尼日利亚河流州产油区种植的木薯天然放射性和辐射危害指数评价

Irunkwor T. C, Abanjo N, Ogboi K. C
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摘要

用伽马射线能谱法评估和测量了河流州五个有石油泄漏、天然气燃烧、石油加注活动和非法手工炼油经营历史的社区种植的木薯作物消费的天然放射性和放射性危害指数。从5个群落中采集了5个木薯作物样本和5个土壤样本。所得结果用于评价该地区居民因食用木薯作物/主食而产生的土壤-木薯转移因子(TF)。238U土壤样品的平均活性范围为17.77±4.20Bq/kg ~ 31.84±3.20Bq/kg, 232Th土壤样品的平均活性范围为22.75±3.30Bq/kg ~ 33.82±4.70Bq/kg, 40K土壤样品的平均活性范围为110.44±9.60Bq/kg ~ 483.15±18.20Bq/kg,均在允许范围内,但高于对照土壤样品的平均活性。238U、232Th、383.20±28.10Bq/kg、482.30±35.80Bq/kg的木薯样品平均活性均高于对照样品,高于国际允许限量,分别为6.50±1.30Bq/kg ~ 29.70±6.20Bq/kg、5.80±2.20Bq/kg ~ 16.50±6.80Bq/kg、383.20±28.10Bq/kg ~ 482.30±35.80Bq/kg。研究结果显示,虽然部分木薯样本的辐射危害指标低于允许标准,但预计摄入木薯作物/主食的年有效剂量和终生癌症风险分别比国际允许限值0.29毫西弗/年高出2.9倍和5.9倍以上。从土壤到木薯的放射性核素转移率平均TF为232Th < 238U
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessment of Natural Radioactivity and Radiological Hazard indices in Cassava Cultivated in Oil Producing Area, Rivers State, Nigeria
The natural radioactivity and radiological hazard indices associated with the consumption of cassava crops grown in five communities with history of oil spillage, gas flaring, oil bunkering activities and operation of illegal artisanal oil refining in Rivers State was assessed and measured with gamma ray spectroscopy. Five samples of cassava crop and five samples of soil were collected from the five communities. The results obtained were used to evaluate the soil-to-cassava transfer factor (TF) due to ingestion of cassava crops/staple foods by inhabitants in the area. The mean activity of soil samples ranged from 17.77±4.20Bq/kg to 31.84±3.20Bq/kg for 238U, 22.75±3.30Bq/kg to 33.82±4.70Bq/kg for 232Th and 110.44±9.60Bq/kg to 483.15±18.20Bq/kg for 40K, and is within permissible standard, but is higher than the mean activity in the control. The mean activity of cassava samples ranged from 6.50±1.30Bq/kg to 29.70±6.20Bq/kg for 238U, 5.80±2.20Bq/kg to 16.50±6.80Bq/kg for 232Th and 383.20±28.10Bq/kg to 482.30±35.80Bq/kg for 40K and is found higher than those of the control samples, and the international permissible limits. The study revealed that although some of the radiological hazard indices in the cassava samples were below the allowable standards, the estimated committed annual effective dose and excess lifetime cancer risk due to ingestion of cassava crops/staple foods is respectively over 2.9 times and 5.9 times higher than the international permissible limit of 0.29mSv/y. The rate of radionuclides transferred from soilto-cassava has mean TF of 232Th < 238U
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