Gross alpha and beta activities in drinking water from Goiás state, Brazil

Raquel Maia Mingote; Regina Apolinária Nogueira; Heliana Ferreira Da Costa

doi:10.15392/bjrs.v7i3.410

Authors

Raquel Maia Mingote Comissão Nacional de Energia Nuclear - CNEN
Regina Apolinária Nogueira Centro Regional de Ciências Nucleares do Centro-Oeste - CRCN-CO / CNEN
Heliana Ferreira Da Costa CRCN-CO - Radioproteção

DOI:

https://doi.org/10.15392/bjrs.v7i3.410

Keywords:

radioactivity, liquid scintillation, censored data

Abstract

Detection of gross alpha and beta radioactivity is important for a quick surveying of both natural and anthropogenic radioactivity in water. Furthermore, gross alpha and gross beta parameters are included in Brazilian legislation on quality of drinking water. In this work, a low background liquid scintillation spectrometer was used to simultaneously determine gross alpha and gross beta in samples of the public water supplies in the state of Goiás, Brazil, during 2010-2015. Sample preparation involved evaporation to concentrate the sample ten-fold. The results indicate that the water meets the radioactivity standards required by the regulations MS 2914/2011 of the Brazilian Department of Health. Concerning the high level of censored observations, a statistical treatment of data was conducted by using analysis methods of censored data to provide a reference value of the gross alpha and beta radioactivity in drinking water from the state of Goiás. The estimated typical activities are very low, 0.030 Bq.L-1 and 0.058 Bq.L-1, for gross alpha and gross beta, respectively.

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Author Biographies

Regina Apolinária Nogueira, Centro Regional de Ciências Nucleares do Centro-Oeste - CRCN-CO / CNEN

CRCN-CO - Radioproteção

Heliana Ferreira Da Costa, CRCN-CO - Radioproteção

Departamento de Radioproteção.

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