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

Silvana Beltrán Torres, Attila Petrik, Katalin Zsuzsanna Szabó, G. Jordán, Jun Yao, Csaba Szabó

Research output: Contribution to journalArticle

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)267-278
Number of pages12
JournalJournal of Environmental Radioactivity
Volume192
DOIs
Publication statusPublished - Dec 1 2018

Fingerprint

Spatial Analysis
Hungary
spatial analysis
Radioactivity
Levees
Image processing
Geology
Spatial distribution
image processing
Soil
Granite
Radiation
digital image
risk factor
Autocorrelation
Dosimetry
dike
Rocks
spatial distribution
Derivatives

Keywords

  • Digital image processing
  • Geochemical mapping
  • GIS
  • Spatial modelling

ASJC Scopus subject areas

  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

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. / Torres, Silvana Beltrán; Petrik, Attila; Szabó, Katalin Zsuzsanna; Jordán, G.; Yao, Jun; Szabó, Csaba.

In: Journal of Environmental Radioactivity, Vol. 192, 01.12.2018, p. 267-278.

Research output: Contribution to journalArticle

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