【摘要】 <正> 利用热释光测定陶片年代时,要准确地测出古陶器中所积存的热释光剂量,这首先就必须测准产生这一剂量的、存在于陶片中的天然放射性物质的含量。这是热释光对陶片断代研究中的一个重要环节。U、Th、⁴⁰K、⁸⁷Rb是天然存在的放射性核素,它们的放射性所给予陶片的年剂量率列于表1。自表1看出,在这五个天然放射性母核中,铀对年剂量率贡献最多。²³⁸U的天然丰度极大,在铀系中,氡是一种气体,它有可能从陶片中逸散。从表2看出,氡及其子体对年剂量率的贡献占了很大的比重。因此,在决定年剂量率时,氡的逸散与否,确实是关键之一。V.S.Desai等根据氡在土壤中移动的情况,安排了一个测定陶片中氡的实验,结果认为在土壤干燥条件下氡的逸散高达40％,而在潮湿的情况下,由于氡的溶解,逸散减少。此外,氡的逸散程度也与陶片类型有关。更多还原

【Abstract】 Dating ancient pottery by thermoluminescence is a new technique, but there are still some problems which have to be studied. Based on the sequential decay in natural radioactive series, an experimental method was created to determine the radon escape fom models of antique pottery and more acurate data could be acquired for the calculation of year dose rate. The results showed that the radon escape was less then 3% in the models of several typical kinds of pottery.更多还原