Nghĩa của từ radiocarbon|radiocarbons bằng Tiếng Anh

noun

['reɪdɪəʊ'kɑrbən /-'kɑːb-]

radioactive isotope of carbon (Chemistry)

Đặt câu với từ "radiocarbon|radiocarbons"

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1. 5 To correct this error radiocarbon dates are calibrated by studying the difference between radiocarbon dates and tree-ring dates.

2. Radiocarbon dating of the bones at Oxford University's Radiocarbon Accelerator Unit determined the time period to be 850 CE ±30 years.

3. They have supplied such samples to the radiocarbon laboratories, and these dates are now widely accepted as providing a solid foundation for the radiocarbon chronology.

4. 28 The journal Radiocarbon publishes the most up-to-date curves which in principle permit the conversion of radiocarbon dates to calibrated dates.

5. The title implies that radiocarbon dating is no longer regarded as absolute.

6. THE title of the Twelfth Nobel Symposium was “Radiocarbon Variations and Absolute Chronology.”

7. 13 Although calibration complicates the process of interpreting the radiocarbon results, it is essential.

8. 6 For the later range of radiocarbon dates this calibration is well-established.

9. 17 Thus, whenever possible the radiocarbon age should be calibrated to actual calendar years.

10. Arctogaean and postgrad students who need radiocarbon dating was founded in miami, provides fast high-quality ams dates

11. H03 Scientific Dates/ Radiocarbon Data* Indicate absolute dates acquired from the site or site components, if available.

12. (11) Buried samples can either gain or lose radiocarbon through leaching by groundwater or by contamination.

13. 23 In converting radiocarbon results to calendar dates, the wiggles in the calibration curve are the real problem.

14. Radiocarbon generated by atmospheric testing of nuclear weapons (bomb radiocarbon) produced a strong signal with an abrupt onset in the 1950s, which serves as a dated marker for tracing oceanic circulation and confirming age in animals forming growth bands.

15. Caveat that • All of the Caveats that apply to radiocarbon dating apply to its use in authentication.

16. One bone has been radiocarbon dated to 200 BCE; forest destruction by humans may have contributed to its extinction.

17. So the radiocarbon clock is no longer regarded as yielding an absolute chronology but one which measures only relative dates.

18. The characteristic terrace morphologies and alluvial sediment sequences are briefly described, but most importantly, the deposits are radiocarbon dated for many sites.

19. Similarly, radiocarbon dating of American east coastal subfossil remains confirm that gray whales existed there at least through the 17th century.

20. An independent chronology for these reconstructions is essential and this is provided by radiocarbon-dating of organic material preserved in the sediments.

21. Radiocarbon dating suggested that the chickens were Pre-Columbian, and DNA analysis showed that they were related to prehistoric populations of chickens in Polynesia.

22. In 1988, three radiocarbon dating tests dated a corner piece of the shroud from the Middle Ages, between the years 1260 and 1390.

23. 18 The team obtained the date of 9260 years ago for the coprolite by radiocarbon dating one of the prickly pear seeds inside.

24. 23 Using radiocarbon techniques on sediments collected from four rivers, they determined that bacteria may alter riverine carbon, making it indistinguishable from ocean carbon.

25. According to the tests carried out by Oxford University Radiocarbon Accelerator Unit, "with a probability of more than 95%, the parchment was from between 568 and 645".