scholarly journals Radiocarbon Calibration for Japanese Wood Samples

Radiocarbon ◽  
2003 ◽  
Vol 45 (1) ◽  
pp. 81-89 ◽  
Author(s):  
Minoru Sakamoto ◽  
Mineo Imamura ◽  
Johannes Van der Plicht ◽  
Takumi Mitsutani ◽  
Makoto Sahara
Keyword(s):  
Mass Spectrometry ◽  
North America ◽  
Tree Ring ◽  
Calibration Curve ◽  
Accelerator Mass Spectrometry ◽  
The Difference ◽  
Radiocarbon Calibration

The radiocarbon content of Japanese cedars was measured by accelerator mass spectrometry for decadal tree-ring samples from the period of 240 BC to AD 900. Conventional gas counting was also used for part of the samples. The data were compared with the INTCAL98 calibration curve (Stuiver et al. 1998). The results indicate that the difference in atmospheric 14C between Japan and North America or Europe is negligible at this period, less than 18 14C yr using an average of 50 yr. However, in the period of about AD 100 to about AD 200, we cannot exclude the possibility of a deviation of the order of 30 to 40 14C yr to the older ages.

scholarly journals Radiocarbon in 9th to 5th Century BC Tree-Ring Samples from the Ouban 1 Archaeological Site, Hiroshima, Japan

Radiocarbon ◽  
2007 ◽  
Vol 49 (2) ◽  
pp. 473-479 ◽  
Author(s):  
Hiromasa Ozaki ◽  
Mineo Imamura ◽  
Hiroyuki Matsuzaki ◽  
Takumi Mitsutani
Keyword(s):  
Mass Spectrometry ◽  
Tree Ring ◽  
Calibration Curve ◽  
Accelerator Mass Spectrometry ◽  
Wood Sample ◽  
Archaeological Site ◽  
Short Term ◽  
Statistical Errors ◽  
Term Fluctuation

In order to investigate the regional atmospheric radiocarbon offset, accelerator mass spectrometry (AMS) 14C measurements were made on 5-yr increments of a Japanese wood sample dendrochronologically dated to 820–436 BC. The 14C data from the Japanese tree-ring samples were compared with the IntCal04 calibration curve (Reimer et al. 2004). In most parts, the differences between IntCal04 and 14C dates in the Japanese tree-ring samples were within experimental statistical errors. At around 680 BC, however, significant differences of up to 100 14C yr were observed. These differences may indicate either regional offsets in Japan or the short-term fluctuation of a subdecadal timescale in atmospheric 14C variations.

scholarly journals Problems in the Extension of the Radiocarbon Calibration Curve (10–13 kyr BP)

Radiocarbon ◽  
1995 ◽  
Vol 37 (1) ◽  
pp. 75-79 ◽  
Author(s):  
Irena Hajdas ◽  
Susan D. Ivy-Ochs ◽  
Georges Bonani
Keyword(s):  
Mass Spectrometry ◽  
Time Scales ◽  
Calibration Curve ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Late Glacial ◽  
Varved Lake Sediments ◽  
Ams Dating ◽  
Varve Counting ◽  
Radiocarbon Calibration

Radiocarbon dating of varved lake sediments shows that, during the Late Glacial (10–12 kyr bp), the offset between the 14C and the absolute time scales was ca. 1 kyr. Varve counting and accelerator mass spectrometry (AMS) dating were used to build absolute and 14C time scales of sediments from two lakes—Soppensee, Switzerland and Holzmaar, Germany. The resulting chronologies extend back to ca. 12.9 kyr cal bp (12.1 kyr bp) in the case of Soppensee and to ca. 13.8 kyr cal BP (12.6 kyr bp) in the Holzmaar record. They compare well with each other but differ significantly from the 14C-U/Th chronology of corals (Bard et al. 1993; Edwards et al. 1993).

scholarly journals Findings from an in-Depth Annual Tree-Ring Radiocarbon Intercomparison

Radiocarbon ◽  
2020 ◽  
Vol 62 (4) ◽  
pp. 873-882 ◽  
Author(s):  
L Wacker ◽  
E M Scott ◽  
A Bayliss ◽  
D Brown ◽  
E Bard ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Tree Ring ◽  
High Precision ◽  
Calibration Curve ◽  
Accelerator Mass Spectrometry ◽  
Large Datasets ◽  
Accuracy And Precision ◽  
Short Period ◽  
Annual Resolution

