An exploratory study of cosmic-ray stratigraphy

在过去的300年中，以千年时间分辨率分析了圆顶富士冰芯（南极洲）中的宇宙成因铍-10。用化学萃取法分析了海洋沉积物中铍的同位素比值（10^Be/9^Be）。结合地球磁场古强度记录和宇宙成因碳-14记录，利用本研究获得的铍-10记录和先前从Dome Fuji冰芯获得的铍-10记录，构建了700 kyr以来的“宇宙射线地层学”标准曲线。

Cosmogenic beryllium-10 in the Dome Fuji ice core (Antarctica) was analyzed over the last 300 kyr with a millennial time resolution. Isotopic ratios of beryllium (10^Be/9^Be) in marine sediments were also analyzed using a chemical extraction method developed in this study. Taking paleointensity records of the earth's magnetic field and cosmogenic carbon-14 records into account, we constructed a standard curve of "cosmic-ray stratigraphy" over the past 700 kyr from the beryllium-10 records obtained in this study and obtained previously from the Dome Fuji ice core.