M6, a monazite reference material for fission-track thermochronology. - Pang, Jianzhang; Ma, Yan; Zheng, Dewen; Li, Weixing; Zhang, Zhiyong; Yang, Jing; Zhang, Huiping; Wang, Ying; Ma, Xi; Yu, Jingxing; Wang, Yizhou; Li, Chaopeng (JAAS (Journal of Analytical Atomic Spectrometry), 2026)