基于钴源辐照的光释光测年方法研究
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摘要
由于国内外尚无有关以γ源为辐照源的释光测年方法的研究,本文基于传统光释光测年方法,探究并提出新的基于钴源辐照的光释光测年方法。钴源的剂量确定相对于β源更准确和方便,所以本文选用钴源代替β源。此外,在新方法中我们还着重探究和解决了三个个问题:第一个是怎样避免在钴源辐照时样品的曝光;第二个就是小样品在γ辐射场中不容易达不到电子平衡条件的问题;第三个就是新方法的分立BIN文件数据处理方法的问题。实验结果显示新方法测量的沉积物的年代和对应地层考古年代吻合度较高。也证明了新方法应用于释光测年上的可行性。新方法不但丰富了光释光测年的多样性,而且还为准确测量第四季沉积物年代提供新思路。
On the basis of the optical dating method that had been used, we founded a more reliable method.Compared with the traditional method, we chose the 60 Co as the irradiation source instead of the β source in the measurement for the optical dating of sediments. Because the dose determining of γ source( Co60 source) is more convenient and accurate than the β source. Furthermore, we solved three problems in this new method. First problem is how to keep the sample out of the sunlight when they are irradiated by the cobalt source; Second problem is electronic equilibrium condition for small sample in γ ray area is hard to reach. Third problem is the data processing method for OSL data when the BIN files are separated. The results showed that the age measured by the new method is correspond to the age of stratum archaeological dating. Which proved that this new method is reliable for optical dating. This new method not only enriched the variety of optical dating but also offered new ideas and accurate measurement for the dating of quaternary sediments.
On the basis of the optical dating method that had been used, we founded a more reliable method.Compared with the traditional method, we chose the 60 Co as the irradiation source instead of the β source in the measurement for the optical dating of sediments. Because the dose determining of γ source( Co60 source) is more convenient and accurate than the β source. Furthermore, we solved three problems in this new method. First problem is how to keep the sample out of the sunlight when they are irradiated by the cobalt source; Second problem is electronic equilibrium condition for small sample in γ ray area is hard to reach. Third problem is the data processing method for OSL data when the BIN files are separated. The results showed that the age measured by the new method is correspond to the age of stratum archaeological dating. Which proved that this new method is reliable for optical dating. This new method not only enriched the variety of optical dating but also offered new ideas and accurate measurement for the dating of quaternary sediments.
引文
[1]赖忠平,欧先交.光释光测年基本流程[J].地理科学进展,2013,32(05):683-693.
[2]张克旗,吴中海,吕同艳,冯卉.光释光测年法——综述及进展[J].地质通报,2015,34(01):183-203.
[3]D.J.Huntley,et al.:1985,Nature,V313,105-107.
[4]Aitken,M.J.:1985,Thermoluminescence Dating,Academic Press,London.
[5]Hutt,G.,et al.:1988,Quaternary Science Review,V.7,381-385.
[6]卢演俦.沉积物的光释光(OSL)测年简介[J].地质地球化学,1990(01):36-40.
[7]贾耀锋,黄春长,庞奖励,毛龙江,葛本伟.渭河流域东部全新世黄土-古土壤剖面光释光测年及其记录的土壤侵蚀事件[J].海洋地质与第四纪地质,2008(03):73-83.
[8]葛本伟,刘安娜.天山北麓黄土剖面的光释光测年分析[J].干旱区研究,2016,33(04):869-876.
[9]葛本伟,黄春长,周亚利,庞奖励,查小春.龙山文化末期泾河特大洪水事件光释光测年研究[J].第四纪研究,2010,30(02):422-429.
[10]陈淑娥,李虎侯,庞奖励.释光测年的研究简史及研究现状[J].西北大学学报(自然科学版),2003(02):209-212.
[11]贾耀锋.释光测年的主要问题及其理论探讨[J].核电子学与探测技术,2010,30(06):812-816.
[2]张克旗,吴中海,吕同艳,冯卉.光释光测年法——综述及进展[J].地质通报,2015,34(01):183-203.
[3]D.J.Huntley,et al.:1985,Nature,V313,105-107.
[4]Aitken,M.J.:1985,Thermoluminescence Dating,Academic Press,London.
[5]Hutt,G.,et al.:1988,Quaternary Science Review,V.7,381-385.
[6]卢演俦.沉积物的光释光(OSL)测年简介[J].地质地球化学,1990(01):36-40.
[7]贾耀锋,黄春长,庞奖励,毛龙江,葛本伟.渭河流域东部全新世黄土-古土壤剖面光释光测年及其记录的土壤侵蚀事件[J].海洋地质与第四纪地质,2008(03):73-83.
[8]葛本伟,刘安娜.天山北麓黄土剖面的光释光测年分析[J].干旱区研究,2016,33(04):869-876.
[9]葛本伟,黄春长,周亚利,庞奖励,查小春.龙山文化末期泾河特大洪水事件光释光测年研究[J].第四纪研究,2010,30(02):422-429.
[10]陈淑娥,李虎侯,庞奖励.释光测年的研究简史及研究现状[J].西北大学学报(自然科学版),2003(02):209-212.
[11]贾耀锋.释光测年的主要问题及其理论探讨[J].核电子学与探测技术,2010,30(06):812-816.