单词 | Radiocarbon |
例句 | 1) The most frequently used method is radiocarbon dating. 2) But several factors affect the accuracy of radiocarbon dating. 3) This is the basis of conventional radiocarbon dating. 4) To correct this error radiocarbon dates are calibrated by studying the difference between radiocarbon dates and tree-ring dates. 5) Most errors in radiocarbon dating arise because the excavator has not fully understood the formation processes of the context in question. 6) Just as dramatically, radiocarbon dating has shown that the Neolithic was introduced to Britain at least 1500 years earlier than previously believed. 7) In converting radiocarbon results to calendar dates, the wiggles in the calibration curve are the real problem. 8) But after death, the amount of radiocarbon decreases at a fixed rate: it halves every 5730 years. 9) All of the caveats that apply to radiocarbon dating apply to its use in authentication. 10) For the later range of radiocarbon dates this calibration is well-established. 11) If dated by conventional radiocarbon, it would have been totally destroyed during measurement. 12) The journal Radiocarbon publishes the most up-to-date curves which in principle permit the conversion of radiocarbon dates to calibrated dates. 13) The principles of radiocarbon dating are fairly straight forward, but in practice there are many problems. 14) Because of the difficulties associated with radiocarbon dating,[http:///radiocarbon.html] each new date is given a statistical margin of error. 15) For direct archaeological applications, radiocarbon dating and tree-ring work are in general much more useful. 16) Radiocarbon Dating Radiocarbon is the single most useful method of dating for the archaeologist. 17) The most well-known application of radiocarbon must be the dating of the Shroud of Turin. 18) All radiocarbon samples should be sealed within a clean container such as a plastic bag at the time of recovery. 19) One of the basic assumptions of the radiocarbon method has turned out to be not quite correct. 20) In the absence of radiocarbon dates these interpretations must remain untested but attractive hypotheses. 21) Although calibration complicates the process of interpreting the radiocarbon results, it is essential. 22) This is most frequently applied to radiocarbon dates from tree-rings. 23) Thus, whenever possible the radiocarbon age should be calibrated to actual calendar years. 24) Conventional radiocarbon dating normally requires sample sizes which will yield a minimum of 1 g of carbon. 25) In one comparative study, over 30 radiocarbon laboratories dated the same sample. 26) And its use in radiocarbon dating. 27) After this pretreatment, the sample is converted to a form suitable for the particular method of radiocarbon dating to be used. 28) The sample preparation procedures are the same as those used for radiocarbon dating, care being taken to avoid contamination. 29) Palmer originally specialised in acoustics but became interested in the physics of the Earth and in measuring ages by radiocarbon dating. 30) Concluding remarks Scientific dating techniques, and none more than radiocarbon, have revolutionised the archaeologist's understanding of human cultural development. 31) Researchers use radiocarbon to study certain biological processes. 32) All living things contain radiocarbon. 33) Radiocarbon of soil organic matter (SOM)in Dinghushan subtropic forest has been adjusted by the "bomb-effect". 34) Who says there are no pyramids in Bosnia? Radiocarbon dating method confirmed that the Bosnian Pyramid of the Moon was built about ten thousand years ago! 35) Radiocarbon dating showed that the head's age matched the king's date of death. 36) Accelerators also used for radioisotope production, cancer therapy, Biological sterilization, and one form of radiocarbon dating. 37) Because they rely on estimation, relative techniques like stratigraphy are considered less precise than absolute techniques, like radiocarbon dating or verification from written records. 38) The radiocarbon test result indicated that this cone-shape tool is Bai a Weilu pin bone, long approximately 12 centimeters, was probably has 10400 years. 39) Accordingto Bunce, eggshell is the best substance for radiocarbon dating andisotope analysis, which gives information about the environment inwhich the egg was laid. 40) The reliability of radiocarbon dating depends on the reliability of dating material. 41) "We are able to date [the samples] precisely and work on samples hundreds of thousands of years old, far beyond the limit of about 50,000 years that radiocarbon dating allows," Wang told SciDev.Net. 42) The professor believes the radiocarbon dating of the shroud was wrong because the sample was contaminated. 43) Using the technique of radiocarbon dating, they all agreed that the cloth dated to the 13th or 14th century (1260 to 1390). 44) The material in this beach has been dated by radiocarbon. 44) is a sentence dictionary, on which you can find excellent sentences for a large number of words. 45) The initial stone circle at Stonehenge radiocarbon - dated to between 2600 and 2500 B.C. 46) Radiocarbon tests date it to the middle ages, however apologists for the shroud believe it is incorrupt - and carbon dating can only date things which decay. 47) This has been known for a long time, from radiocarbon dating from charcoal by paleontologists, " he says." 48) Radiocarbon dating showed the family lived around 2600 B.C. and belonged to the Corded Ware culture, named for the distinctive twisted impressions that decorated artifacts of the time. 49) Radiocarbon dating in 1988 showed the cloth was made between 1260 and 1390. 50) So far, radiocarbon dating of the site has linked it to the 10th and 9th centuries B. C. , the Iron Age. 51) The leaf was allowed to photosynthesize in the presence of radiocarbon. 52) The team obtained the date of 9260 years ago for the coprolite by radiocarbon dating one of the prickly pear seeds inside. 53) Radiocarbon dating experts have also found advantages from working onsite with archaeologists. 54) Radiocarbon dating indicates the figure excavated from an archaeological dig in southern Germany, near the Danube valley, was at least 35, 000 years old, the researchers said. 55) So it turns out that radiocarbon dating works for a lot of prehistorical art. 56) Results of radiocarbon dating showed that the chestnut soils of China and the mollisols in other countries of the world were the product of the same period, formed about 6000 years apo. 57) Bacteria and bacterial residue carry additional carbon and would skew the radiocarbon date toward the present. 58) Radiocarbon dating in 1988 by three independent teams of scientists determined that it was made during the Middle Ages, long after Jesus lived. 59) Using radiocarbon techniques on sediments collected from four rivers, they determined that bacteria may alter riverine carbon, making it indistinguishable from ocean carbon. 60) It is the stuff of coal, soot, diamonds, radiocarbon dating, pencils, climate change, graphite lubricants, charcoal – and a startling number of Nobel prizes. 61) Radiocarbon dating confirmed: Bosnia's Moon Pyramid was built about ten thousand years ago! |
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