natural radioactivity meaning in English

天然放射性
天然活性
自然放射能
自然放射性

Natural radioactivity contains a store of valuable information .
天然放射性包含着许多有价值的信息。
Evaluation of natural radioactivity level in environment near a urarium mine
某天然铀矿附近环境放射性水平与评价
Investigation on natural radioactivity level of building materials in fujian , china
福建省建筑材料天然放射性水平调查分析
Investigation on measurement methods for natural radioactivity in environmental geological survey of qingdao city
青岛市天然放射性环境地质调查中测量方法探讨
Antiquities can be dated by measuring their natural radioactivity . popular techniques include " carbon - 14 dating " and " thermoluminescence dating " . they are useful tools in geological , anthropological and archaeological researches
透过量度古物内天然放射性物质的浓度，我们可以鉴定古物所属的年代，常用的技术包括碳- 14定年法和热释光定年法，对地质学人类学及考古学的研究都有莫大的帮助。

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