214Bi/214Pb radioactivity ratio three-year monitoring in rainwater in Prague
Author:
Ambrosino Fabrizio1ORCID, Thinová Lenka2, Hýža Miroslav3, Sabbarese Carlo4
Affiliation:
1. Department of Mathematics and Physics , University of Campania “Luigi Vanvitelli” , Viale Lincoln 5, 81100 Caserta , Italy , and Faculty of Nuclear Sciences and Physical Engineering , Czech Technical University in Prague , Břehová 7, 11519 Prague , Czech Republic 2. Faculty of Nuclear Sciences and Physical Engineering , Czech Technical University in Prague , Břehová 7, 11519 Prague , Czech Republic 3. National Radiation Protection Institute (SÚRO) , Bartoškova 28, 14000 Prague , Czech Republic 4. Department of Mathematics and Physics , University of Campania “Luigi Vanvitelli” , Viale Lincoln 5, 81100 Caserta , Italy
Abstract
Abstract
Continuous monitoring of natural gamma radiation in air has been carried out, during December 2014 – January 2018, with 1-min cyclic measurement in Prague, Czech Republic using a NaI(Tl) probe. The 214Bi/214Pb ratio as a tracer in rainwater has been investigated to study its variations related to both the ambient dose equivalent rate per hour and the amount of rainfall. A hybrid methodology for time series analysis, composed of the aggregation of two signal decomposition methods (multiple linear regression and empirical mode decomposition) and one forecasting method (support vector regression), has been applied to identify the anomalies in the studied signals in order to better find correlations among them. The results show a strong correlation between the ambient dose equivalent rate and the 214Bi/214Pb ratio values and between both these signals and rainfall amount ≥5 mm/h. Furthermore, the considered descendants of radon are mainly responsible for the overall ambient dose equivalent rate.
Publisher
Walter de Gruyter GmbH
Subject
Waste Management and Disposal,Condensed Matter Physics,Safety, Risk, Reliability and Quality,Instrumentation,Nuclear Energy and Engineering,Nuclear and High Energy Physics
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