Preparative centrifugation ? a new method for preparing pollen concentrates suitable for radiocarbon dating by AMS

1996 ◽  
Vol 5 (3) ◽  
pp. 201-205 ◽  
Author(s):  
Joachim Regn�ll ◽  
Einar Everitt
Keyword(s):  
Radiocarbon Dating ◽  
New Method

A new method to constrain soil development time using both OSL and radiocarbon dating

Geoderma ◽  
2016 ◽  
Vol 261 ◽  
pp. 93-100 ◽  
Author(s):  
Xiaodong Miao ◽  
Hong Wang ◽  
Paul R. Hanson ◽  
Joseph A. Mason ◽  
Xiaodong Liu
Keyword(s):  
Radiocarbon Dating ◽  
Development Time ◽  
Soil Development ◽  
New Method

scholarly journals The Integration of Radiocarbon Dating in Archaeology

Radiocarbon ◽  
1983 ◽  
Vol 25 (2) ◽  
pp. 639-644 ◽  
Author(s):  
H T Waterbolk
Keyword(s):  
Radiocarbon Dating ◽  
The Other ◽  
New Method ◽  
Time Range ◽  
Traditional Methods ◽  
Radiocarbon Dates ◽  
Fully Integrated ◽  
Expected Time ◽  
The Past

In the past 30 years many hundreds of archaeologic samples have been dated by radiocarbon laboratories. Yet, one cannot say that 14C dating is fully integrated into archaeology. For many archaeologists, a 14C date is an outside expertise, for which they are grateful, when it provides the answer to an otherwise insoluble chronologic problem and when it falls within the expected time range. But if a 14C date contradicts other chronologic evidence, they often find the ‘solution’ inexplicable. Some archaeologists are so impressed by the new method, that they neglect the other evidence; others simply reject problematic 14C dates as archaeologically unacceptable. Frequently, excavation reports are provided with an appendix listing the relevant 14C dates with little or no discussion of their implication. It is rare, indeed, to see in archaeologic reports a careful weighing of the various types of chronologic evidence. Yet, this is precisely what the archaeologist is accustomed to do with the evidence from his traditional methods for building up a chronology: typology and stratigraphy. Why should he not be able to include radiocarbon dates in the same way in his considerations?

A revolution in radiocarbon dating

Antiquity ◽  
1979 ◽  
Vol 53 (209) ◽  
pp. 226-228
Keyword(s):  
Radiocarbon Dating ◽  
Cosmic Ray ◽  
New Method ◽  
Near Eastern ◽  
University Of Toronto ◽  
Archaeological Materials ◽  
Dating Method ◽  
Atom Counting ◽  
The Individual ◽  
Near Eastern Studies

The conventional radiocarbon dating method relies on the accurate measurement of a sample's beta-ray decay rate in order to determine the age of the sample. The new method instead counts the individual C14 atoms in a sample using an ultra-sensitive mass spectrometer. There are numerous advantages to this approach. The problem of cosmic ray background does not arise. Shorter counting times on samples a thousand times smaller may be possible. We might also expect the production of more accurate age determinations. The new method will permit a great expansion in the variety of archaeological materials which can be dated because only milligram samples will be required. Research on the design of a dedicated C14 atom-counting machine is now in progress. This note is by E. B. Banning, Department of Near Eastern Studies and Department of Physics Archaeometry Laboratory, University of Toronto, Canada, and L. A. Pavlish, Department of Anthropology and Department of Physics Archaeometry Laboratory, University of Toronto, Canada.

scholarly journals Hydropyrolysis: Implications for Radiocarbon Pretreatment and Characterization of Black Carbon

Radiocarbon ◽  
2010 ◽  
Vol 52 (3) ◽  
pp. 1336-1350 ◽  
Author(s):  
P L Ascough ◽  
M I Bird ◽  
W Meredith ◽  
R E Wood ◽  
C E Snape ◽  
...  
Keyword(s):  
Black Carbon ◽  
Radiocarbon Dating ◽  
Elevated Temperatures ◽  
New Method ◽  
Humic Material ◽  
New Approach ◽  
Pyrogenic Carbon ◽  
Organic Components ◽  
Diagenetic Alteration

