Relative methods, which are performed with the assistance of reference materials, are widely used in photon activation analysis(PAA). On the contrary, absolute methods, which are conducted without any reference materi...Relative methods, which are performed with the assistance of reference materials, are widely used in photon activation analysis(PAA). On the contrary, absolute methods, which are conducted without any reference material, are rarely applied due to the difficulty in obtaining photon flux. To realize absolute measurement in PAA,we retrieve photon flux in the sample via Monte Carlo simulation and raise a novel procedure—quasi-absolute method. With simulated photon flux and cross section data from existing databases, it is possible to calculate the concentration of target elements in the sample straightforwardly. A controlled experiment indicates that results from the quasi-absolute method for certain elements are nearly comparable to relative methods in practice.This technique of absolute measurement has room for improvement in the future and can serve as a validation technique for experimental data on cross sections as well.展开更多
The large-mouthed zun vase is an important pottery vessel type in the Dawenkou culture. Inquiry into its producing areas contributes greatly to the revelation of the cultural relationship among the relevant sites and ...The large-mouthed zun vase is an important pottery vessel type in the Dawenkou culture. Inquiry into its producing areas contributes greatly to the revelation of the cultural relationship among the relevant sites and to the clarification of the origin and spreading lines of this vessel. By using the ICP, petrography and Fisher analyses, the large-mouthed pottery zun vases of the Dawenkou culture unearthed from the Yuchisi site in Mengeheng of Anhui and from the Zhoujiazhuang and Dazhujiacun sites in Juxian county of Shandong have been preliminarily studied as to their producing areas and cultural source. The results show that the large-mouthed vases from Shandong Juxian are locally produced, while those from the Yuchisi site involve rather a vast region concerning their production, and some of them are similar to the specimens from Juxian, which suggests certain cultural linkage between the two areas.展开更多
基金Supported by the U.S.Department of Energy,Basic Energy Sciences,Office of Science(No.DE-AC02-06CH11357)
文摘Relative methods, which are performed with the assistance of reference materials, are widely used in photon activation analysis(PAA). On the contrary, absolute methods, which are conducted without any reference material, are rarely applied due to the difficulty in obtaining photon flux. To realize absolute measurement in PAA,we retrieve photon flux in the sample via Monte Carlo simulation and raise a novel procedure—quasi-absolute method. With simulated photon flux and cross section data from existing databases, it is possible to calculate the concentration of target elements in the sample straightforwardly. A controlled experiment indicates that results from the quasi-absolute method for certain elements are nearly comparable to relative methods in practice.This technique of absolute measurement has room for improvement in the future and can serve as a validation technique for experimental data on cross sections as well.
文摘The large-mouthed zun vase is an important pottery vessel type in the Dawenkou culture. Inquiry into its producing areas contributes greatly to the revelation of the cultural relationship among the relevant sites and to the clarification of the origin and spreading lines of this vessel. By using the ICP, petrography and Fisher analyses, the large-mouthed pottery zun vases of the Dawenkou culture unearthed from the Yuchisi site in Mengeheng of Anhui and from the Zhoujiazhuang and Dazhujiacun sites in Juxian county of Shandong have been preliminarily studied as to their producing areas and cultural source. The results show that the large-mouthed vases from Shandong Juxian are locally produced, while those from the Yuchisi site involve rather a vast region concerning their production, and some of them are similar to the specimens from Juxian, which suggests certain cultural linkage between the two areas.
