Understanding of deep groundwater age characteristics in the Yangtze River Delta through the combined use of 14C and 81Kr - Shiang Lu; Zhaojun Xie; Xin Dai; Wei Jiang; Yueqing Xie; Andrew J. Love; Xulong Gong; Guo-Min Yang; Yan Zhang; Lei He; Zheng-Tian Lu; Rongbing Fu; et al. (Journal of Hydrology, 2026)