Natural radioactivity in soils of the state of Rio de Janeiro (Brazil): Radiological characterization and relationships to geological formation, soil types and soil properties

Ribeiro, F. C. A.; Silva, J.I.R.; Lima, Eduardo; Sobrinho, Nelson Moura Brasil do Amaral; Pérez, Daniel Vidal; Lauria, Dejanira da Costa

doi:10.1016/j.jenvrad.2017.11.017

Cited by 69 publications

(25 citation statements)

References 26 publications

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“…The uncertainties presented are the propagated count-rates standard deviations.The values presented in Table3are within the range of values normally found in the soil, as described in the worldwide literature, with an average value of 35 Bq.kg -1 for the 232 Th, 30 Bq.kg-1 for the226 Ra and 400 Bq.kg -1 for the 40 K[21]. In the national literature, similar values were also found byLeal et al (2020), in soils in the state of Pernambuco, with an average value of 37 Bq.kg-1 for the 232 Th, 62 Bq.kg -1 for the226 Ra and 464 Bq.kg -1 for the 40 K[12] Ribeiro et al (2018). evaluated soils in the state of Rio de Janeiro and obtained average values of 74 Bq.kg -1 for the 232 Th, 32 Bq.kg -1 for the226 Ra, and 114 Bq.kg -1 for the40 K [9].…”

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confidence: 69%

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Determination of the activity concentration of 226Ra, 232Th, 40K and the concentration of 222Rn in soil samples of the Campos Gerais region (Paraná)

2021

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In the Campos Gerais region of Paraná there are few literature that evaluate the concentrations of natural radioactivity. Thus, the aim of the present work was to determine activity concentrations of 226Ra, 232Th, 40K and 222Rn concentration in soil samples from Telêmaco Borba, Tibagi, Curiúva, Ventania, Lageado Bonito and Ortigueira. The soil samples, with about 2 kg, were collected on the surface at points near the river bed, making sure that the soil is not under the agriculture influence. Gamma-ray spectrometry analyzes were performed with a NaI(Tl) scintillation detector, with dimensions of 76 mm in diameter, 152 mm in height and 8 cm of lead shield. The 222Rn concentration determinations were performed by means of the sealed can technique, using as track detector a polycarbonate of domestic manufacture. The results obtained for the activity concentration varied from <4.2 ± 1.2 Bq.kg-1 to 290.2 ± 1.7 Bq.kg-1 for the 40K, of 23.3 ± 1.1 Bq. kg-1 to 36.5 ± 1.1 Bq.kg-1 for the 226Ra and from 52.6 ± 1.9 Bq.kg-1 to 70.5 ± 2 Bq.kg-1 for the 232Th. The results for the 222Rn concentration ranged from 4 ± 3 Bq.m-3 to 1147 ± 326 Bq.m-3. Two of the six soil samples presented radon concentrations above the threshold established by the European Commission for Radiological Protection of 200 Bq.m-3, for internal environments. The concentrations of 226Ra and 232Th are within the limits, showing the importance of future investigating the origin of this radon.

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confidence: 69%

“…regions not yet studied, evaluate risks to the population [3], verify the local geological influence on the level of radioactivity [4][5][6], and assess the influence of agriculture on radiation levels [7]. In Brazil, several works were carried out with the same objectives mentioned [8][9][10][11][12].…”

Section: Natural Radioactivitymentioning

confidence: 99%

Determination of the activity concentration of 226Ra, 232Th, 40K and the concentration of 222Rn in soil samples of the Campos Gerais region (Paraná)

2021

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“…Soil properties such as pH, clay minerals, Ca 2+ , K + and organic matter, the parent material composition, the weathering degree [20], as well as the soil management (especially fertilization) [21], are directly related to the retention and absorption of radioelements by plants [22]. To assess the effects of natural and anthropogenic processes on the concentrations of radioelements in environmental compartments, the enrichment factor (EF) and the bioaccumulation factor (BAF) have been used.…”

