The ²³⁰Th dating (²³⁸U–²³⁴U–²³⁰Th dating method) has become one of the most important dating methods for Quaternary research. However, the ²³⁰Th/²³²Th ratio of 4.4 ± 2.2ⅹ10⁻⁶ is widely used for age correction in ²³⁰Th dating method. Here, we collected active speleothems with exactly known age and zero-year-old calcium carbonate from caves and dated them by ²³⁰Th dating. Our data indicated that the initial ²³⁰Th/²³²Th ratio can be one order of magnitude higher than the ratio of 4.4 ± 2.2 × 10⁻⁶. High initial ²³⁰Th/²³²Th ratio may result in false and comparatively old calculated age than the real age of young samples with low ²³⁸U concentration. So, the accurate initial ²³⁰Th/²³²Th ratio of active speleothem deposited in the same cave, instead of the general initial ²³⁰Th/²³²Th ratio, is essential for the precise age correction of young speleothem samples of low ²³⁸U concentration. Finally, we proposed a procedure to correlate modern observation and speleothem based paleoclimate reconstruction, on the basis of precise ²³⁰Th age which corrected by the true initial ²³⁰Th/²³²Th ratio.

在²³⁰钍约会（²³⁸ U- ²³⁴ U- ²³⁰的Th测年法）已成为最重要的约会方法第四纪研究之一。然而，²³⁰ Th/ ²³² Th比值4.4±2.2ⅹ10 ^-6被广泛用于²³⁰ Th定年法的年龄校正。在这里，我们从洞穴中收集了具有确切年龄和零年历史的碳酸钙的活跃洞穴，并通过²³⁰ Th 测年对其进行了测年。我们的数据表明，初始的²³⁰ Th/ ²³² Th 比值可以比 4.4 ± 2.2 × 10 ^-6的比值高一个数量级。高初始²³⁰Th/ ²³² Th 比值可能会导致错误的计算年龄比具有低²³⁸ U 浓度的年轻样品的真实年龄要大。因此，准确的初始²³⁰ Th/ ²³² Th 比值沉积在同一洞穴中的活性岩藻，而不是一般的初始²³⁰ Th/ ²³² Th 比，对于低²³⁸ U 浓度的年轻岩藻样品的精确年龄校正至关重要。最后，我们在精确的²³⁰ Th 年龄的基础上，提出了一种将现代观​​测和基于洞穴的古气候重建相关联的程序，该年龄是由真实的初始²³⁰ Th/ ²³² Th 比值校正的。