For the first time, using ICP-MS/MS, the ²³⁴U, ²³⁵U, ²³⁶U, and ²³⁸U in the sediment samples from coastal region, Bangladesh, were measured as 5.13–5.48, 0.234–0.252, (2.70–4.59) × 10^–5, and 4.92–5.31 Bq kg⁻¹, and the ²³⁶U/²³⁸U atom ratios were (2.87–4.57) × 10^–8, indicating the predominate influence of global fallout on ²³⁶U. For the rock samples from hilly area, the corresponding concentrations were much higher as 18.7–4023, 0.902–173, 9.58 × 10^–5–1.29 × 10^–2, and 18.8–2279 Bq kg⁻¹, but the ²³⁶U/²³⁸U atom ratios were in the same range of (1.52–3.04) × 10^–8, indicating the ²³⁶U was primarily due to the natural nuclear reactions.

首次使用 ICP-MS/MS ，孟加拉国沿海地区沉积物样品中的²³⁴ U、²³⁵ U、²³⁶ U 和²³⁸ U 分别测量为 5.13–5.48、0.234–0.252，（2.70–4.59 ) × 10 ^–5 , 和 4.92–5.31 Bq kg ^-1 , ²³⁶ U/ ²³⁸ U 原子比为 (2.87–4.57) × 10 ^–8 , 表明全球沉降对²³⁶ U的主要影响。 对于岩石样品在丘陵地区，相应的浓度要高得多，分别为 18.7–4023、0.902–173、9.58 × 10 ^–5 –1.29 × 10 ^–2和 18.8–2279 Bq kg ^-1，但²³⁶ U/ ²³⁸ U 原子比在(1.52-3.04) × 10 ^{–8 的}范围内，表明²³⁶ U 主要是由于自然核反应。