Strontium iodide
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IupacnameStrontium iodide

Strontium iodide is an inorganic compound with the chemical formula SrI2. It is a salt of strontium and iodine. It forms a hexahydrate SrI2*6H2O. It is an ionic, water-soluble, and deliquescent compound that can be used in medicine as a substitute for potassium iodide.[1] It is also used as a scintillation gamma radiation detector, typically doped with europium, due to its optical clarity, relatively high density, high effective atomic number (Z=48), and high scintillation light yield.[2] In recent years, europium-doped strontium iodide (SrI2:Eu(2+)) has emerged as a promising scintillation material for gamma-ray spectroscopy with extremely high light yield and proportional response, exceeding that of the widely used high performance commercial scintillator LaBr3:Ce(3+). Large diameter SrI2 crystals can be grown reliably using vertical Bridgman technique [3] and are being commercialized by several companies.[4][5]

Reactions

Strontium iodide can be prepared by reacting strontium carbonate with hydroiodic acid:

SrCO3 + 2 HI(aq) → SrI2 + H2O + CO2

Strontium iodide forms a white powder that slowly changes to a yellowish colour when exposed to air. At high temperatures (in the presence of air) strontium iodide completely decomposes to form strontium oxide and free iodine.[6]

References

  1. ^ Shoemaker, John V. (1908), "A Practical Treatise on Materia Medica and Therapeutics", 7th ed., Philadelphia: F. A. Davis, p. 854, retrieved 2007-12-10
  2. ^ Prettyman, Thomas; Burger, Arnold; Yamashita, Naoyuki; Lambert, James; Stassun, Keivan; Raymond, Carol (2015). "Ultra-bright scintillators for planetary gamma-ray spectroscopy". SPIE Newsroom. doi:10.1117/2.1201510.006162. ISSN 1818-2259
  3. ^ Datta, A.; Lam, S.; Swider, S.; Motakef, S. (October 2016). "Crystal growth of large diameter strontium iodide scintillators using in Situ stoichiometry monitoring". 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD). pp. 1–4. doi:10.1109/NSSMIC.2016.8116640. ISBN 978-1-5090-1642-6. S2CID 31775311
  4. ^ Inc., CapeSym. "CapeSym | SrI2(Eu)". www.capesym.com. Retrieved 2018-02-13.
  5. ^ "Strontium Iodide | RMD". rmdinc.com. Archived from the original on 2018-02-14. Retrieved 2018-02-13.
  6. ^ Bartley, Elias H. (1898), "Text-book of Medical and Pharmaceutical Chemistry", 5th ed., Philadelphia: P. Blakiston, pp. 267–268, retrieved 2007-12-10