Determination of natural radioactivity levels in soil samples from irrigated vegetable farming land in and around Addis Ababa, Ethiopia.

IF 0.8 4区环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES

Radiation protection dosimetry Pub Date : 2024-12-06 DOI:10.1093/rpd/ncae203

Tamiru Bayissa Hundie, Tilahun Tesfaye Deressu

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Abstract

Soil samples were collected from vegetable agricultural areas in and around Addis Ababa, and their levels of radioactivity were measured. Gamma spectrometry with high-purity germanium detector was used to quantify radioactivity level. The average concentration of 226Ra, 232Th, and 40K were 32.8 ± 2.1, 62.4 ± 4.4, and 544.3 ± 23.3 Bq kg-1 respectively. The mean values of 232Th and 40K are higher, whereas the value of 226Ra is comparable with world average values. Radiological hazard indices, including radium equivalent activity (Raeq), absorbed dose rate (Dr), outdoor annual effective dose equivalent (Deff), external hazard index (Hex), internal hazard index (Hin), and gamma radiation representative level index (Iγ), were calculated based on the activity concentration of 226Ra, 232Th and 40K. The mean values were 163.9 Bq kg-1, 78.7 nGy h-1, 0.10 mSv y-1, 0.44, 0.53, and 0.60 respectively. All indices are lower than global recommended limit values. These results revealed that radiation hazard due to radionuclides in the soil of the study area is insignificant.

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测定埃塞俄比亚亚的斯亚贝巴及其周边地区灌溉菜地土壤样本中的天然放射性水平。

从亚的斯亚贝巴及其周边地区的蔬菜农业区采集了土壤样本，并对其放射性水平进行了测量。使用伽马能谱仪和高纯锗探测器对放射性水平进行量化。226Ra、232Th 和 40K 的平均浓度分别为 32.8 ± 2.1、62.4 ± 4.4 和 544.3 ± 23.3 Bq kg-1。232Th 和 40K 的平均值较高，而 226Ra 的值与世界平均值相当。根据 226Ra、232Th 和 40K 的放射性活度浓度，计算了放射性危害指数，包括镭当量活度（Raeq）、吸收剂量率（Dr）、室外年有效剂量当量（Deff）、外部危害指数（Hex）、内部危害指数（Hin）和伽马辐射代表水平指数（Iγ）。平均值分别为 163.9 Bq kg-1、78.7 nGy h-1、0.10 mSv y-1、0.44、0.53 和 0.60。所有指数均低于全球建议限值。这些结果表明，研究地区土壤中放射性核素造成的辐射危害并不严重。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Radiation protection dosimetry 环境科学-公共卫生、环境卫生与职业卫生

CiteScore

1.40

自引率

10.00%

发文量

223

审稿时长

6-12 weeks

期刊介绍： Radiation Protection Dosimetry covers all aspects of personal and environmental dosimetry and monitoring, for both ionising and non-ionising radiations. This includes biological aspects, physical concepts, biophysical dosimetry, external and internal personal dosimetry and monitoring, environmental and workplace monitoring, accident dosimetry, and dosimetry related to the protection of patients. Particular emphasis is placed on papers covering the fundamentals of dosimetry; units, radiation quantities and conversion factors. Papers covering archaeological dating are included only if the fundamental measurement method or technique, such as thermoluminescence, has direct application to personal dosimetry measurements. Papers covering the dosimetric aspects of radon or other naturally occurring radioactive materials and low level radiation are included. Animal experiments and ecological sample measurements are not included unless there is a significant relevant content reason.