ABSTRACTThe radiocarbon (14C) calibration curve so far contains annually resolved data only for a short period of time. With accelerator mass spectrometry (AMS) matching the precision of decay counting, it is now possible to efficiently produce large datasets of annual resolution for calibration purposes using small amounts of wood. The radiocarbon intercomparison on single-year tree-ring samples presented here is the first to investigate specifically possible offsets between AMS laboratories at high precision. The results show that AMS laboratories are capable of measuring samples of Holocene age with an accuracy and precision that is comparable or even goes beyond what is possible with decay counting, even though they require a thousand times less wood. It also shows that not all AMS laboratories always produce results that are consistent with their stated uncertainties. The long-term benefits of studies of this kind are more accurate radiocarbon measurements with, in the future, better quantified uncertainties.

scholarly journals Quality Dating: A Well-Defined Protocol Implemented at ETH for High-Precision 14C-Dates Tested on Late Glacial Wood

Radiocarbon ◽  
2019 ◽  
Vol 62 (4) ◽  
pp. 891-899 ◽  
Author(s):  
Adam Sookdeo ◽  
Bernd Kromer ◽  
Ulf Büntgen ◽  
Michael Friedrich ◽  
Ronny Friedrich ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Tree Ring ◽  
High Precision ◽  
Accelerator Mass Spectrometry ◽  
Late Glacial ◽  
Tree Ring Chronology ◽  
Continuous Measurements ◽  
Calibration Curves

ABSTRACTAdvances in accelerator mass spectrometry have resulted in an unprecedented amount of new high-precision radiocarbon (14C) -dates, some of which will redefine the international 14C calibration curves (IntCal and SHCal). Often these datasets are unaccompanied by detailed quality insurances in place at the laboratory, questioning whether the 14C structure is real, a result of a laboratory variation or measurement-scatter. A handful of intercomparison studies attempt to elucidate laboratory offsets but may fail to identify measurement-scatter and are often financially constrained. Here we introduce a protocol, called Quality Dating, implemented at ETH-Zürich to ensure reproducible and accurate high-precision 14C-dates. The protocol highlights the importance of the continuous measurements and evaluation of blanks, standards, references and replicates. This protocol is tested on an absolutely dated German Late Glacial tree-ring chronology, part of which is intercompared with the Curt Engelhorn-Center for Archaeometry, Mannheim, Germany (CEZA). The combined dataset contains 170 highly resolved, highly precise 14C-dates that supplement three decadal dates spanning 280 cal. years in IntCal, and provides detailed 14C structure for this interval.

scholarly journals 14C Wiggle-Matching of the B-Tm Tephra, Baitoushan Volcano, China/North Korea

Radiocarbon ◽  
2010 ◽  
Vol 52 (3) ◽  
pp. 933-940 ◽  
Author(s):  
Shinya Yatsuzuka ◽  
Mitsuru Okuno ◽  
Toshio Nakamura ◽  
Katsuhiko Kimura ◽  
Yohei Setoma ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
North Korea ◽  
Radiocarbon Dating ◽  
Gas Emission ◽  
Volcanic Gas ◽  
Ams Radiocarbon Dating ◽  
Eruption Age ◽  
The Difference ◽  
Volcanic Gas Emission

We performed accelerator mass spectrometry (AMS) radiocarbon dating and wiggle-matching of 2 wood samples from charred trunks of trees (samples A and B) collected from an ignimbrite deposit on the northeastern slope of the Baitoushan Volcano on the border of China and North Korea. The obtained calendar years for the eruption are cal AD 945–960 for sample A and cal AD 859–884 and cal AD 935–963 for sample B in the 2-σ range. These results are unable to determine the precise eruption age. The reason for the difference in reported ages may be due to volcanic gas emission prior to the huge eruption.

