摘要
古剂量(DE)是光释光测年中一个重要参数,前人研究中利用标准生长曲线法(SGC)得到测量的多个单测片等效剂量值(De)作算术平均作为样品的古剂量,这由于没有考虑单个测片相应的De误差而未见由此法得到古剂量最优估计(De极大似然估计值)的计算方法。本文通过数学分析得到了由SGC法计算单个测片的De误差并计算了De极大似然估计,检验了此计算方法的可靠性并讨论了其适应性。我们发现对于同一样品的同样测片,用本文提出的计算法得到的单测片De误差与单片再生剂量法(SAR)计算的单测片De误差具有很好的一致性,也即说明了此法的可靠性;经讨论知对于同一样品的多个测片的De值分布,极大似然估计更接近于真实值,相比于其他估计法为更优的估计法,而样品De极大似然估计的一个重要参数为单个测片的De误差。
Background: Equivalent dose (De) is one of the most important parameters in OSL dating. In the standardized growth curve (SGC) method for De determination, the arithmetic average values of all Des were taken as a sample's final De. However, without De error for each individual aliquot, it is not possible to determine the De maximum likelihood estimation value use SGC. Purpose: In this study, we try to estimate the error for each individual aliquot, and then obtain maximum likelihood estimation of a De. Methods: We found that the De errors by our method and the SAR method are in good agreement. Results & Conclusions: For a sample with multi-aliquot Des, the maximum likelihood estimation is more close to the actual value, and the maximum likelihood estimation method is better than other estimate methods used.
出处
《核技术》
CAS
CSCD
北大核心
2013年第3期31-36,共6页
Nuclear Techniques