Classification of soil samples according to their geographic origin using gamma-ray spectrometry and principal component analysis

Dragović, Snežana; Onjia, Antonije

doi:10.1016/j.jenvrad.2006.05.002

Cited by 74 publications

(25 citation statements)

References 17 publications

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“…Fundamental descriptive statistics of examined parameters are given in Table 6. The standard deviation was the greatest for 40 K, as similarly reported by Dragović and Onjia (2006) in SerbiaMontenegro, and the smallest for 232 Th. For this reason, it could be postulated that 40 K is specifically elevated possibly due to agricultural activities especially in the southern (plain) zone of the study area on both sides of canals (Fig.…”

Section: Radionuclide Concentrationsupporting

confidence: 82%

Geochemical and radionuclide profile of Tuzla geothermal field, Turkey

Baba

Deniz

Özcan

et al. 2007

Environ Monit Assess

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Tuzla geothermal basin is situated in north-western Turkey on the Biga Peninsula, which is located at the west end of the Northern Anatolian Fault system. Soil and water samples were collected between August 2003 and June 2004 to initiate development of a geochemical profile of surface and subsurface waters in the geothermal basin and radionuclide concentrations in soils. All water samples were found to fall within Turkish Water Quality Class 4, meaning they were remarkably contaminated for any water consumption sector (industrial, human use or agricultural) based on sodium and chloride ions. Such waters could be used only after appropriate water treatment. The water samples are of the chloride type in terms of geochemical evaluation. Preliminary geochemical evidence shows that the N-S flowing part of the Tuzla River acts as a natural barrier within the basin. Heavy metal concentrations in the soil samples show slight elevations, especially those obtained from the east part of the basin where thermal springs are dominant. Geochemical calculations were carried out with PHREEQC software to determine equilibrium concentration of chemical species and saturation indices, by which it is suggested that chloride is the most important ligand to mobilize the heavy metals in the studied system. In addition, the activity concentration and gamma-absorbed dose rates of the terrestrial naturally occurring radionuclides were determined in the soil using gamma-ray spectrometry. The soil activity ranged from 42.77 to 988.66 Bq kg(-1) (averaging 138 Bq kg(-1)) for ( 238 )U, 13.27 to 106.31 Bq kg(-1) (averaging 32.42 Bq kg(-1)) for ( 232 )Th, and 99.28 to 935.36 Bq kg(-1) (averaging 515.44 Bq kg(-1)) for ( 40 )K. The highest value of ( 238 )U was found in the soil samples obtained from an area close to the hot spring.

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Section: Radionuclide Concentrationsupporting

confidence: 82%

Geochemical and radionuclide profile of Tuzla geothermal field, Turkey

Baba

Deniz

Özcan

et al. 2007

Environ Monit Assess

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“…Its concentration in the environment depends on the type of rocks from which soil originates. This causes significant differences in concentrations of particular nuclides (Dragović and Onjia 2006). For example, radioactivities of 40 K and 226 Ra in the Northern Europe ranged between 140 and 1150 Bq/kg as well as 6 and 310 Bq/kg, respectively (UNSCEAR 2000).…”

Section: Introductionmentioning

confidence: 99%

Radionuclide activities in sediments on the northern coast of Spitsbergen

Wojtasik¹,

Świrydowicz²,

Burska³

et al. 2017

Polish Polar Research

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Abstract:The specific activity of natural gamma emitters like actinium ( 228 Ac), bismuth ( 212 Bi, 214 Bi), lead ( 212 Pb, 214 Pb), potassium ( 40 K), radium ( 224 Ra), thallium ( 208 Tl) and artificial radioisotope caesium ( 137 Cs) was measured in 2005 in the surface layer of marine sediments in the northern Svalbard: Wijdefjorden, Woodfjorden, Vestfjorden and Bockfjorden as well as in the freshwater reservoirs in Andre Land. Nonuniform spatial distribution of these radionuclides was found. Sediment sample from Bockfjorden had the highest specific activities of all natural radionuclides. The specific radioactivity of 137 Cs was much lower than specific radioactivities of natural radionuclides but there were differences between investigated locations. The distribution of 137 Cs is similar to persistent organic pollutants of the lake sediments in the area.

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“…Furthermore, because of advances in analytical instrumentation, it is now possible to generate large data sets that are difficult to evaluate using simple univariate statistical methods, especially due to their complexity and to their multivariate nature (Luo, 2006). Consequently, multivariate methods have been widely applied to investigate and interpret the large amounts of data generated by current spectrometric methods (Bagur-González et al, 2009;Dragovic and Onjia, 2006). Therefore, synergies obtained by the simultaneous study of multivariate statistics and elemental composition data, allow robust interpretations in geochemical and geological aspects (Gallego et al, 2013;Sielaff and Einas, 2007).…”

Section: Introductionmentioning

confidence: 99%