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Method of forming rare earth oxide ceramic scintillator with ammonium dispersion of oxalate precipitates

  • US 5,116,560 A
  • Filed: 03/22/1991
  • Issued: 05/26/1992
  • Est. Priority Date: 03/22/1991
  • Status: Expired due to Fees
First Claim
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1. A method of forming a polycrystalline rare earth oxide ceramic scintillator containing an oxide of a rare earth activator selected from the group consisting of europium, neodymium, ytterbium, dysprosium, terbium and praseodymium, having improved transparency that does not require milling, said scintillator being formed by dissolving a mixture of oxides of the scintillator composition in an aqueous hydrochloric or nitric acid solution to form a rare earth solution, precipitating oxalates from the rare earth solution, calcining the oxalates to form oxides, cold pressing the oxides to form a compact, and sintering the compact in a reducing atmosphere or vacuum to form the scintillator, the improvement comprising:

  • precipitating the oxalates by admixing the rare earth solution with an oxalic solution comprised of, oxalic acid and ammonium ions in an amount that disperses the oxalate precipitates.

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