Junghun Park
Biographic Data
| ID | 5152525 |
|---|---|
| NAME | Junghun Park |
| GIVEN NAMES | Junghun |
| FAMILY NAME | Park |
| SIGNATURE | PARK J |
| AFFILIATIONS | Korea Institute of Geoscience and Mineral Resources |
| ORCID | 0000-0002-8613-4418 |
| VERIFIED | Yes |
| TOTAL WORKS | 20 |
| TOTAL CITATIONS | 62 |
| AUTHOR COUNT | 20 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1999 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 4 |
Early 14 C increase in high-latitude trees at 665–664 BC
The discovery of radiocarbon ( 14 C) peaks in AD 774–775 and AD 993–994 sparked the search for other anomalous events, leading to the identification of one around 660 BC. However, the ∼660 BC event appears to show a more prolonged increase, raising the question whether the event is qualitatively different. To investigate this, we measured high-latitude tree rings from Finnish Lapland, expected to be highly sensitive to energetic particle events. …
Δ 14 C Peaks Appearing in Earlywood and Latewood Tree Rings (Ad 770–780) in Northeastern Arizona
The AD 775 peak in Δ 14 C (henceforth, M12) was first measured by Miyake et al. and has since been confirmed globally. Here we present earlywood and latewood Δ 14 C values from tree rings of pinyon pine ( Pinus edulis ) from Mummy Cave, Canyon de Chelly National Monument, Chinle, Arizona, USA, for the period AD 770–780. These data reconfirm the timing of M12 and show a small rise in Δ 14 C in AD 774 latewood. Allowing for the delay in lateral tra…
Estimation of the Occurrence Time of the Δ 14 C Peak in Ad 775 Based on the Oxidation Time of 14 C in the Atmosphere and Δ 14 C Values in Subannual Tree Rings
The 14 C peak in AD 775 (M12) has been measured and confirmed globally in several studies since it was first measured in annual tree rings by Miyake et al. (2012). However, M12 data measurements in early- and latewood are limited. This paper presents the Δ 14 C values in early- and latewood from AD 762–776 Zelkova serrata tree rings from Bangu-dong, Ulsan, South Korea (35°33′N, 129°20′E). The results indicate no early rise in Δ 14 C values in the…
Single-Year German oak and Californian Bristlecone Pine 14 C Data at the Beginning of the Hallstatt Plateau from 856 BC to 626 BC
As part of the ongoing effort to improve the Northern Hemisphere radiocarbon ( 14 C) calibration curve, this study investigates the period of 856 BC to 626 BC (2805–2575 yr BP) with a total of 403 single-year 14 C measurements. In this age range, IntCal13 was constructed largely from German and Irish oak as well as Californian bristlecone pine 14 C dates, with most samples measured with a 10-yr resolution. The new data presented here is the first…
Radiocarbon age offsets of Plants and Bioclasts in the Holocene Sediments from the Miyazaki Plain, Southeast Coast of Kyushu, Southwest Japan
To investigate the relationship between paleoenvironmental changes and marine reservoir effects, the radiocarbon ages of marine bioclasts and terrestrial plants from the same horizons of a sediment core in the Holocene Epoch were measured. This core, with a length of approximately 9 m, was obtained from the southern part of the Miyazaki Plain southeast of Kyushu Island, which faces the Kuroshio warm current. This drilling site is located in an up…
Relationship between solar activity and Δ 14 C peaks in AD 775, AD 994, and 660 BC
Since the AD 775 and AD 994 Δ 14 C peak (henceforth M12) was first measured by Miyake et al. (2012, 2013), several possible production mechanisms for these spike have been suggested, but the work of Mekhaldi et al. (2015) shows that a very soft energy spectrum was involved, implying that a strong solar energetic particle (SEP) event (or series of events) was responsible. Here we present Δ 14 C values from AD 721–820 Sequoiadendron giganteum annua…
C/ 12 C Variations of Samples Exposed in Air According to Carbon Structure and Air Temperature
