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A very sensitive LSC procedure to determine Ni-63 in environmental samples, steel and concrete

  • C. Scheuerer
  • R. Schupfner
  • H. Schüttelkopf
Advances in Instrumentation and Sofware for Radioanalytical Techniques

Abstract

This procedure to determine Ni-63 contributes to a safe and economically resonable decommissioning of nuclear power plants. Co-60, Fe-55 and Ni-63 are the most abundant long-lived radionuclides associated with contaminated piping, hardware and concrete for a period of several decades of years after shutdown, Samples are carefully ashed, leached, or dissolved by suitable mixtures of acids. The analysis starts with the absorption of Ni2+ on the chelating resin CHELEX 100. The next purification steps include an anionic exchange column and a precipitation as Ni-dimethyl-glyoxime, which is extracted into chloroform. After reextraction with sulfuric acid the solution containing Ni2+ is mixed with a scintillation cocktail and counted in an anticoincidence shielded LSC. The decontamination factors are determined for all important artificially and naturally occurring radionuclides ranging from above 104 to 109. The chemical yield adopts a value of (95±5)%. up to maximum sample amounts of 0,4 g steel, 5 g concrete and about 100 g of environmental samples the detection limits are about 5 mBq per sample or 12 mBq/g steel, 1 mBq/g concrete and 0,05 mBq/g environmental sample at a counting time of 1000 minutes.

Keywords

Chloroform Sulfuric Acid Radionuclide Power Plant Nuclear Power Plant 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Akadémiai Kiadó 1995

Authors and Affiliations

  • C. Scheuerer
    • 1
  • R. Schupfner
    • 1
  • H. Schüttelkopf
    • 2
  1. 1.Environmental Radioactivity Laboratory, Institut für Organische ChemieUniversity of RegensburgRegensburgGermany
  2. 2.Karlsruhe Nuclear Research CenterKarlsruheGermany

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