Section: Introductionmentioning

confidence: 99%

Long Term Application of Fertilizers in Eastern Amazon and Effect on Uranium and Thorium Levels in Soils

et al. 2021

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In recent years, the use of fertilizers has increased in the Amazon. Phosphate fertilizers, which are commonly used, can present high concentrations of radioelements. In the present study, the activity concentrations of uranium (U) and thorium (Th) in Oxisols and Ultisols cultivated with citrus (Citrus sinensis (L.) Osbeck), oil palm (Elaeis guineensis Jacq.) and black pepper (Piper nigrum L.), with 26, 10 and 5 years of implantation, respectively, were evaluated. The potential risk of contamination was estimated by the enrichment (EF) and bioaccumulation (BAF) factors. Pearson’s correlation coefficients indicated a significant relationship between the concentrations of U and Th in soil and plant and the soil properties pH, Ca2+, Mg2+, K+ and P. The enrichment (EF < 2) and bioaccumulation (0.01 < BAF < 0.05) factors were low. In plant tissues, the concentrations of 238U followed the order: citrus > black pepper > oil palm, and the concentrations of 232Th followed the sequence: black pepper >> citrus > oil palm. The activity concentrations of 238U and 232Th in the soil cultivated with black pepper, as well as in the soil of the reference area close to the citrus plantation, were higher than the world average values of 35 and 30 Bq kg−1, respectively, established by the United Nations Scientific Committee on Effects of Atomic Radiation. Perennial crops that are fertilized annually must be monitored by environmental agencies due the accumulation of elements that can promote potential risks to human health.

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“…Many studies in this field are focusing on the measurements of radioactivity concentrations to determine the areas of high levels and correlation between radioactivity in soil and non-radioactivity in soil and geological structure of areas under study (Kannan et. Al, 2002;Matiullah et al, 2004;El-Arabi, 2005;Sahoo et al, 2011;Rashed-Nizam et al, 2015;Idriss et al, 2016;Nkuba et al, 2017;Ribeiro et al 2018). In Sudan, there are some previous research conducted to study the radioactivity concentrations of 238 U, 232 Th and 40 K in various environmental compartments (Osman et.…”

Section: Introductionmentioning

confidence: 99%

Soil radioactivity and elemental characterization of area proposed for the first nuclear power plant at Red Sea state, eastern Sudan

Abdoun¹

2020

OSJ

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This work was carried out with the aim to establish baseline data of soil radioactivity prior commissioning the first nuclear power plant for electricity production in the Sudan. A total of 105 soil samples from the proposed area were collected and analyzed using Gamma-ray spectrometer, X-ray Fluorescence and Atomic Absorption. Ambient dose rates were measured during sampling using radiation survey meters. Based on radionuclides in soil; some radiological hazard indices (such as absorbed dose rates, Radium-Equivalent Activity, External Hazard, and Gamma index) were computed. The results exhibit that226Ra, 232Th,40Kand 137Cs concentration ranged from0.55-88.9, 1.63-76.6, 24-1100 and 0.001-1.03 Bq/kg with an average value of10.43, 11.12, 361.2and 0.045Bq/kg respectively. The average value of absorbed dose rate(29.92nGy/h), Radium equivalent (70.55 Bq/Kg), external hazard (0.19), Gamma index. (0.25) and those parameters are lower than the corresponding global average. The results of the study revealed that the average values of 226Ra, 232Th, 40K and 137Cs fall within the global average value. GIS Predictive exhibited the spatial distribution of radioactivity trends with low levels at eastern part towards the Red Sea while high values observed at the desert (western part). This trend in addition to low levels has a very good impact to decision makers for consideration in site selection of NPP. Pearson correlation coefficient shows a correlation between the variables 226Ra and 232Th (0.69); Cr and Au (0.82); Br and Nb (0.84),Hf and Sb (+0.75) with no significant correlations between radioactive and radioactive elements. Keywords: Road map, GIS, Gamma-ray Spectrometer, Effective dose.

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Natural radioactivity in soils of the state of Rio de Janeiro (Brazil): Radiological characterization and relationships to geological formation, soil types and soil properties

Cited by 69 publications

References 26 publications

Determination of the activity concentration of 226Ra, 232Th, 40K and the concentration of 222Rn in soil samples of the Campos Gerais region (Paraná)

Determination of the activity concentration of 226Ra, 232Th, 40K and the concentration of 222Rn in soil samples of the Campos Gerais region (Paraná)

Long Term Application of Fertilizers in Eastern Amazon and Effect on Uranium and Thorium Levels in Soils

Soil radioactivity and elemental characterization of area proposed for the first nuclear power plant at Red Sea state, eastern Sudan

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