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Title: Study of the Kroll-process to produce ultra-pure Ti for the low background experiments

To construct G2 & G3 low background experiments for direct Dark Matter search, a lot of ultra-pure construction materials will be needed. Our study of various Ti samples shows that the levels of contaminations of commercially available industrial Ti can varies from 0.2 to 100 mBq/kg for U/Th. It means that the metal Ti is such a promising material for future experiments if the way of production in bulk quantities with very low level of contaminations (below ∼1 mBq/kg of {sup 238}U /{sup 232}Th) would be developed. Our study of the industrial Kroll-process is focused on the possible sources of U and Th and their migration during the multistage Kroll process. To understand migration of U and Th during the Kroll process the set of other impurities available due to precise ICP-MS analysis have been studied. Preliminary results confirm that the Kroll process could be used for the ultra pure Ti sponge production while the following stages of the metal Ti production of from the Ti sponge with necessary mechanical properties need to be additionally studied.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ; ;  [6] ;  [7] ;  [8]
  1. D. Mendeleyev University of Chemical Technology of Russia, Moscow 125047 (Russian Federation)
  2. Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow 119234 (Russian Federation)
  3. Solikamsk Magnesium Plant, Solikamsk,618541 (Russian Federation)
  4. ARMOLED Ltd, Moscow 125047 (Russian Federation)
  5. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, 142432 (Russian Federation)
  6. INFN Laboratori Nazionali del Gran Sasso, SS 17 bis km 18+910, 6010 Assergi (Italy)
  7. Physics and Astronomy Department, University of California, Los Angeles, Los Angeles, CA 90095, U.S.A (United States)
  8. (Russian Federation)
Publication Date:
OSTI Identifier:
22488703
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1672; Journal Issue: 1; Conference: LRT 2015: 5. international workshop in low radioactivity techniques, Seattle, WA (United States), 18-20 Mar 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 36 MATERIALS SCIENCE; BUILDING MATERIALS; CONTAMINATION; ICP MASS SPECTROSCOPY; IMPURITIES; KROLL PROCESS; MECHANICAL PROPERTIES; THORIUM 232; TITANIUM; URANIUM 238