Deconvolution of liquid scintillation alpha spectra of mixtures of uranium and radium isotopes (Journal article)

Stamoulis, K. C./ Ioannides, K. G./ Karamanis, D.

A method for the determination of uranium and radium isotopes in water samples is proposed. Liquid scintillation techniques were used for collecting alpha spectra, which were then analyzed by fitting the alpha peaks with overlapping Gaussians. The analysis can quantify the observed isotopes with accuracy depending on the activity of each isotope. In order to simulate the peaks with Gaussian normal distribution functions, the centroid of each peak as well as the full width at half maximum (FWHM) are required, as they depend on the quenching of the sample. For this purpose, samples with known activities of (226)Ra and its decay products and also of the uranium isotopes (238)U and (234)U, at various quenching levels, were used to establish the correlation of the peaks' shift with the quench effect. In addition, the correlation of the FWHM with the centroid of a peak was determined, using the same procedure. Following the above analysis technique, an average of 97 +/- 2% of detection efficiency and a lower limit of detection of 8.2 mBq kg(-1) for alpha isotopes were achieved. (C) 2009 Elsevier B.V. All rights reserved.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών
Keywords: (238)u,(234)u,(226)ra,alpha/beta discrimination,liquid scintillation counting,spectrum unfolding,deconvolution,radioactivity,water,bottled mineral waters,environmental-samples,natural radionuclides,drinking-water,thin-films,ra-226,spectrometry,radioactivity,thorium,food
ISSN: 0003-2670
Link: <Go to ISI>://000273625900003
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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