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首页> 外文期刊>Journal of oceanography >Incorporation rate measurements of 10Be, 230Th, 231Pa, and 239,240Pu radionuclides in manganese crust in the Pacific Ocean: A search for extraterrestrial material
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Incorporation rate measurements of 10Be, 230Th, 231Pa, and 239,240Pu radionuclides in manganese crust in the Pacific Ocean: A search for extraterrestrial material

机译：太平洋锰结壳中10Be，230Th，231Pa和239,240Pu放射性核素的掺入率测量：寻找外星物质

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摘要

In order to estimate the deposition rate of extraterrestrial material onto a manganese crust in a search for supernova debris, we analyzed the contents of 10Be, 230Th, 231Pa, and 239,240Pu in a sample of manganese crust collected from the North Pacific Ocean. On the basis of the depth profile of 10Be, the growth rate of the manganese crust was determined to be 2.3 mm Myr?1. The uptake rates of 10Be, 230Th, and 231Pa onto the manganese crust were estimated to be 0.22–0.44%, 0.11–0.73%, and 1.4–4.5%, respectively, as compared to the deposition rates onto the deep-sea sediments near the sampling station, while that for 239,240Pu was 0.14% as compared to the total inventory of seawater and sediment column. Assuming that sinking particles represent 0.11–4.5% of the uptake rates, the deposition rate of extraterrestrial material onto the manganese crust was estimated to be 2–800 μg cm?2Myr?1 according to the uptake of 10Be onto the manganese crust. Further, our estimate is similar to the value of 9–90 μg cm? 2Myr?1 obtained using the integrated global production rate of 10Be and the deposition rate of 10Be onto the manganese crust.
机译：为了估计在寻找超新星碎片时外星物质在锰壳上的沉积速率，我们分析了从北太平洋收集的锰壳样品中10Be，230Th，231Pa和239,240Pu的含量。根据10Be的深度分布，测得锰壳的生长速率为2.3mm Myr？1。据估计，锰在地壳上的10Be，230Th和231Pa的吸收率分别为0.22-0.44％，0.11-0.73％和1.4-4.5％，而在该区域附近的深海沉积物上的沉积率却很高。采样站，而239,240 Pu的采样站是海水和沉积物柱总存量的0.14％。假设下沉颗粒占吸收速率的0.11-4.5％，根据10Be在锰壳上的吸收量，外星物质在锰壳上的沉积速率估计为2-800μgcm？2Myr？1。此外，我们的估计值类似于9–90μgcm？使用10Be的综合全球生产率和10Be在锰壳上的沉积速率获得2Myr？1。

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