Radiocarbon and Protein Analyses Indicate an Early Holocene Age for the Osseous Rod from Grenfell, Saskatchewan, Canada

2014 ◽  
Vol 79 (4) ◽  
pp. 782-793 ◽  
Author(s):  
John W. Ives ◽  
Duane Froese ◽  
Matthew Collins ◽  
Fiona Brock
Keyword(s):  
Mass Spectrometry ◽  
North America ◽  
Accelerator Mass Spectrometry ◽  
Early Holocene ◽  
Raw Material ◽  
Long Bone ◽  
Data Sets ◽  
Additional Information ◽  
Made In ◽  
Do So

AbstractThe Grenfell bone rod resembles other instances of Clovis-era organic or osseous technology and has on a number of occasions been considered with other Clovis bone, antler, and ivory rods or beveled artifacts. It had been suspected of being constructed from proboscidean long bone. As an early discovery (made in 1883), the Grenfell artifact had somewhat obscure provenience details and a lengthy curatorial history. We describe accelerator mass spectrometry and zooarchaeology by mass spectrometry methods that allow rapid, minimally destructive determinations of both the age and the raw material composition of osseous artifacts. Our analysis reveals that the Grenfell artifact is actually a terminal Paleoindian-era manifestation made of bison bone. Similar methods could be more widely applied in North America in order to build more refined data sets for osseous technologies. These results also reveal the ease with which archaeologists can secure additional information from existing collections, highlighting our ethical obligations to do so.

Revised ‘absolute’ dating of the early Mesolithic site of Star Carr, North Yorkshire, in the light of changes in the early Holocene tree-ring chronology

Antiquity ◽  
2000 ◽  
Vol 74 (284) ◽  
pp. 304-307 ◽  
Author(s):  
Petra Dark
Keyword(s):  
Environmental Change ◽  
Tree Ring ◽  
Calibration Curve ◽  
Early Holocene ◽  
Tree Ring Chronology ◽  
Absolute Dating ◽  
The Absolute ◽  
Holocene Environmental Change ◽  
Radiocarbon Calibration

Recent revision of the radiocarbon calibration curve for the early Holocene has implications for the ‘absolute’ date of Mesolithic sites such as Star Carr, and for their relationship to the timescale of early Holocene environmental change.

scholarly journals Counting Statistics and Ion Interval Density in AMS

Radiocarbon ◽  
2004 ◽  
Vol 46 (3) ◽  
pp. 1103-1109 ◽  
Author(s):  
John S Vogel ◽  
Ted Ognibene ◽  
Magnus Palmblad ◽  
Paula Reimer
Keyword(s):  
Mass Spectrometry ◽  
Accelerator Mass Spectrometry ◽  
Temporal Distribution ◽  
Counting Statistics ◽  
Random Nature ◽  
Radiocarbon Calibration ◽  
Age Determinations

Confidence in the precisions of accelerator mass spectrometry (AMS) and decay measurements must be comparable for the application of the radiocarbon calibration to age determinations using both technologies. We confirmed the random nature of the temporal distribution of 14C ions in an AMS spectrometer for a number of sample counting rates and properties of the sputtering process. The temporal distribution of ion counts was also measured to confirm the applicability of traditional counting statistics.

scholarly journals Tree-Ring Dating and AMS Wiggle-Matching of Wooden Statues at Neunggasa Temple in South Korea

Radiocarbon ◽  
2010 ◽  
Vol 52 (3) ◽  
pp. 924-932 ◽  
Author(s):  
Won-Kyu Park ◽  
Yojung Kim ◽  
Ah-Reum Jeong ◽  
Sang-Kyu Kim ◽  
Jung-Ae Oh ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Confidence Interval ◽  
South Korea ◽  
Tree Ring ◽  
Tree Rings ◽  
Accelerator Mass Spectrometry ◽  
Early Spring ◽  
Radiocarbon Date ◽  
Historical Document ◽  
Natural Drying

This paper reports the results of tree-ring dating and accelerator mass spectrometry (AMS) wiggle-matching for wooden Buddhist statues stored at the Eungjindang Hall of Neunggasa Temple, South Korea. Among 23 statues, 10 were successfully dated by tree rings. The cutting date of logs used for the statues was determined as some time between late fall 1684 and early spring 1685 when the bark ring (AD 1684) completed latewood formation. The 95.4% confidence interval of a radiocarbon date (cal AD 1688–1713, 2 σ), which was obtained by wiggle-matching 7 samples of a statue, is similar to the dendro-date (AD 1684). A historical document recorded that the statues in the Eungjindang of Neunggasa were dedicated in July 1685. The dendro-date and written record indicate that Eungjindang statues were made within 3–8 months after log cutting. This seems rather short if we consider the period required for natural drying to avoid defects such as cracking and crooking.

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