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首页> 外文会议>La Rábida International Scientific Meeting on Nuclear Physics >~(210)Pb-Dating of Pb Deposition in Five Sediment Cores from Ria of Vigo (NW Spain): γ-Spectrometry and CRS Model
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~(210)Pb-Dating of Pb Deposition in Five Sediment Cores from Ria of Vigo (NW Spain): γ-Spectrometry and CRS Model

机译：〜（210）PB沉积在Vigo（NW Spain）的五个沉积物中的PB沉积：γ-光谱法和CRS模型

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Sediment sampleswere obtained during July 2012 in five intertidal muddy, La Coru?a, Pontedeume, Cedeira, Betanzos and Ferrol. The cores (L, P, C, B and F) were carefully collected with a hand-driven PVC coring pipe of 60.2mminner diameter. Recoveries were 50 cm. Cores were collected in the inner part of the Rias, sliced in situ in 25 layers of 2-cm thickness obtaining 125 samples, stored in pre-cleaned plastic zip bags, and kept at 4 ?C. Sediment sub-samples were dried at 45±5 ?C to constant weight, and water content was determined. The chronologies and sediment accumulation rates for the five sediment cores have been established by applying three physical-mathematical models, C.F:C.S (Constant Flux: Constant Sedimentation), C.R.S (Constant Rate and Supply) and C.R.S—M.V (Constant Rate and Supply— Minimum Variances) which are based on obtaining in-excess ~(210)Pb (~(210)Pbunsupported) (R. García Tenorio, The ~(210)Pb dating method and its application in sediments, 1988). The resulting chronologies were validated using the pollution (L. Eduardo et al., A 700 year record of combustion-derived pollution in northern Spain: Tools to identify the Holocene/Anthropocene transition in coastal environments, 2014; F. Martín Garrido, Evaluación mediante datación con ~(210)Pb del efecto antropogénico en los procesos de sedimentación de las Rías de Vigo y Muros, 2006) instead of using the artificial fallout radionuclides ~(137)Cs and ~(241)Am because for ~(137)Cs migration is observed and ~(241)Am is not observed. Finally, the model that best fits for the pollution data in the study areas has been the CRS model. In the Ferrol sediment core it was necessary to join layers, since the amount of sample collected in each section was insufficient. Therefore, boxes were filled with sediment corresponding to 4 cmlayers loosing resolution.
机译：沉积物样品在2012年7月在五个Intertival Muddy，La Coru？A，PonteDeume，Cedeira，Betanzos和Ferrol。用60.2mmminner直径的手动PVC取芯管小心地收集芯（L，P，C，B和F）。回收率为50厘米。在丽裂的内部收集核心，在25层的2厘米厚度的25层上切割125样品，储存在预清洗的塑料拉链袋中，并保持在4℃。将沉积物亚样品在45±5℃下干燥至恒重，测定水含量。通过应用三种物理数学模型，CF：CS（恒定通量：恒定沉降），CRS（恒定速率和供应）和CRS-MV（恒定速率和供应，已经建立了五个沉积物核心的时间和沉积物累积速率基于过量〜（210）Pb（〜（210）Pbunsupported）（R.GarcíaGenorio，〜（210）Pb约会方法及其在沉积物中的应用及其在沉积物中的应用，最小差异）。通过污染验证所得的时间顺序（L. Eduardo等，北部燃烧污染的700年记录：工具，以确定沿海环境中的全肾上腺/人类过渡，2014;F.MartínGarrido，EvaluaciónMediante DataciónCon〜（210）PB Del EfectoAntropogénicoen Los Procesos deSedimentacióndeLasRíasdegigoyMuros，2006）而不是使用人工辐射放射性核素〜（137）Cs和〜（241）AM，因为〜（137）CS观察到迁移，并未观察到〜（241）。最后，最适合研究领域污染数据的模型是CRS模型。在铁罗尔沉积物核心中，需要加入层，因为每个部分收集的样品量不足。因此，盒子填充了对应于4个CMLayers的沉积物，失去了分辨率。

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