Various carbon structures, including carbon nanofilament (CNF), single-wall carbon nanotube (SWCNT), multi-wall carbon nanotube (MWCNT), and pyrolytic graphite sheet (PGS), were exposed in air to determine how they vary according to carbon structure and air temperature. CNF is the carbon structure used in accelerator mass spectrometry (AMS) radiocarbon dating (Santos et al. 2007). When CNF and MWCNT were exposed in cold air (3 or −18 °C) for long…
A Comparison of Distribution Maps of Δ14C of 2010 and 2011 in Korea
Δ14C values of leaves of deciduous trees provide a means to map the regional-scale fossil fuel ratio in the atmosphere. We collected a batch of ginkgo (Ginkgo biloba Linnaeus, a deciduous tree) leaf samples from across Korea in the month of July in both 2010 and 2011 to obtain the regional distribution of Δ14C. The Δ14C values of the samples were measured using accelerator mass spectrometry (AMS) at the Korea Institute of Geoscience and Mineral R…
C/12C Variations of Samples Exposed in Air According to Carbon Structure and Air Temperature
Various carbon structures, including carbon nanofilament (CNF), single-wall carbon nanotube (SWCNT), multi-wall carbon nanotube (MWCNT), and pyrolytic graphite sheet (PGS), were exposed in air to determine how they vary according to carbon structure and air temperature. CNF is the carbon structure used in accelerator mass spectrometry (AMS) radiocarbon dating (Santos et al. 2007). When CNF and MWCNT were exposed in cold air (3 or −18 °C) for long…
A Comparison of Distribution Maps of Δ 14 C in 2010 and 2011 in Korea
Δ 14 C values of leaves of deciduous trees provide a means to map the regional-scale fossil fuel ratio in the atmosphere. We collected a batch of ginkgo (Ginkgo biloba Linnaeus , a deciduous tree) leaf samples from across Korea in the month of July in both 2010 and 2011 to obtain the regional distribution of Δ 14 C. The Δ 14 C values of the samples were measured using accelerator mass spectrometry (AMS) at the Korea Institute of Geoscience and Mi…
Development of Radiocarbon Dating Method for Degraded Bone Samples from Korean Archaeological Sites
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…
Development of Radiocarbon Dating Methods for Modern Bone Collagenization
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
Simple Pretreatment Method Development for Iron and Calcium Carbonate Samples
Since iron artifacts generally contain trace amounts of carbon, an iron sample needs to be relatively large, as compared to other materials, and a specially designed combustion system is required. An elemental analyzer (EA) was used for the combustion of iron without any special chemical treatment. CO 2 gas with 1 mg of carbon was obtained from the combustion of an iron artifact by using an EA and reduced to graphite for accelerator mass spectrom…
Seoul National University Accelerator Mass Spectrometry (SNU-AMS) Radiocarbon Date List II
The accelerator mass spectrometry facility at Seoul National University (SNU-AMS) began functioning in December 1998 and was first reported at the Vienna AMS conference in October 1999 and at the 17th Radiocarbon Conference in Israel in June 2000. At the Vienna conference, we reported our accelerator system (Kim et al. 2000) and the basic sample preparation system (Lee et al. 2000), including the combustion line to produce CO 2 ; the catalytic re…
Seoul National University Accelerator Mass Spectrometry (SNU-AMS) Radiocarbon Date List I
The accelerator mass spectrometry facility at Seoul National University (SNU-AMS) began functioning in December 1998 and was first reported at the Vienna AMS conference in October 1999 and at the 17th International Radiocarbon Conference in Israel in June 2000. At the Vienna conference, we reported our accelerator system (Kim et al. 2000) and details of the basic sample preparation system (Lee et al. 2000), such as the combustion line to produce …
Development of a Combustion System for Liquid or Gas Samples
While it is customary to use solid samples for measuring the 14 C/ 12 C ratio, it is sometimes necessary to handle liquid or gas samples. Motivated by a scientific purpose to count radiocarbon yields in deuterated acetone irradiated with energetic neutrons, we developed a new combustion system to treat liquid or gas samples. In contrast with the typical combustion system using CuO for solid samples, the new combustion system uses high-purity O 2 …
