广东省部分地区土壤放射性核素的测定和剂量评估

doi:10.11720/wtyht.2020.1288

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Abstract

One of the main problems in the ecological researches is natural environmental radioactivity. In this study, the activity concentrations of naturally formed ²³⁸U, ²³²Th, ²²⁶Ra and ⁴⁰K radionuclides were measured for various types of soil samples collected from Guangdong Province. Samples in 49 siteswere selected within the study area. The concentration of radionuclides of ²³⁸U is in the range from 17.9 to 209.1 Bq/kg, with the average value being 84.3 Bq/kg; that of ²³²Th varies from 10.6 to 263.8 Bq/kg, with average value being 103.0 Bq/kg;that of ²²⁶Ra varies from 12.0 to 206.0 Bq/kg, with average value being 77.7 Bq/kg; and that of ⁴⁰K varies from 15.3 to 1557.6 Bq/kg, with average value being 463.3 Bq/kg. The gamma absorbed dose rates in air is in the range of 27.2~265.9 nGy/h, with an arithmetic mean of 126.8 nGy/h, while the annual effective dose rates (AEDR) are in the range of 33.3 to 326.1 μSv/y, with an arithmetic mean of 155.5 μSv/y. The calculated values of radium equivalent activity (Raeq) and external hazard index (Hex) for the soil samples in the study area is 260.7 (33.5~619.0) Bq/kg and 1.2(0.15~2.8), respectively. Sample sitesare assigned to regional bedrock, geomorphic landscape and soil type, respectively, resulting in three categorical variables. Random forest regression and correlation analysis show that the bedrock influences the levels of natural radioactivity in soils most seriously, followed by the soil type and then by the geomorphic landscape. The activities determined in Guangdong Province are generally higher than the average values of China and the values abroad, but are lower than the safe range of radioactive level.

Key words： soil environmental radioactivity gamma dose rate rock background Guangdong Province

Received: 20 May 2019 Published: 22 April 2020

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	Jian-Zhou YANG
	Jing-Jing GONG
	Shi-Xin TANG
	Shu-Qi HU

Cite this article:

Jian-Zhou YANG,Jing-Jing GONG,Shi-Xin TANG, et al. The determination of radioactivity concentrations in soil samples and dose assessment in parts of Guangdong Province[J]. Geophysical and Geochemical Exploration, 2020, 44(2): 419-425.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1288 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I2/419

Experimental parameters of HPGe γ-spectrometer

Map of sample sites,geomorphic landscape and bedrock distribution in Guangdong (Fig. modificated from reference[20])

The major activity concentration of soil samples

The variable importance of regional bedrock, soil type and geomorphic landscape

Boxplots for ²³⁸U,²³²Th,²²⁶Ra and ⁴⁰K(Bq/kg) in samples of bedrock, geomorphic landscape and soil type, respectively

The calculated and measured results of γ radiation absorbed dose rate of soil samples

Radiation hazard parameters of soil samples

Contrast of calculated and measured results of γ radiation absorbed dose rate of soil samples

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