• Title, Summary, Keyword: OSL dating

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Applications of OSL method in Archeology (OSL 연대측정법의 고고학적 적용)

  • Yang, Dong-Yoon;Kim, Ju-Yong;Shin, Sook-Chung
    • The Korean Journal of Quaternary Research
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    • v.20 no.1
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    • pp.28-38
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    • 2006
  • Since the radioactivity of U was discovered by Becquerel in 1896, a number of radiometric dating techniques based on radioactive decay have been developed with the help of precise and accurate instruments. Among them, radiocarbon dating was introduced as the most effective method in archeology in Korea. However, though the radiocarbon methods have contributed greatly to the development of archeology in Korea, it is limited to organics in a matrix of soil and sediment, including organic carbon, charcoal, bone and so on. If there are no organics in some paleolitic sites, other methods are required for dating. Therefore, we introduced OSL (Optically Stimulated Luminescence) dating method in this paper. The method is mainly based on quartz grains or other particles. The aim of this paper is to discuss about sampling method and the limitation of its application in archeology.

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Revisiting the OSL Ages of Marine Terrace Sediments at Suryum Fault Site, Gyeongju, South Korea: Single Grain OSL Dating (수렴단층노두 해안단구 퇴적층의 OSL 연대에 대한 재고찰: 단일입자 OSL 연대측정 연구)

  • Heo, Seoyoung;Choi, Jeong-Heon;Hong, Duk-Geun
    • The Journal of the Petrological Society of Korea
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    • v.23 no.3
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    • pp.187-195
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    • 2014
  • In this paper, we report new OSL ages of the marine terrace sediments at Suryum fault site, using single grains of quartz, and briefly discuss their chronological implications on the timing of terrace formation along the southeastern coast of Korea. Of 1200 grains measured, 93 quartz grains were found to have OSL properties suitable for dating, the equivalent dose ($D_e$) values of which varied significantly, ranging from 50 Gy to 610 Gy with the overdispersion of $30{\pm}4%$. Applied to the Central Age Model (CAM) and Minimum Age Model (MAM), these quartz grains showed the OSL ages of $83{\pm}4ka$ and $60^{+3}{_{-7}}ka$, respectively, both of which are stratigraphically inconsistent with the previously reported OSL ages of lower $2^{nd}$ terrace (MIS 5a; ~80 ka). However, Finite Mixture Model (FMM) revealed that a small fraction of the measured quartz grains ($6{\pm}4%$) were of the ages ($194{\pm}24ka$) corresponding to MIS 7. Conclusively, based on single grain OSL ages, it would be prudent not to exclude the possibility that the marine terrace sediments at Suryum fault site have formed during MIS 7. Further, our single grain OSL ages imply that multiple grain(single aliquot) OSL dating methods are not applicable to the marine sediments at Suryum fault site.

Trace Element Compositions and Optically Stimulated Luminescence Characteristics of Sedimentary Quartz (퇴적물 내 석영의 광여기 루미네선스 특성과 미량원소 조성)

  • Jeon, Gi-Young;Choi, Jeong-Heon;Kil, Young-Woo
    • Journal of the Mineralogical Society of Korea
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    • v.23 no.4
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    • pp.357-365
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    • 2010
  • Optically stimulated luminescence (OSL) of quartz is commonly applied to the age dating of Quaternary sediments. However, one of the issues is that some of the quartz samples are not suitable to OSL dating. Mineralogical analysis of the quartz samples with diverse OSL signals are required to strengthen the reliability and applicability of the OSL dating. We analysed the OSL signal characteristics of sedimentary quartz samples from diverse geological environments and measured their trace element contents using laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Quartz samples could be grouped into ones suitable to OSL dating and ones unsuitable on the basis of their OSL signal characteristics. The average trace element contents ranged from 73 to 260 ppm (Al), and from 61 to 248 ppm (Ti) with minor Li, Mg, Cr, Mn, and Fe contents below 40 ppm. We did not find any significant variation of trace element contents of quartz samples consistent with their OSL signal characteristics. This indicates unknown mineralogical factors causing diverse OSL characteristics which should be confirmed by further analysis of sufficient set of samples.

