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Spatial relationship between the field-measured ambient gamma dose equivalent rate and geological conditions in a granitic area, Velence Hills, Hungary: An application of digital spatial analysis methods

Beltran Torres, Silvana and Petrik, Attila and Szabó, Katalin Zsuzsanna and Jordán, Győző and Yao, Jun and Szabó, Csaba (2018) Spatial relationship between the field-measured ambient gamma dose equivalent rate and geological conditions in a granitic area, Velence Hills, Hungary: An application of digital spatial analysis methods. JOURNAL OF ENVIRONMENTAL RADIOACTIVITY, 192. pp. 267-278. ISSN 0265-931X

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Abstract

In order to estimate the annual dose that the public receive from natural radioactivity, the identification of the potential risk areas is required which, in turn, necessitates understanding the relationship between the spatial distribution of natural radioactivity and the geogenic risk factors (e.g., rock types, presence of dikes, faults, physical conditions of soil, etc.). A detailed spatial analysis of outdoor ambient gamma dose equivalent rate was performed in the western side of Velence Hills, the largest outcropped granitic area in Hungary. In order to assess the role of local geology in the spatial distribution of gamma dose rates, field measurements were carried out at ground level at 300 sites along a 250 m x 250 m regular grid in a total surface of 19.8 km2. Digital image processing methods were applied to identify anomalies, heterogeneities and spatial patterns in the measured gamma dose rates, including local maxima and minima determination, digital cross sections, gradient magnitude and gradient direction, second derivative profile curvature, local variability, lineament density, 2D autocorrelation and directional variogram analyses. Statistical inference shows that different gamma dose rate levels are associated with the geological formations, with the highest level on the Carboniferous granite including outlying values. Moreover, digital image processing reveales that linear gamma dose rate spatial features are parallel to the SW-NE dike system and to the NW-SE main fractures. The results of this study underline the importance of understanding the role of geogenic risk factors influencing the ambient gamma dose equivalent rate received by public. The study also demonstrates the power of the image processing techniques for the identification of spatial pattern in field-measured geogenic radiation.

Item Type: Article
Additional Information: Funding Agency and Grant Number: National Research, Development and Innovation Office - NKFIH [PD115810, SNN 118101]; Stipendium Hungaricum Scholarship Program; Eotvos University [TTK/3489/1/2016]; Szent Istvan University [TTK/3489/1/2016]\n Funding text: This research has been supported by the National Research, Development and Innovation Office - NKFIH, PD115810 and SNN 118101 and the Stipendium Hungaricum Scholarship Program. The portable instrument FH40 G-L10 (Thermo Fisher Sceintific Inc.) used in the present project thanks to the KMOP 4.2.1/B-10-2010-002. This paper reports on the research at the GEM-RG Geochemistry, Modelling and Decisions Research Group. This is the 91st publication of the Lithosphere Fluid Research Laboratory (LRG), Eotvos University, which was carried out in agreement between Eotvos University and Szent Istvan University (TTK/3489/1/2016).\n \n Export Date: 6 November 2018 \n CODEN: JERAE \n Correspondence Address: Szabó, K.Z.; Department of Chemistry, Szent István University, Páter Károly utca 1, Hungary; email: sz_k_zs@yahoo.de
Uncontrolled Keywords: GIS; Digital image processing; Spatial modelling; Geochemical mapping;
Subjects: Q Science / természettudomány > QE Geology / földtudományok > QE02 Geochemistry / geokémia
SWORD Depositor: MTMT SWORD
Depositing User: MTMT SWORD
Date Deposited: 19 Nov 2018 13:27
Last Modified: 19 Nov 2018 13:27
URI: http://real.mtak.hu/id/eprint/87185

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