不平衡
地质学
沉积物
剂量率
铀
衰变链
分层(种子)
地球化学
句号(音乐)
水分
矿物学
古生物学
放射化学
化学
医学
种子休眠
材料科学
物理
发芽
植物
有机化学
休眠
生物
核物理学
声学
冶金
眼科
作者
Frank Preusser,D. Degering,Alexander Fülling,Johannes Miocic
出处
期刊:Geochronometria
[De Gruyter]
日期:2023-01-01
卷期号:50 (1): 28-49
标识
DOI:10.2478/geochr-2023-0003
摘要
Abstract This study focusses on dose rate determination in complex settings in two drill cores from the site of Niederweningen, northern Switzerland. A crosscheck with a certified standard material and neutron activation analyses (NAA) reveals an overall good performance of high-resolution gamma spectrometry (HR-GS) when determining dose rate-relevant elements. A second focus is on average water content during burial, by comparing measured sediment moisture with water uptake capability. Furthermore, layer models are used to investigate the impact of inhomogeneous stratification on dose rate. Finally, different scenarios to correct for radioactive disequilibrium in the uranium decay chain are investigated. While most of the applied corrections appear to have only a minor to moderate effect on age calculation, the results for one core are contradictory. Possibly, some of the applied correction scenarios are not reflecting the complex natural setting sufficiently, in particular average sediment moisture during burial and the timing of radioactive disequilibrium might be incorrectly estimated. While deposition in one core can be quite securely attributed to the period 100–70 ka, assigning the sediment sequence in the other core to the time between ca. 130 ka and 90 ka remains to some extent insecure.
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