Optical dating of Quaternary sediment (광 여기 루미네센스를 이용한 신기 퇴적층의 연대측정)

  • 홍덕균;최정헌;한정희;최만식;정창식
    • The Journal of the Petrological Society of Korea
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    • v.10 no.3
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    • pp.202-211
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    • 2001
  • Luminescence is a physical phenomenon exhibited by many non-conducting, crystalline materials, such as quartz and feldspar. Within the crystals, energy absorbed from ionising radiation frees electrons to move through the crystal lattice and some are trapped at defects in the lattice. Observable luminescence is produced by electrons, released from traps by stimulation by absorption of light, which recombine with lattice defects which act as luminescence centers - optically stimulated luminescence (OSL). In a similar way to thermoluminescence(TL) dating, controlled measurement of the OSL signal can provide a means of determining the time since the last exposure of a layer of sediment to sunlight, the age of the sediment. However, whereas in the thermoluminescence dating of sediment only part of the latent thermoluminescence signal is bleached by sunlight as the sediment is deposited and allowance must be made during the laboratory measurements for the light insensitive component, optically induced luminescence dating has the advantage of working only with light sensitive traps in the crystal. Determination of the time since deposition of Quaternary sediment samples from the OSL of quartz grains using blue light was performed. A series of experiments and recent developments relating OSL dating are described, beginning by identifying the features which make OSL signals suitable for the development of dating method. Additionally, there are suggestions as to future research for obtaining reliable ages and a comment on current best practice on procedures, with the dating results of Quaternary sediment.

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The Development of Earthenware Kilns in Bongsan-ri Archaeological Site, Osong: Implications for Pre- and Post-1950 AD Absolute Age Determination (AD 1950년 전후 고고유적의 절대연대측정에 대한 고찰: 오송 봉산리 옹기가마 유적을 중심으로)

  • Kim, Myung Jin;Son, Myoung Soo;Kim, Tae Hong;Sung, Ki Seok
    • Journal of Conservation Science
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    • v.34 no.6
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    • pp.481-492
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    • 2018
  • We conducted TL/OSL dating for the earthenware kilns in the Bongsan-ri archaeological site, Osong, which was occupied from the late nineteenth to the late twentieth century. With the SAR-TL/OSL method, paleodose was determined from the equivalent dose during the burial period($ED_{burial}$), the background dose($ED_{BG}$), the fading correction factor(f), and the overestimation correction factor(C). The annual dose rates and their provenance were evaluated from the measurement of natural radionuclides $^{238}U$, $^{232}Th$, and $^{40}K$. Because the comprehensive absolute age was provided by combining the resulting TL/OSL and radiocarbon data, we concluded that, for the absolute chronology of a modern archaeological site, TL/OSL dating and radiocarbon dating must be carried out together and summed. The construction and occupation of earthenware kilns in the Bongsan-ri site had changed from stage I (No.5, 6 kilns), to stage II (No.1, 2, 3 kilns), to stage III (No.4) in chronological order. When Bayesian statistics were applied, we found that the absolute ages of occupation for stages I, II, and III correspond to AD $1910{\pm}23$, AD $1970{\pm}10$, and AD $1987{\pm}4$. These results were in good agreement with the archaeological context or chronology.

Evaluation of the formation and occupation of Gosan-ri archaeological site in Jeju Island using OSL dating (OSL 연대측정을 통한 제주 고산리 유적의 형성과 점유시기 결정)

  • Kim, Myung-Jin
    • Analytical Science and Technology
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    • v.29 no.6
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    • pp.269-276
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    • 2016
  • Gosan-ri site is known as the early Neolithic cultural heritage, in which an archaic plainware, called as the Gosan-ri-type pottery, was excavated regarding as the first pottery manufactured in Korea. In this study, OSL dating was carried out to five soil layer samples collected in stratigraphic cross-section for evaluating the formation and occupation of the Gosan-ri site. Paleodose of each soil sample was calculated using the single aliquot regenerative dose (SAR) method with preheat of $220^{\circ}C$ and finally determined using maximum age model, considering its deposition process. The OSL age was determined from the ratio of paleodose to annual dose rate. From the resultant OSL ages and the related 14C dates, it was concluded that the Gosan-ri site was formed after 9,000 BC and a variety of cultural feature including the Gosan-ri-type pottery were occupied ranging from the early Neolithic to the middle of 4,000 BC. Finally, the Gosan-ri site was discarded in the middle of 4,000 BC and has been arrived at present through natural deposits.

OSL Age Determination of the Hearths in a Bronze Age Dwelling Site by using Bayesian Statistics (베이지안 통계학을 이용한 청동기시대 주거지내 화덕자리들의 광자극발광(OSL) 연대 결정)

  • Kim, Myung-Jin;Yang, Hye-Jin;Hong, Duk-Geun
    • Journal of Radiation Protection and Research
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    • v.36 no.2
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    • pp.52-58
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    • 2011
  • OSL dating for three hearths having the sequence of use and discard in No. 29 and 29-1 dwelling sites at Sogol cultural site was carried out. Resulting from the deconvolution of natural CW-OSL decay curve and thermal zeroing test, it was turned out that OSL signal was entirely composed of the heat- and light-sensitive fast component with high photoionization cross-section and all quartz OSL signals were thermally bleached under $300^{\circ}C$ which is the minimum temperature related to heating and cooking in Bronze age. After dose recovery test and plateau test, paleodose of each hearth sample was evaluated by using SAR method, and OSL age was determined from the ratio of paleodose to annual dose rate. For the purpose of the precision improvement of OSL age, Bayesian statistics was applied to each hearth's age and the archaeological sequence information. Finally, it could be concluded to the accurate use period of each hearth from the resultant OSL ages.

