The study of natural and artificial radionuclides incorporation in teeth and head bones of animals lived nearby Caetité uranium mine, Brazil

Publication date: October 2016
Source:Journal of Environmental Radioactivity, Volumes 162–163
Author(s): A. Walencik-Łata, B. Kozłowska, J.W. Mietelski, K. Szufa, F.D. Freire, S.O. Souza
This study aimed at assessing the incorporation of radionuclides in animals in the proximity of the uranium mine in Caetité, Brazil. In 2014, samples of bovine and equine teeth and skull bones were collected and their contents of natural and artificial isotopes were assessed using nuclear spectrometry techniques. Gamma ray emission from ^226,228Ra and ⁴⁰K isotopes was determined using high-purity germanium (HPGe) spectrometry, ⁹⁰Sr radioactivity was measured with liquid scintillation, and ^234,238U, ^232,230,228Th, ²¹⁰Po and ^239+240Pu radioactivity was assessed with alpha-spectrometry. Prior to the measurements, sample dissolutions and isotope separations were performed. Our results indicate a high ²²⁸Th isotope content in the skull bones and the teeth of animals, up to 179 Bq per kg of ash. The ²²⁶Ra and ²²⁸Ra concentrations were slightly lower. Activity concentrations of other isotopes were significantly lower or below the detection limit. We could not identify sources of technologically enhanced levels of ²²⁸Ra in the area we investigated; therefore we suggest that their origin is natural.

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