Determination of low level alpha and beta emitters using liquid-liquid extraction and a liquid scintillation spectrometer

• Yu-Fu Yu ^[1] ; H.E. Bjornstad ^[1] ; B. Salbu ^[1]
  1. [1] Isotope and Electron Microscopy Laboratories, Agricultural University of Norway
• Localización: Low-level measurements of man-made radionuclides in the environment: proceedings of the Second International Summer School : La Rábida, Huelva, Spain, 25 June to 6 July 1990 / coord. por Manuel García León, Gonzalo Madurga Lacalle, 1991, ISBN 981-02-0397-7, págs. 176-186
• Idioma: inglés
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• Resumen

  • Two radiochemical procedures for determination of low level strontium-90 and plutonium-239+240 in environmental and biological materials using combined selective solvent extraction with low level liquid scintillation counting have been presented. Y-90, the daughter nuclide of Sr-90, and Pu-239+240 are selectively extracted from nitric acid solution into 5% di(-2ethylhexyl)phosphoric acid (HDEHP) in toluene and the radionuclides of interest in organic phase are counted with an ultra low level scintillation counter “Quantulus”.The lower detection limits for Sr-90 and Pu-239+240 are estimated to be 20 mBq and 0.3 mBq respectively. The developed procedures have been tested for soma environmental and biological samples and the preminarly results show that they are more simple and time-saving than traditional methods.