Thorium / uranium dating of stalagmite PR-LA-1 (Cueva Larga, Puerto Rico)

Activity ratios were corrected for initial Th assuming an detrital weight ratio 232Th/238U = 0.13 ± 0.04 (corresponding to an activity ratio of the detritus in secular...放射性活度比（Activity ratios）针对初始钍（Th）进行了校正，设定碎屑重量比232Th/238U为0.13 ± 0.04（该比值对应碎屑处于长期平衡（secular equilibrium）时的活度比……）