2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 6: Rare Earths & Ionic Liquids
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 432 pages |
| ISBN: | 978-1-987820-08-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Precipitating deoxidization of CsI growth melt by cation dopants as a way to improve scintillation properties of the grown single crystals
Victor Cherginets1;1INSTITUTE FOR SCINTILLATION MATERIALS, NATIONAL ACADEMY OF SCIENCES OF UKRAINE, Kharkov, Ukraine;
Type of Paper: Regular
Id Paper: 161
Topic: 11
Abstract:
Present-day trends in material science of halide scintillators are connected with the improvement of their quality by the use of halide raw of high purity. The common way of purification consists in the treatment of the corresponding melts in reactive gas atmosphere containing free halogens or hydrogen halides that provide the removal of oxygen-containing products in the gaseous phase. However, the use of these methods is rather limited because of the high corrosion activity of the mentioned agents.
We report methods providing the precipitation of oxygen-containing admixtures as solid phase by cation dopants destructing oxide-containing anions and fixing the formed oxide ions.
The connection between physicochemical parameters of cation dopants (Be, Eu, Mg, Ni and Y) and their purification ability is considered an example of cesium iodide, which is widely used as a scintillator for high-energy physics.
The radioluminescence spectra and time profiles of the scintillation pulse of undoped and cation scavenged CsI single crystals are analyzed. The treatment of molten CsI by the dopants results in the suppression of afterglow that makes the material faster.
The efficiency of the studied cations depends, mainly, on the solubility of the formed oxide, which is the function of the melting point of the formed oxide. The density ratio of the formed oxide and the melt treated should be taken into consideration too, from the industrial use of the cation dopants perspective.
Mg and Y cations are the most effective for the purification since they form refractory oxides possessing extremely low solubility. Their use permits obtaining the materials with the fraction of the fastest components more than 80 %.