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RISS 인기검색어
- 검색키워드
- 저자 : Jull, A.J.T (검색결과 6 건)
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Radiocarbon Dating of the Mansuri Paleolithic Site, Cheongwon, Korea
Kim, K J,Jull, A J T,Yong Kim, Ju,Jo Lee, Yung,Hong, Wan,Hun Park, Jung,Joo Woo, Hyung Cambridge University Press 2010 RADIOCARBON Vol.52 No.4
<P>Construction of a new science complex in Osong, Cheongwon-gun, Korea, has allowed the investigation of 14 different Paleolithic localities, excavated during 2005-2007. Here, we investigated localities 1 and 12 of the Mansuri Paleolithic site to obtain chronological information using radiocarbon dating. The soil deposition rates varied from 0.09 to 0.15 mm/yr over the period ranging from 33 to 31 kyr BP for locality 1. Locality 12 samples were more recent, <10 ka, and have similar accumulation rates, averaging 0.11 mm/yr. The soil ages of locality 12 were found to be younger than 10 kyr BP. Results for both soil and organic materials at this locality gave much younger ages at shallower depths than the ages expected by the Korean Paleolithic cultural history for this region. Therefore, these more recent deposits may not be associated with the cultural layers and are interpreted to have been hydrologically modified following emplacement. <SUP>14</SUP>C dates of the soil and organic materials at locality 12 confirm that there is evidence for multiple human occupations throughout the last 9 kyr BP.</P>
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Park, J S,Burr, G S,Jull, A J T Cambridge University Press 2010 RADIOCARBON Vol.52 No.3
<P>A method of thermal and acid treatments was developed at the Archaeo-metallurgy Laboratory of Hongik University in Korea to extract carbon from cast iron, and carbon objects thus prepared from cast iron artifacts of ancient Korea were dated at the University of Arizona's AMS Facility. The thermal treatments consist of heating a specimen to ∼1000 °C in a controlled environment with reduced oxygen potential, then cooling it rapidly to room temperature. The heating causes the cementite phase in white cast iron to be graphitized and the quenching suppresses pearlite formation. The specimen then consists of flakes of graphite embedded in a matrix of martensite. The next stage of the treatment is to dissolve the martensite matrix in a solution of nitric and hydrochloric acids to release the graphite as a powder. This material is then cleaned, dried, and pressed into target holders for accelerator mass spectrometry (AMS) analysis. The method was applied to a collection of artifacts from the Korean Three Kingdoms period (about AD 300-668) and the AMS results were compared with chronological estimates from other means.</P>
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장반감기 우주선유발 동위원소, $^{10}Be$과 그 응용
김경자,우형주,Kim, K.J.,Jull, A.J.T,Woo, H.J. 한국제4기학회 2006 제사기학회지 Vol.20 No.2
반감기가 긴 $^{10}Be$ (Beryllium-10)은 지구의 대기뿐만 아니라, 지구의 표면 그리고 다른 행성의 대기와 표면에서도 생성된다. 가속기질량분석기술(AMS)이 1970년 후반기에 개발되면서 지질분야 연구에서 매우 중요한 추적자 중의 하나인 $^{10}Be$ 측정이 가능해졌으며, 이후 지구와 지구외 시료를 이용한 다양한 $^{10}Be$ 응용연구가 방사성탄소 응용연구와 함께 이루어져 왔다. 본 논문은 지구와 행성의 대기와 표면에서의 $^{10}Be$ 생성에 관한 메카니즘과 지형학, 해양학, 고고학, 빙하학, 우주방사화학, 기후학, 그리고 행성학 등의 여러 학문 분야에서의 $^{10}Be$의 응용연구들에 대하여 정리하였으며, 아울러 $^{10}Be$ 가속기질량분석을 이용한 향후 연구과제들을 고찰하였다. The long-lived radionuclide, $^{10}Be$, is produced by cosmic-ray effects in the atmosphere of the earth as well as its surface and that of other planetary surfaces and atmospheres. Accelerator mass spectrometry (AMS) was developed in late 1970s, which made $^{10}Be$ terrestrial measurements more feasible. Since then, many research applications of $^{10}Be$ for both terrestrial and extraterrestrial applications have been developed, which parallel the wide range of radiocarbon ($^{14}C$) research applications. This paper summarizes production mechanisms of $^{10}Be$ both in the atmosphere and on the surface of terrestrial and extraterrestrial environments and also provides numerous $^{10}Be$ research applications in the fields of geomorphology, oceanography, archaeology, glaciology, cosmochemistry, climatology, and planetary science. We also review some $^{10}Be$ AMS research applications.
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Development of Radiocarbon Dating Method for Degraded Bone Samples from Korean Archaeological Sites
Kim, K J,Hong, W,Park, J H,Woo, H J,Hodgins, G,Jull, A J T,Lee, Y J,Kim, J Y Cambridge University Press 2011 Radiocarbon Vol.53 No.1
<P>The development of radiocarbon dating for degraded bone samples collected at Korean archaeological sites has been successful through the characterization of raw bone C/N ratios and application of an ultrafiltration method. It was found that the C/N ratios of raw bone samples are inversely proportional to the carbon content and residue amount after gelatinization. We have examined a few dozen Korean archaeological bone samples for this study. Well-preserved bone samples are found to be physically dense. The range of C/N ratios of Korean raw bone samples ranged from 3.4 to 74. We found that the C/N ratios of degraded raw bone samples can be used to determine whether <SUP>14</SUP>C samples are acceptable for normal pretreatment processing and eventual dating. The results of this study support that even if the C/N ratio of a degraded raw bone sample is 11, extraction of collagen for bone dating is feasible by a carefully designed ultrafiltration process. Our preliminary <SUP>14</SUP>C dating results of a depth profile of Gunang-gul Cave, an archaeological site in Danyang, Korea, indicate that this site has been either geologically or anthropologically disturbed in the past, with <SUP>14</SUP>C ages ranging from 28,910 ± 200 to 48,090 ± 1050 yr BP. The C/N ratios of the collagen samples of Gunang-gul were determined to be 3.2-3.6. Our study establishes a new guide for the pretreatment of degraded bone samples such as those collected in Korea for <SUP>14</SUP>C dating.</P>
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Development of Radiocarbon Dating Methods for Modern Bone Collagenization
Kim, K J,Hong, W,Park, J H,Woo, H J,Hodgins, G,Jull, A J T Cambridge University Press 2010 RADIOCARBON Vol.52 No.4
<P>The relationship between temperature and time required for collagenization using modern bone samples was investigated. Gelatinized samples of bone collagen were filtered to selectively collect different molecular weight fractions. The results of this study suggest that heating to 70 ° for a duration of 12 hr provides the optimal conditions for gelatinization.</P>
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