单词 | isotope |
释义 | isotope (aɪsətoʊp ) Word forms: isotopes countable noun Isotopes are atoms that have the same number of protons and electrons but different numbers of neutrons and therefore have different physical properties. [technical] ...tritium, a radioactive isotope of hydrogen. Collocations: isotope analysis Yet, the isotope analysis reveals the inhabitants weren’t eating fish or seafood. Retrieved from Wikipedia CC BY-SA 3.0 Isotope analysis of his teeth indicates that he grew up locally, moved away and returned in his later years. Times,Sunday Times The stable isotope analysis was more accurate, and even revealed a few mistaken identities among the earlier analyses. Retrieved from Wikipedia CC BY-SA 3.0 What's more, his face has been reconstructed with the help of modern marvels such as isotope analysis. Times, Sunday Times The isotope analysis of the ancient pandas appears to show that as late as 5,000 years ago, giant pandas had a much more varied diet than their bamboo-chomping descendents. Retrieved from Wikipedia CC BY-SA 3.0 C graphene has higher conductivity than either a 50:50 isotope ratio or the naturally occurring 99:1 ratio. Retrieved from Wikipedia CC BY-SA 3.0 The ratios of isotopes in a sample material are measured by isotope ratio mass spectrometry. Retrieved from Wikipedia CC BY-SA 3.0 Fractionation occurs due to the excitation of the sample and therefore must be corrected for accurate measurement of the isotope ratio. Retrieved from Wikipedia CC BY-SA 3.0 The relative abundance of such stable isotopes can be measured experimentally (isotope analysis), yielding an isotope ratio that can be used as a research tool. Retrieved from Wikipedia CC BY-SA 3.0 C isotope ratio different from that typical of diamonds from peridotite xenoliths. Retrieved from Wikipedia CC BY-SA 3.0 Oxygen isotope ratios in drinking water are affected by latitude, air temperature and rainfall. Times, Sunday Times Such a pattern seems to fit the information on climate change found in oxygen isotope cores. Retrieved from Wikipedia CC BY-SA 3.0 If so, the data about oxygen isotope ratios would be incomplete, especially for times when the extremities were coolest. Retrieved from Wikipedia CC BY-SA 3.0 A review of the oxygen isotope composition of lacustrine diatom silica for palaeoclimate reconstruction. Retrieved from Wikipedia CC BY-SA 3.0 Chondrite meteorites are classified using the oxygen isotope ratios. Retrieved from Wikipedia CC BY-SA 3.0 Not until an hour after the patients arrived was it established that they had come into contact with the radioactive isotope caesium-137. Times, Sunday Times Scientists have found traces of the radioactive isotope polonium-210 in his body and possessions. Times, Sunday Times I will take a capsule of a highly radioactive isotope of iodine, 131, that will destroy any thyroid tissue remaining. The Times Literary Supplement Upon collision with a neutrino, a chlorine atom transforms into a radioactive isotope of argon, which can then be extracted and counted. Retrieved from Wikipedia CC BY-SA 3.0 Among elements with a known stable isotope, only tellurium and rhenium similarly occur with a stable isotope in lower abundance than the long-lived radioactive isotope. Retrieved from Wikipedia CC BY-SA 3.0 The stable isotope analysis was more accurate, and even revealed a few mistaken identities among the earlier analyses. Retrieved from Wikipedia CC BY-SA 3.0 Stable isotope analysis will establish the lifestyle, environment and diet to which they were exposed. Times, Sunday Times For 80 of the chemical elements, at least one stable isotope exists. Retrieved from Wikipedia CC BY-SA 3.0 Isotopic tracers are usually subdivided into two categories: stable isotope tracers and radiogenic isotope tracers. Retrieved from Wikipedia CC BY-SA 3.0 O stable isotope systematics in limestone on either side of a stylolite plane and found differences confirming different degrees of fluid-rock interaction. Retrieved from Wikipedia CC BY-SA 3.0 Translations: Chinese: 同位素 Japanese: アイソトープ |
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