C Level At Mt Chiak and Mt Kyeryong in Korea
We have observed A 14 C concentrations in the northern hemisphere temperate region in the bomb pulse period, using cross-dated tree ring samples. The tree-ring samples were taken from one 70-year-old and two 50-year-old red pines ( Pinus densiflora ) on Mt Chiak, Korea and from a 50-year-old red pine ( Pinus densiflora ) on Mt Kyeryong, Korea. Twenty-two tree-ring samples from four red pines ranging from 1950 to 2000 AD were pretreated to obtain …
Pretreatment of Iron Artifacts at SNU-AMS
We present the current status of accelerator mass spectrometry (AMS) dating of iron artifacts at Seoul National University (SNU). In ancient iron production, charcoal was widely used as carbon for the smelting process, whereas coal is used in modern times. If reliable data could be obtained from carbon by using AMS, ancient iron artifacts could be traced to their production age. In normal acid treatment, it is not easy to extract carbon due to it…
Progress at the Seoul National University AMS Facility
The accelerator mass spectrometry facility at the Seoul National University (SNU-AMS) was completed in December 1998 and a report was presented at the Vienna AMS conference in September 1999. At the conference, we described the basic components of our accelerator system and reported the results of the performance test. Since then, extensive testing of the accuracy and reproducibility of the system has been carried out, and about 200 unknown sampl…
Effect of Cryptotympana atrata extract on compound 48/80-induced anaphylactic reactions
Relationship between solar activity and Δ 14 C peaks in AD 775, AD 994, and 660 BC
Since the AD 775 and AD 994 Δ 14 C peak (henceforth M12) was first measured by Miyake et al. (2012, 2013), several possible production mechanisms for these spike have been suggested, but the work of Mekhaldi et al. (2015) shows that a very soft energy spectrum was involved, implying that a strong solar energetic particle (SEP) event (or series of events) was responsible. Here we present Δ 14 C values from AD 721–820 Sequoiadendron giganteum annua…
C Level At Mt Chiak and Mt Kyeryong in Korea
We have observed A 14 C concentrations in the northern hemisphere temperate region in the bomb pulse period, using cross-dated tree ring samples. The tree-ring samples were taken from one 70-year-old and two 50-year-old red pines ( Pinus densiflora ) on Mt Chiak, Korea and from a 50-year-old red pine ( Pinus densiflora ) on Mt Kyeryong, Korea. Twenty-two tree-ring samples from four red pines ranging from 1950 to 2000 AD were pretreated to obtain …
Single-Year German oak and Californian Bristlecone Pine 14 C Data at the Beginning of the Hallstatt Plateau from 856 BC to 626 BC
As part of the ongoing effort to improve the Northern Hemisphere radiocarbon ( 14 C) calibration curve, this study investigates the period of 856 BC to 626 BC (2805–2575 yr BP) with a total of 403 single-year 14 C measurements. In this age range, IntCal13 was constructed largely from German and Irish oak as well as Californian bristlecone pine 14 C dates, with most samples measured with a 10-yr resolution. The new data presented here is the first…
Progress at the Seoul National University AMS Facility
The accelerator mass spectrometry facility at the Seoul National University (SNU-AMS) was completed in December 1998 and a report was presented at the Vienna AMS conference in September 1999. At the conference, we described the basic components of our accelerator system and reported the results of the performance test. Since then, extensive testing of the accuracy and reproducibility of the system has been carried out, and about 200 unknown sampl…
Development of Radiocarbon Dating Method for Degraded Bone Samples from Korean Archaeological Sites
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…
Simple Pretreatment Method Development for Iron and Calcium Carbonate Samples
