岩庄陨石的热释光位移和热事件年代研究

TL shifts and age of thermal events of Yanzhuang meteorite

通过对岩庄陨石自然热释光的测定、退火及β辐照诱发热释光(以下简称TL)实验,发现此陨石的热释光存在着两种特殊现象:(1)陨石样品在500℃温度下退火后,经β射线辐照诱发TL,其峰温随辐照剂量的增大而向低温方向移动,并存在着一定的移动规律;(2)陨石样品经均匀地升温退火,退火温度达600℃以上其诱发TL峰温比未经退火的峰温要高。岩庄陨石样品由黑色与浅色两部分组成,两部分样品的等效β剂量测定结果分别为9238Gy和25753Gy,按年剂量率0.1Gy/a计算,结果说明这两部分组成的热事件年代不一样,受热历史也不相同。

Two special TL phenomena have been found in Yanzhuang meteorite through the determination of the natural TL, annealed TL and induced TL by β radiation: l.when the sample of Yanzhuang meteorite is annealed at temperature up to 500℃, the TL peak induced by β rays moves to lower temperature with the increasing of irradiation dose; 2.when the annealed temperature is greater than 600℃, the TL peak temperature of the annealed sample is higher than that of the unannealed sample. Yanzhuang meteorite is composed of black and light parts. The equivalent β dose for the two parts are 9238 Gy and 25753 Gy respectively .showing that the thermal events age for the two parts in the meteorite is not equal, and their thermal histories are not the same, either.