Zhu Jun, Olsen Curtis R
Department of Environmental, Earth and Ocean Sciences, University of Massachusetts Boston, Boston, MA 02125-3393, USA.
J Environ Radioact. 2009 Feb;100(2):192-7. doi: 10.1016/j.jenvrad.2008.11.013. Epub 2008 Dec 24.
Measured monthly atmospheric depositional fluxes of cosmogenically produced (7)Be ranged from 1 to 67 mBq/cm(2) in Boston, Massachusetts between September 2000 and August 2007. These fluxes exhibited seasonality and supported a decay-corrected (7)Be atmospheric depositional running inventory that ranged from 36 to 144 mBq/cm(2). Annual (7)Be deposition exhibited an increasing trend that may reflect a general decrease in solar activity and a general increase in precipitation over the 7-year sampling period. To investigate short-term sediment dynamics and accumulation patterns in the Neponset River estuary, we collected six sediment cores in July 2006 and measured (7)Be sediment inventories ranging from 48 to 546 mBq/cm(2) Comparisons of these sediment inventories with the (7)Be running inventory from atmospheric deposition (101 mBq/cm(2)) at the time of core collection indicated a large degree of spatial heterogeneity in sediment accumulation patterns and its potential use as a tool for assessing the impacts of environmental restoration activities in estuarine environments.
2000年9月至2007年8月期间，在马萨诸塞州波士顿测量的宇宙成因（7）Be的月大气沉积通量范围为1至67毫贝克勒尔/平方厘米。这些通量呈现出季节性，并支持了一个经衰变校正的（7）Be大气沉积运行存量，范围为36至144毫贝克勒尔/平方厘米。年度（7）Be沉积呈现出增加趋势，这可能反映了在7年采样期内太阳活动总体下降以及降水量总体增加。为了研究尼庞西特河口的短期沉积物动态和积累模式，我们于2006年7月收集了六个沉积物岩芯，并测量了（7）Be沉积物存量，范围为48至546毫贝克勒尔/平方厘米。将这些沉积物存量与岩芯采集时大气沉积的（7）Be运行存量（101毫贝克勒尔/平方厘米）进行比较，表明沉积物积累模式存在很大程度的空间异质性，以及其作为评估河口环境中环境恢复活动影响工具的潜在用途。