Since iron artifacts generally contain trace amounts of carbon, an iron sample needs to be relatively large, as compared to other materials, and a specially designed combustion system is required. An elemental analyzer (EA) was used for the combustion of iron without any special chemical treatment. CO 2 gas with 1 mg of carbon was obtained from the combustion of an iron artifact by using an EA and reduced to graphite for accelerator mass spectrom…
Pretreatment of Iron Artifacts at SNU-AMS
We present the current status of accelerator mass spectrometry (AMS) dating of iron artifacts at Seoul National University (SNU). In ancient iron production, charcoal was widely used as carbon for the smelting process, whereas coal is used in modern times. If reliable data could be obtained from carbon by using AMS, ancient iron artifacts could be traced to their production age. In normal acid treatment, it is not easy to extract carbon due to it…
Estimation of the Occurrence Time of the Δ 14 C Peak in Ad 775 Based on the Oxidation Time of 14 C in the Atmosphere and Δ 14 C Values in Subannual Tree Rings
The 14 C peak in AD 775 (M12) has been measured and confirmed globally in several studies since it was first measured in annual tree rings by Miyake et al. (2012). However, M12 data measurements in early- and latewood are limited. This paper presents the Δ 14 C values in early- and latewood from AD 762–776 Zelkova serrata tree rings from Bangu-dong, Ulsan, South Korea (35°33′N, 129°20′E). The results indicate no early rise in Δ 14 C values in the…
A Comparison of Distribution Maps of Δ 14 C in 2010 and 2011 in Korea
Δ 14 C values of leaves of deciduous trees provide a means to map the regional-scale fossil fuel ratio in the atmosphere. We collected a batch of ginkgo (Ginkgo biloba Linnaeus , a deciduous tree) leaf samples from across Korea in the month of July in both 2010 and 2011 to obtain the regional distribution of Δ 14 C. The Δ 14 C values of the samples were measured using accelerator mass spectrometry (AMS) at the Korea Institute of Geoscience and Mi…
Development of Radiocarbon Dating Methods for Modern Bone Collagenization
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
Seoul National University Accelerator Mass Spectrometry (SNU-AMS) Radiocarbon Date List I
The accelerator mass spectrometry facility at Seoul National University (SNU-AMS) began functioning in December 1998 and was first reported at the Vienna AMS conference in October 1999 and at the 17th International Radiocarbon Conference in Israel in June 2000. At the Vienna conference, we reported our accelerator system (Kim et al. 2000) and details of the basic sample preparation system (Lee et al. 2000), such as the combustion line to produce …
Effect of Cryptotympana atrata extract on compound 48/80-induced anaphylactic reactions
Pretreatment of Iron Artifacts at SNU-AMS
We present the current status of accelerator mass spectrometry (AMS) dating of iron artifacts at Seoul National University (SNU). In ancient iron production, charcoal was widely used as carbon for the smelting process, whereas coal is used in modern times. If reliable data could be obtained from carbon by using AMS, ancient iron artifacts could be traced to their production age. In normal acid treatment, it is not easy to extract carbon due to it…
Progress at the Seoul National University AMS Facility
The accelerator mass spectrometry facility at the Seoul National University (SNU-AMS) was completed in December 1998 and a report was presented at the Vienna AMS conference in September 1999. At the conference, we described the basic components of our accelerator system and reported the results of the performance test. Since then, extensive testing of the accuracy and reproducibility of the system has been carried out, and about 200 unknown sampl…
C Level At Mt Chiak and Mt Kyeryong in Korea
We have observed A 14 C concentrations in the northern hemisphere temperate region in the bomb pulse period, using cross-dated tree ring samples. The tree-ring samples were taken from one 70-year-old and two 50-year-old red pines ( Pinus densiflora ) on Mt Chiak, Korea and from a 50-year-old red pine ( Pinus densiflora ) on Mt Kyeryong, Korea. Twenty-two tree-ring samples from four red pines ranging from 1950 to 2000 AD were pretreated to obtain …
