环境辐射场对热释光断代的影响

Influence of the enviromental radioactivities on TL dating

热释光强度的高低反映了周边环境中放射性元素含量的水平 ,但是油气藏的存在以及由其引起的油气扩散和元素迁移 ,有可能导致原本均一的环境辐射场出现局部异常区。据典型标本估算 ,钾含量 1%或铀、钍含量百万分之一的变化 ,都可能造成断代年龄 10 %左右的误差。

The change of TL intensity reflects contents varying of environmental radioelement around the sample. Due to the existence of oil/gas reservoir, then the oil/gas diffusion and elemental migration caused by the reservoir, abnormal environmental radioactivity area will appear in the originally uniform field. It is estimated that when varying of 1% K or one millionth of U or Th, the error of TL dating will reach about 10%.