leonard Alaribe, Christian Disch, Alex Fauler, Ralf Engels, Egbert Keller, Angelica Cecilia, Tomy dos Santos Rolo and Michael Fiederle MRS Proceedings / Volume 1341 / 2011 DOI: 10.1557/opl.2011.1275
Link to this article: http://journals.cambridge.org/abstract_S1946427411012759 How to cite this article: Leonard Alaribe, Christian Disch, Alex Fauler, Ralf Engels, Egbert Keller, Angelica Cecilia, Tomy dos Santos Rolo and Michael Fiederle (2011). Bridgman Growth of SrI2. MRS Proceedings,1341, mrss111341u0716 doi:10.1557/opl.2011.1275 Request Permissions : Click here
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Mater. Res. Soc. Symp. Proc. Vol. 1341 © 2011 Materials Research Society DOI: 10.1557/opl.2011.1275
Bridgman Growth of SrI2 Leonard Alaribe1, Christian Disch1, Alex Fauler1, Ralf Engels2, Egbert Keller3, Angelica Cecilia4, Tomy dos Santos Rolo4, Michael Fiederle1 1 FMF-Freiburger Materialforschungszentrum, Stefan-Meier-Straße 21, D-79104 Freiburg 2 Forschungszentrum Jülich, Wilhelm-Johnen-Straße, 52428 Jülich 3 Kristallographisches Institut, Hermann-Herder-Str. 5, D-79104 Freiburg 4 Institut für Synchrotronstrahlung-ANKA, Forschungszentrum Karlsruhe ABSTRACT Eu2+– activated strontium iodide is a promising material for x-ray and gamma ray detector. A lot of difficulties are though encountered growing strontium iodide crystals due to the high oxygen-sensitivity, hygroscopic property and high impurity concentration. Single crystals of SrI2:Eu were grown from zone refined starting materials in silica ampoules. The crystals showed good optical qualities. The light yield of two samples cut from the same ingot was determined to be 53 000 photons/MeV and 119±22 photons/keV for a 0.4 cm3 sample and a 360 μm sample respectively, indicating some level of light trapping in the bulk sample. Keywords: scintillator, Bridgman growth method, energy resolution. INTRODUCTION The role of scintillators is fast expanding in many sectors of industrial measuring systems, fundamental research and medical imaging, where a high resolution measurement of the spatial distribution of radiation intensity in tissues is very necessary. Another important application of scintillators is in homeland security, nuclear nonproliferation and national defense as radiation detectors. Here a system is required to identify radioactive sources and their gamma ray signature. The identification of the isotope giving rise to a radiation is important to obtain information about the radiation type and radiation energy. Required for these applications is a scintillator with a relative high light yield, a good energy resolution, a fast scintillation decay time and a high density and high effective atomic number for a high gamma energy photoelectric absorption (ןȡZeff3-4). In this paper we report on the zone refinement, growth of SrI2 single crystals with different Eu2+ concentrations, preparation and performance of a 6% Eu2+ doped SrI2 in 0.4 cm3 and 360 μm samples.
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ZONE REFINING AND CRYSTAL G
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