Development of a Combustion System for Liquid or Gas Samples
While it is customary to use solid samples for measuring the 14 C/ 12 C ratio, it is sometimes necessary to handle liquid or gas samples. Motivated by a scientific purpose to count radiocarbon yields in deuterated acetone irradiated with energetic neutrons, we developed a new combustion system to treat liquid or gas samples. In contrast with the typical combustion system using CuO for solid samples, the new combustion system uses high-purity O 2 …
Seoul National University Accelerator Mass Spectrometry (SNU-AMS) Radiocarbon Date List II
The accelerator mass spectrometry facility at Seoul National University (SNU-AMS) began functioning in December 1998 and was first reported at the Vienna AMS conference in October 1999 and at the 17th Radiocarbon Conference in Israel in June 2000. At the Vienna conference, we reported our accelerator system (Kim et al. 2000) and the basic sample preparation system (Lee et al. 2000), including the combustion line to produce CO 2 ; the catalytic re…
Seoul National University Accelerator Mass Spectrometry (SNU-AMS) Radiocarbon Date List I
The accelerator mass spectrometry facility at Seoul National University (SNU-AMS) began functioning in December 1998 and was first reported at the Vienna AMS conference in October 1999 and at the 17th International Radiocarbon Conference in Israel in June 2000. At the Vienna conference, we reported our accelerator system (Kim et al. 2000) and details of the basic sample preparation system (Lee et al. 2000), such as the combustion line to produce …
Development of Radiocarbon Dating Methods for Modern Bone Collagenization
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
Simple Pretreatment Method Development for Iron and Calcium Carbonate Samples
Since iron artifacts generally contain trace amounts of carbon, an iron sample needs to be relatively large, as compared to other materials, and a specially designed combustion system is required. An elemental analyzer (EA) was used for the combustion of iron without any special chemical treatment. CO 2 gas with 1 mg of carbon was obtained from the combustion of an iron artifact by using an EA and reduced to graphite for accelerator mass spectrom…
Development of Radiocarbon Dating Method for Degraded Bone Samples from Korean Archaeological Sites
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…
C/ 12 C Variations of Samples Exposed in Air According to Carbon Structure and Air Temperature
Various carbon structures, including carbon nanofilament (CNF), single-wall carbon nanotube (SWCNT), multi-wall carbon nanotube (MWCNT), and pyrolytic graphite sheet (PGS), were exposed in air to determine how they vary according to carbon structure and air temperature. CNF is the carbon structure used in accelerator mass spectrometry (AMS) radiocarbon dating (Santos et al. 2007). When CNF and MWCNT were exposed in cold air (3 or −18 °C) for long…
A Comparison of Distribution Maps of Δ14C of 2010 and 2011 in Korea
Δ14C values of leaves of deciduous trees provide a means to map the regional-scale fossil fuel ratio in the atmosphere. We collected a batch of ginkgo (Ginkgo biloba Linnaeus, a deciduous tree) leaf samples from across Korea in the month of July in both 2010 and 2011 to obtain the regional distribution of Δ14C. The Δ14C values of the samples were measured using accelerator mass spectrometry (AMS) at the Korea Institute of Geoscience and Mineral R…
C/12C Variations of Samples Exposed in Air According to Carbon Structure and Air Temperature
Various carbon structures, including carbon nanofilament (CNF), single-wall carbon nanotube (SWCNT), multi-wall carbon nanotube (MWCNT), and pyrolytic graphite sheet (PGS), were exposed in air to determine how they vary according to carbon structure and air temperature. CNF is the carbon structure used in accelerator mass spectrometry (AMS) radiocarbon dating (Santos et al. 2007). When CNF and MWCNT were exposed in cold air (3 or −18 °C) for long…
A Comparison of Distribution Maps of Δ 14 C in 2010 and 2011 in Korea
