Natural and Anthropogenic Radionuclides in Atmospheric Air and Assessment of Inhalation Dose over Brick Field Areas, Dhaka, Bangladesh

IF 1 Q4 CHEMISTRY, INORGANIC & NUCLEAR Radiochemistry Pub Date : 2025-04-05 DOI:10.1134/S1066362225010138

S. Islam, N. M. Aranna, J. Ferdous, P. K. Bakshi

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Abstract

The concentrations of natural and anthropogenic radionuclides in the atmospheric air over the coal-fired brick activity at the locations of Dhamrai, Savar, and Ashulia in Dhaka, Bangladesh, were measured. High-resolution HPGe gamma-ray spectrometry was used for analyzing 18 particulate samples collected from this area. The identified radioisotopes were ²²⁶Ra, ²³²Th, ¹³⁷Cs, and ⁴⁰K. The measured activity concentrations of ²²⁶Ra, ²³²Th, and ⁴⁰K ranged from 0.016 ± 0.002 to 10.1 ± 2.2, from 0.006 ± 0.002 to 1.8 ± 1.6, and from 1.2 ± 0.06 to 2.4 ± 0.08 mBq/m³, respectively, with the average values of 3.0 ± 0.7, 0.63 ± 0.4, and 1.1 ± 0.04 mBq/m³, respectively. The activity concentrations of ²²⁶Ra and ²³²Th exceed the word average values in atmospheric air. Anthropogenic radiocesium (¹³⁷Cs) was identified in several air samples. The average activity concentration of ¹³⁷Cs was found to be 0.026 ± 0.003 mBq/m³. The order of the radionuclides present in the air particulate matter is ²²⁶Ra > ²³²Th > ⁴⁰K > ¹³⁷Cs. The total annual effective inhalation dose due to natural radioisotopes was found to be 93 and 27 μSv/year for adults and infants, respectively, which was below the ICRP permissible limit of 2.4 mSv/year. The main contributor to the inhalation dosage in both adults and infants was ²³²Th.

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孟加拉国达卡砖场地区大气中的天然和人为放射性核素及吸入剂量评估

测量了孟加拉国达卡Dhamrai、Savar和Ashulia地区燃煤砖厂上空大气中自然和人为放射性核素的浓度。采用高分辨率HPGe伽马能谱法分析了从该地区收集的18个颗粒样品。确定的放射性同位素为226Ra、232Th、137Cs和40K。226Ra、232Th和40K活性浓度分别为0.016±0.002 ~ 10.1±2.2、0.006±0.002 ~ 1.8±1.6和1.2±0.06 ~ 2.4±0.08 mBq/m3，平均值分别为3.0±0.7、0.63±0.4和1.1±0.04 mBq/m3。大气中226Ra和232Th活性浓度超过世界平均值。在几个空气样本中鉴定出人为放射性铯（137Cs）。137Cs的平均活性浓度为0.026±0.003 mBq/m3。空气颗粒物中存在的放射性核素的顺序为：226Ra >；232的在40 k比;137 cs。天然放射性同位素对成人和婴儿的年有效吸入剂量分别为93 μSv/年和27 μSv/年，低于ICRP允许限值2.4 mSv/年。成人和婴儿吸入剂量的主要贡献者是232Th。

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来源期刊

Radiochemistry CHEMISTRY, INORGANIC & NUCLEAR-

CiteScore

1.30

自引率

33.30%

发文量

期刊介绍： Radiochemistry is a journal that covers the theoretical and applied aspects of radiochemistry, including basic nuclear physical properties of radionuclides; chemistry of radioactive elements and their compounds; the occurrence and behavior of natural and artificial radionuclides in the environment; nuclear fuel cycle; radiochemical analysis methods and devices; production and isolation of radionuclides, synthesis of labeled compounds, new applications of radioactive tracers; radiochemical aspects of nuclear medicine; radiation chemistry and after-effects of nuclear transformations.