Determination of Radioactivity Level of<sup>238</sup>U, 232Th and<sup>40</sup>K in Surface Medium in Zhuhai City by in-situ Gamma-ray Spectrometry

Wang, Nanping; Xiao, Liu; Li, Canping; Huang, Ying; Pei, Shaoying; Liu, Shaomin; Xie, Fan; Ye-xun, Cheng

doi:10.1080/18811248.2005.9711040

Cited by 18 publications

(6 citation statements)

References 2 publications

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“…232 Th showed the highest mean concentration of 12.12 ppm within migmatite and gneissic rocks while the highest mean concentration of 238 U given 3.25 ppm was recorded within migmatite emplacement. These measured values are similar to other ground radiometric measurements obtained within Nigeria (Adagunodo et al 2019) and other parts of the world (Wang et al 2005, Norden & Forster 2006, Allan et al 2013. A high coefficient of variance (CV% > 50) was only observed in 238 U concentration values within younger granites and quaternary sediments, while low variance (CV% < 50) values were observed in the radioelement concentrations of all other rock units.…”

Section: Geostatistics Of the Petrological Unitssupporting

confidence: 87%

Spatial distribution of radiogenic heat in the Iullemmeden basin – Precambrian basement transition zone, NW Nigeria

Aisabokhae

Adeoye²

2021

geol

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The area which transcends the Precambrian basement complex onto the Sokoto sector of the Iullemme-den basin in northwestern Nigeria presents a unique prospect for geothermal exploration research in the absence of regional heat production data, despite its tectonic history and depositional characteristics. In this study, geophysical exploration employing radiometric technique was adopted to classify the petrologic units within the fringes of the Iullemmeden basin and the adjoining crystalline basement complex so as to estimate the radiogenic heat potential within the terrain that may support geothermal considerations. Airborne radiometric measurements acquired over the area were digitized and processed to obtain radioelement concentration maps and the K/Th/U ternary map. Results show that the ranges of measured concentrations of 40K, 238U and 232Th are 4.6 to 18.9%, 0.7 to 4.9 ppm and 4.6 to 18.9 ppm respectively. Radiogenic heat estimation derived from radioelement data within eight petrologic units comprising quaternary sediments, schist, carbonates, shale/clay, younger granites, older granites, gneissic rock and migmatite showed that the lowest radiogenic heat production estimates ranging from 0.27–0.66 μW∙m−3 were recorded in the sedimentary terrain within the quaternary sediments while the highest radiogenic heat production values of between 2.04 to 2.34 μW∙m−3 were recorded in the basement com-plex within gneissic rocks. The spatial distribution of radiogenic heat in the area showed an increased heat gradient within the basement complex and a diminishing heat gradient over the Iullemmeded basin.

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Section: Geostatistics Of the Petrological Unitssupporting

confidence: 87%

Spatial distribution of radiogenic heat in the Iullemmeden basin – Precambrian basement transition zone, NW Nigeria

Aisabokhae

Adeoye²

2021

geol

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“…Uranium and thorium concentrations are very high in granite in the Middle and Late Jurassic and Cretaceous age in Guangdong Province, China. The uranium and thorium levels in granite in the Doumen District in Zhuhai City are 213.5 + 159.6 and 146.7 + 7.1 Bq kg 21 , respectively (20) . So, high radium concentrations in soil in the Wutong Mountain area were observed.…”

Section: Resultsmentioning

confidence: 97%

Preliminary investigation of radon concentration in surface water and drinking water in Shenzhen City, South China

Wang

2015

Radiation Protection Dosimetry

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A radon survey in surface water and drinking water was conducted using a portable degassing system associated with an ionisation chamber AlphaGUARD (PQ2000) for understanding levels of dissolved radon ((222)Rn) concentration in different types of water sources and risk assessment of radon in drinking water in Shenzhen City (SC) with a population of 10 628 900 in 2013, Guangdong Province of China. The measurements show that arithmetic means ± standard deviations of radon ((222)Rn) concentration are 52.05 ± 6.64, 0.29 ± 0.26, 0.15 ± 0.23 and 0.37 ± 0.42 kBq m(-3) in spring water, surface water, large and small public water supplies, respectively. Only radon concentrations of two water samples collected in mountainous areas are more than 11.10 kBq m(-3), exceeding the limit of radon concentration in drinking water stipulated by the national standard of China (GB5749-2006). The annual effective doses due to radon in drinking water were also calculated. The investigation suggests that there are no risks caused by radon in the drinking water in SC.

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“…Counting time is 600 s at each measuring site. The measurement procedures were in accordance with Technique Regulation of Gamma-Ray Spectrometry on the Ground issued by The Ministry of Land and Resources of China [ 34 ]. The equivalent concentrations of 238 U and 232 Th and the concentration of 40 K can be acquired after getting the conversion factors of spectrometer [Eq.…”

Section: Methodsmentioning

confidence: 99%

Mapping radon hazard areas using 238U measurements and geological units: a study in a high background radiation city of China

Liu

Wang

Chu

et al. 2016

J Radioanal Nucl Chem

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In order to identify radon-prone areas and evaluate radon risk level, a soil gas radon survey combined with gamma-ray spectrometry measurements was carried out in Shenzhen City, south China. Meanwhile, the statistical analysis was applied to evaluate the distribution of measured results. This paper presents the methodology of the radon risk assessment. A radon risk map was accomplished based on a combination of soil gas radon concentration (RC), soil air permeability (Perm.) and uranium (238U) concentration. The results showed that the distribution of soil gas RC and radon-prone areas were closely related to geologic distribution of uranium (238U) and local lithology.

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Determination of Radioactivity Level of²³⁸U, 232Th and⁴⁰K in Surface Medium in Zhuhai City by in-situ Gamma-ray Spectrometry

Cited by 18 publications

References 2 publications

Spatial distribution of radiogenic heat in the Iullemmeden basin – Precambrian basement transition zone, NW Nigeria

Spatial distribution of radiogenic heat in the Iullemmeden basin – Precambrian basement transition zone, NW Nigeria

Preliminary investigation of radon concentration in surface water and drinking water in Shenzhen City, South China

Mapping radon hazard areas using 238U measurements and geological units: a study in a high background radiation city of China

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Determination of Radioactivity Level of238U, 232Th and40K in Surface Medium in Zhuhai City by in-situ Gamma-ray Spectrometry

Cited by 18 publications

References 2 publications

Spatial distribution of radiogenic heat in the Iullemmeden basin – Precambrian basement transition zone, NW Nigeria

Spatial distribution of radiogenic heat in the Iullemmeden basin – Precambrian basement transition zone, NW Nigeria

Preliminary investigation of radon concentration in surface water and drinking water in Shenzhen City, South China

Mapping radon hazard areas using 238U measurements and geological units: a study in a high background radiation city of China

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Determination of Radioactivity Level of²³⁸U, 232Th and⁴⁰K in Surface Medium in Zhuhai City by in-situ Gamma-ray Spectrometry