Charcoal is the result of natural and anthropogenic burning events, when biomass is exposed to elevated temperatures under conditions of restricted oxygen. This process produces a range of materials, collectively known as pyrogenic carbon, the most inert fraction of which is known as black carbon (BC). BC degrades extremely slowly and is resistant to diagenetic alteration involving the addition of exogenous carbon, making it a useful target substance for radiocarbon dating particularly of more ancient samples, where contamination issues are critical. We present results of tests using a new method for the quantification and isolation of BC, known as hydropyrolysis (hypy). Results show controlled reductive removal of non-BC organic components in charcoal samples, including lignocellulosic and humic material. The process is reproducible and rapid, making hypy a promising new approach not only for isolation of purified BC for 14C measurement but also in quantification of different labile and resistant sample C fractions.

Accurate Radiocarbon Dating of Archaeological Ash Using Pyrogenic Aragonite

Radiocarbon ◽  
2017 ◽  
Vol 59 (1) ◽  
pp. 231-249 ◽  
Author(s):  
Michael B Toffolo ◽  
Lior Regev ◽  
Eugenia Mintz ◽  
Kristin M Poduska ◽  
Ruth Shahack-Gross ◽  
...  
Keyword(s):  
Human Activities ◽  
Radiocarbon Dating ◽  
Isotopic Exchange ◽  
New Method ◽  
Mineral Phase ◽  
Density Separation ◽  
The Past ◽  
Main Component ◽  
Unsolved Issue ◽  
Age Determinations

AbstractObtaining accurate age determinations from minerals in archaeological ash is a major unsolved issue in radiocarbon (14C) dating. This is because the original 14C content of calcite, the main component of ash, is altered by isotopic exchange. Pyrogenic aragonite, another mineral phase recently discovered in ash, might preserve its 14C signature through time. Using a new method based on density separation and step combustion, we were able to isolate and date aragonitic ash from an archaeological destruction horizon of known age. Here we show that the 14C age of aragonite matches the age of the destruction horizon. Our results demonstrate that pyrogenic aragonite is a short-lived material suitable for 14C dating and directly related to human activities involving the use of fire, thus bearing major implications for the establishment of absolute chronologies for the past 50,000 yr.

New Method for the Combustion of Samples for Radiocarbon Dating

Nature ◽  
1969 ◽  
Vol 221 (5175) ◽  
pp. 49-50 ◽  
Author(s):  
HAROLD BARKER ◽  
RICHARD BURLEIGH ◽  
NIGEL MEEKS
Keyword(s):  
Radiocarbon Dating ◽  
New Method

scholarly journals PENANGGALAN 14C UNTUK MENENTUKAN UMUR PELAPUKAN TANAH DENGAN METODE RADIOKARBON

2012 ◽  
Vol 32 (2) ◽  
pp. 125-134
Author(s):  
Darwin A. Siregar ◽  
Satrio Satrio
Keyword(s):  
Radiocarbon Dating ◽  
Age Determination ◽  
New Method ◽  
Co2 Absorption ◽  
Isotope Hydrology ◽  
Absorption Method ◽  
Carbon Sample ◽  
Material Cost ◽  
Direct Counting

Radiocarbon dating is a tool for age determination of a carbon sample. During the time, synthesis benzene method is used for age determination mentioned. By this method it could be analyzed one sample per day only with high material cost. Lately, it has been developed a new method, namely CO2 absorption method. The latest method is often called as direct counting CO2, because radioisotope of 14C in CO2 is counted directly and converted to age. The aim of the development and the use of the method are supporting some research in isotope hydrology, oceanography, climatology, geology, and archeology by faster, economic and practice. The result of 14C analyses for the same sample using the CO2 absorption when compared to the synthesis benzene method is relatively equal.  

New Method of Collagen Extraction for Radiocarbon Dating

Nature ◽  
1971 ◽  
Vol 230 (5291) ◽  
pp. 241-242 ◽  
Author(s):  
R. LONGIN
Keyword(s):  
Radiocarbon Dating ◽  
New Method

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

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