Simultaneous determination of Ra-226 and Ra-228 in water using spectrum stripping method by LSC. - Xia, Ming-Ming; Liang, Yong-Guang; Yu, Guo-Bing; Zhu, Jian-Ping; Cheng, Shi-Si; Tian, Chao; Xu, Tao; Wu, Yi-Rui (Journal of Radioanalytical & Nuclear Chemistry, 2020)