利用地面γ总量转换为空气吸收剂量率进行环境辐射水平评价——以桂阳县潘家村和永兴县土桥村实测数据为例

doi:10.11720/wtyht.2024.1060

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Abstract

China has accumulated massive data on total gamma radiation (γ) from the prolonged extensive surveys of uranium deposits. However, there is a marked lack of studies on radioactive environment assessment using these data. Based on the measurement principles of total gamma radiation and the absorbed dose rate in air, this study ascertained the relationships of the absorbed dose rate in air with the total natural gamma radiation and nuclide content and, accordingly, established the relationship between total gamma radiation and the absorbed dose rate in air. Furthermore, it analyzed the effects of instrument parameters on the measurement error, concluding that there existed a strictly linear relationship between the measured total gamma radiation and the absorbed dose rate in the air when b_K/b_U = 2.287 and b_Th/b_U = 0.430. Therefore, the b_K/b_U and b_Th/b_U ratios closer to both values correspond to more accurate absorbed dose rates in air converted from the measured total gamma radiation. Using the model of the Hunan Ionizing Radiation Measuring Station, this study calculated the coefficient for converting total gamma radiation into the absorbed dose rate in air, analyzed the error, and deduced the approximate uranium equivalent ranges of potassium and thorium in the instrument parameters. Furthermore, for the rock mass in Panjia Village, Guiyang County, Chenzhou City and the limestone area of Tuqiao Village in Yongxing County of the city, this study measured the total gamma radiation, gamma spectra, and absorbed dose rates in the air at the same stations. The results show that when the average nuclide content ratio C_K/C_U was less than 1 and C_Th/C_U ratio was less than 3, the absorbed dose rates in air estimated based on the total gamma radiation (measured using the FD3013 instrument) shared roughly the same error levels with those estimated based on energy spectra using the Beck formula, both yielding root mean square errors below 15%. As inferred from the average C_K/C_U and C_Th/C_U ratios of nuclides in China, the absorbed dose rate in air in most areas of China can be estimated using the total gamma radiation measured using an FD3013 instrument (or an instrument with similar performance). Overall, converting the total gamma radiation data from available extensive surveys of uranium deposits into effective absorbed dose rates in the air provides a methodological reference for rapid, large-area assessment of the external exposure level of natural radioactivity in the environment.

Key words： total gamma radiation gamma spectrum content of nuclides (uranium, thorium, and potassium) absorbed dose rate in air

Received: 13 February 2023 Published: 27 June 2024

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	Articles by authors
	Jun-Feng LIU
	Wen-Biao PENG
	Feng TAO
	Fan-Xing MENG
	Guang-Jing WEI
	Hong LIU
	Ju-Zhi DENG
	Hui CHEN
	Chen FU
	Pei-Jian WANG

Cite this article:

Jun-Feng LIU,Wen-Biao PENG,Feng TAO, et al. Assessing radiation levels in the environment by converting total natural gamma radiation into the absorbed dose rate in air: A case study of measured data from Panjia Village, Guiyang County and Tuqiao Village, Yongxing County[J]. Geophysical and Geochemical Exploration, 2024, 48(3): 868-875.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1060 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I3/868

Uranium equivalent of K and Th of different instruments ^[2]

Effect of b_K/b_U ratio and C_K/C_U ratio on conversion error of total gamma into air absorbed dose rate

Effect of b_Th/b_U ratio and C_Th/C_U ratio on conversion error of total gamma into air absorbed dose rate

Model nominal data of ionizing radiation measuring station in Hunan Province

The total number rate calculated by the standard model K, U, Th content

Equivalent uranium and error calculated by standard model K, U, Th content

According to the coefficient, the equivalent uranium is estimated as the absorbed dose rate of air and the error

Measured values on the model after instrument calibration

Estimation of equivalent uranium as air absorbed dose rate and error based on coefficients

Energy spectrum, equivalent uranium estimated air absorbed dose rate and measured air absorbed dose rate contour map

The error analysis between the estimated and measured air absorbed dose rates by equivalent uranium and γ energy spectra

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