Δ 14 C values of leaves of deciduous trees provide a means to map the regional-scale fossil fuel ratio in the atmosphere. We collected a batch of ginkgo (Ginkgo biloba Linnaeus , a deciduous tree) leaf samples from across Korea in the month of July in both 2010 and 2011 to obtain the regional distribution of Δ 14 C. The Δ 14 C values of the samples were measured using accelerator mass spectrometry (AMS) at the Korea Institute of Geoscience and Mi…
Relationship between solar activity and Δ 14 C peaks in AD 775, AD 994, and 660 BC
Since the AD 775 and AD 994 Δ 14 C peak (henceforth M12) was first measured by Miyake et al. (2012, 2013), several possible production mechanisms for these spike have been suggested, but the work of Mekhaldi et al. (2015) shows that a very soft energy spectrum was involved, implying that a strong solar energetic particle (SEP) event (or series of events) was responsible. Here we present Δ 14 C values from AD 721–820 Sequoiadendron giganteum annua…
Radiocarbon age offsets of Plants and Bioclasts in the Holocene Sediments from the Miyazaki Plain, Southeast Coast of Kyushu, Southwest Japan
To investigate the relationship between paleoenvironmental changes and marine reservoir effects, the radiocarbon ages of marine bioclasts and terrestrial plants from the same horizons of a sediment core in the Holocene Epoch were measured. This core, with a length of approximately 9 m, was obtained from the southern part of the Miyazaki Plain southeast of Kyushu Island, which faces the Kuroshio warm current. This drilling site is located in an up…
Estimation of the Occurrence Time of the Δ 14 C Peak in Ad 775 Based on the Oxidation Time of 14 C in the Atmosphere and Δ 14 C Values in Subannual Tree Rings
The 14 C peak in AD 775 (M12) has been measured and confirmed globally in several studies since it was first measured in annual tree rings by Miyake et al. (2012). However, M12 data measurements in early- and latewood are limited. This paper presents the Δ 14 C values in early- and latewood from AD 762–776 Zelkova serrata tree rings from Bangu-dong, Ulsan, South Korea (35°33′N, 129°20′E). The results indicate no early rise in Δ 14 C values in the…
Single-Year German oak and Californian Bristlecone Pine 14 C Data at the Beginning of the Hallstatt Plateau from 856 BC to 626 BC
As part of the ongoing effort to improve the Northern Hemisphere radiocarbon ( 14 C) calibration curve, this study investigates the period of 856 BC to 626 BC (2805–2575 yr BP) with a total of 403 single-year 14 C measurements. In this age range, IntCal13 was constructed largely from German and Irish oak as well as Californian bristlecone pine 14 C dates, with most samples measured with a 10-yr resolution. The new data presented here is the first…
Δ 14 C Peaks Appearing in Earlywood and Latewood Tree Rings (Ad 770–780) in Northeastern Arizona
The AD 775 peak in Δ 14 C (henceforth, M12) was first measured by Miyake et al. and has since been confirmed globally. Here we present earlywood and latewood Δ 14 C values from tree rings of pinyon pine ( Pinus edulis ) from Mummy Cave, Canyon de Chelly National Monument, Chinle, Arizona, USA, for the period AD 770–780. These data reconfirm the timing of M12 and show a small rise in Δ 14 C in AD 774 latewood. Allowing for the delay in lateral tra…
Early 14 C increase in high-latitude trees at 665–664 BC
The discovery of radiocarbon ( 14 C) peaks in AD 774–775 and AD 993–994 sparked the search for other anomalous events, leading to the identification of one around 660 BC. However, the ∼660 BC event appears to show a more prolonged increase, raising the question whether the event is qualitatively different. To investigate this, we measured high-latitude tree rings from Finnish Lapland, expected to be highly sensitive to energetic particle events. …
Radiocarbon dating (17 works) · Geology (14 works) · Accelerator mass spectrometry (10 works) · Archaeology and ancient environmental studies (10 works) · Archaeology (9 works) · Geology and Paleoclimatology Research (9 works) · Paleontology (8 works) · Chemistry (7 works) · Geography (7 works) · Materials Science (6 works)