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食用极度多雨地区从事刀耕火种农业的部落人群食用的食物而摄入的 ²³⁸U 和 ²³²Th。

Intake of ²³⁸U and ²³²Th through the consumption of foodstuffs by tribal populations practicing slash and burn agriculture in an extremely high rainfall area.

机构信息

Environmental Assessment Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India.

出版信息

J Environ Radioact. 2012 Jan;103(1):1-6. doi: 10.1016/j.jenvrad.2011.08.015. Epub 2011 Sep 24.

Abstract

The concentration of naturally occurring radionuclides ²³²Th, ²³⁸U was determined using Instrumental Neutron Activation Analysis (INAA) in different food groups namely cereals, vegetables, leafy vegetables, roots and tubers cultivated and consumed by tribal population residing around the proposed uranium mine. The study area is a part of rural area K. P. Mawthabah (Domiasiat) in the west Khasi Hills District of Meghalaya, India located in the tropical region of high rainfall that remains steeped in tribal tradition without much outside influence. Agriculture by Jhum (slash and burn) cultivation and animal husbandry are the main occupation of the tribal populations. A total of 89 samples from locally grown food products were analyzed. The concentration of ²³⁸U and ²³²Th in the soil of the study area was found to vary 1.6-15.5 and 2.0-5.0 times respectively to the average mean value observed in India. The estimated daily dietary intake of ²³⁸U and ²³²Th were 2.0 μg d⁻¹ (25 mBq d⁻¹) and 3.4 μg d⁻¹ (14 mBq d⁻¹) is comparable with reported range 0.5-5.0 μg d⁻¹ and 0.15-3.5 μg d⁻¹ respectively for the Asian population.

摘要

采用仪器中子活化分析(INAA)方法测定了拟开发铀矿区周围部落居民所食用的不同食物(谷物、蔬菜、叶菜、根茎类蔬菜)中天然放射性核素 ²³²Th 和 ²³⁸U 的浓度。研究区域位于印度梅加拉亚邦西卡西山区的 K.P.Mawthabah(多米亚西亚特)农村地区的一部分,属于热带高降雨地区,深受部落传统影响,几乎没有受到外界影响。刀耕火种农业和畜牧业是部落居民的主要职业。对当地种植的 89 种食品进行了分析。研究区域土壤中 ²³⁸U 和 ²³²Th 的浓度分别比印度平均水平高 1.6-15.5 倍和 2.0-5.0 倍。²³⁸U 和 ²³²Th 的估计日膳食摄入量分别为 2.0μg/d(25mBq/d)和 3.4μg/d(14mBq/d),与亚洲人群报道的范围 0.5-5.0μg/d 和 0.15-3.5μg/d 相当。

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