Thorium and Uranium in sediment cores PS2185-3 and PS2185-6
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The 230Thex outlier at 277.5 cm is due to an anomalous 234U/238U of 0.58 (!);Probably diagenetic effect on U activities, as a bit below (297.5 cm) 234U/238U activity ratios...
深度为277.5 cm处的过剩钍-230(230Thex)异常值,系因0.58的异常铀-234与铀-238(234U/238U)比值(!)所致;该异常大概率系成岩作用对铀放射性活度的影响,而297.5 cm处的铀-234与铀-238活度比值则略低于该异常比值……



