ionium age 锾年龄 ; 钍年积 ; 镭年积
ionium-excess dating method 锾过剩法 ; 鑀过剩法
ionium-deficiency dating method 锾亏损法 ; 鑀亏损法
ionium-radium geochronology 鑀–镭地质年代学
Ionium Records 出版者
N a naturally occurring radioisotope of thorium with a mass number of 230 锾 ( symbol: Io) [OBSOLETE]
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