Spatial distribution of radioisotope concentrations in the offshore water and sediment of the Bay of Bengal (Indian Ocean), Bangladesh

被引:5
|
作者
Bhuiyan, Md Khurshid Alam [1 ]
Siddique, Mohammad Abdul Momin [2 ]
Zafar, Mohammad [3 ]
Kamal, Abu Hena Mustafa [1 ]
机构
[1] Univ Putra Malaysia, Dept Anim Sci & Fishery, Fac Agr & Food Sci, Bintulu, Sarawak, Malaysia
[2] Univ Putra Malaysia, Fac Agr, Dept Aquaculture, Lab Aquat Biol & Ecol, Serdang 43400, Malaysia
[3] Univ Chittagong, Inst Marine Sci & Fisheries, Chittagong, Bangladesh
关键词
Bangladesh; Bay of Bengal; caesium-137; Indian Ocean; potassium-40; radio-ecology; natural radioactivity; radioactive nuclides; thorium-232; uranium-238; COXS BAZAR; RADIONUCLIDE CONCENTRATIONS; SEA-WATER; RADIOACTIVITY; RIVER;
D O I
10.1080/10256016.2013.830613
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Concentrations of natural and fall-out radionuclides in the offshore seawater and sediment from some parts of the Bay of Bengal, Bangladesh, were determined using a coaxial germanium detector. The average activities of U-238, Th-232, K-40 and Cs-137 were recorded as 31.2 +/- 5.8, 51.9 +/- 9.4, 686.4 +/- 170.5 and 0.5 +/- 0.6 Bq kg(-1) dry weight, respectively, for sediment, and 4.8 +/- 1.2, 5.4 +/- 1.2 and 39.1 +/- 8.6 Bq L-1 for U-238, Th-232 and K-40, respectively, in seawater. The concentration of Cs-137 in seawater was below the detection limit. The concentration of sediment U-238 was found to be positively correlated with Th-232 (, p<0.05) and K-40 (r=0.96, p<0.01), while Th-232 was positively correlated with K-40 (r=0.91, p<0.05). In sediment, the concentration of U-238 was negatively correlated (r=-0.86, p<0.05) with sea depth. In the seawater sample, the only significant relationship found was between concentration of Th-232 and water depth (r=-0.86, p<0.05). One-factor analysis of variance (ANOVA) showed that the level of radioisotope concentrations of seawater and sediment was highly significant for U-238 (F=122, df=11, p=0.01), Th-232 (F=143, df=11, p=0.01) and K-40 (F=86, df=11, p=0.01). The results showed that the level of radioactivity decreased from coast to open sea. Imminent threat due to radioactivity was not observed in these parts of the Bay of Bengal.
引用
收藏
页码:134 / 141
页数:8
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