The Processes of Coastal Dunes and its Geomorphological Characteristics, Ui-island, Shinan-gun, Korea (우이도 해안사구의 지형특성과 형성과정)

  • Shin, Won Jeong;Kim, Jong Wook;Kim, Jong Yeon;Choi, Jeong-Heon
    • Journal of The Geomorphological Association of Korea
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    • v.24 no.2
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    • pp.1-13
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    • 2017
  • Massive coastal sand dunes are distributed in Ui-island, Shinan-gun. The sand dunes in Ui-island is worth studying, in terms of preserving natural environment without anthropogenic impacts. In this study, we surveyed geomorphological processes of the sand dune based upon measuring of geometric properties, grain size analysis, and OSL(Optically Stimulated Luminescence) age dating. The sediments of the dune consist mainly of well sorted medium sand with about 250$\mu$m. Based on spatial distribution of sand dunes, we found that they are formed by northwest monsoon during winter, and sands are supplied from Seongchon area in northern UI-island. According to OSL age dating, the sand dunes were deposited from $0.07{\pm}0.01ka$ to $0.17{\pm}0.04ka$. This result shows that the transformation of the dune due to the sand movement by wind was active during the last 100-200 years. The aerial photograph indicates that the dimension of the largest sand dune has decreased since 1945. Further research is needed to get more detailed information on geomorphic changes of sand dunes in UI-island.

Evaluation of construction era of Pungnabtoseong earthen wall, Seoul by using OSL dating (OSL 연대측정을 통한 풍납토성 축조연대 산출)

  • Kim, Myung-Jin
    • Analytical Science and Technology
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    • v.25 no.5
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    • pp.324-332
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    • 2012
  • Construction era of Pungnabtoseong earthen wall is one of the most popular controversial issues in Korean archaeological research. For the evaluation of construction era, OSL dating was carried out using seven pottery pieces collected in each construction stage. From TL/OSL characteristics, and the results of absolute zeroing test and recovery test, it was proved that the pottery samples were completely bleached. The reliable paleodose was evaluated by using the SAR method with preheat at $220^{\circ}C$, and the pottery OSL age was determined from the ratio of paleodose to annual dose rate. Considering the resultant OSL ages, archaeological context and the related 14C ages, the first construction era was determined as $294{\pm}52$ yrs AD ($1{\sigma}$ SE). Also we found that the enlargement of construction stage III was $328{\pm}30$ yrs AD ($1{\sigma}$ SE) and final construction was finished within $400{\pm}76$ yrs AD ($1{\sigma}$ SE). Therefore, it is suggested that the construction of Pungnabtoseong earthen wall was firstly started in the late $3^{rd}$ century AD and several enlargements and repairs had been carried out, before the transfer of the capital of Baekje dynasty to Woongjin (Gongju) at 475 AD.

Age comparisons of coastal sand dune stratum in Chollipo, Korea by altering preheat and cut-heat, and grain size distributions by OSL dating (예열 및 cut-heat 온도와 입자의 크기에 따른 천리포 해안사구 퇴적층의 OSL 연대측정 비교)

  • Bang, Jun-Hwan;Kim, Ki-Dong;Eum, Chul-Hun
    • Analytical Science and Technology
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    • v.22 no.1
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    • pp.51-56
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    • 2009
  • The samples from coastal sand dune stratum in Chollipo were dated by Optically Stimulated Luminescence (OSL) with modified Single Aliquots Regeneration (SAR) method. It is possible to choose the OSL signals by thermal treatments such as preheat and cut-heat in SAR procedure. Preheat and cut-heat of $260^{\circ}C$ for 10 sec $-220^{\circ}C$ for 0 sec, and $270^{\circ}C$ for 10 sec $-270^{\circ}C$ for 10 sec were applied for estimation of equivalent dose of the samples. The OSL signals from different thermal treatment were used for OSL dating. Equivalent dose were estimated with 4 fractionated grain distributions with $75{\mu}m$, $150{\mu}m$ and $200{\mu}m$ sieves with above heating treatments. Consequently, the estimated dose were differently valued in sample sizes and applied heating treatments, different stratum ages were calculated. The ages from radiocarbon dating were compared with the OSL ages. The ages varying with grain sizes produce that the site sampled were formed with mixed soil sources.