| 词汇 | half-life |
| 释义 | half-life noun[ C ] physics specializeduk /ˈhɑːf.laɪf/ us /ˈhæf.laɪf/ the length of time needed for the radioactivity of a radioactive substance to be reduced by half（放射性物质的）半衰期 Physics: radiation & radioactivity alpha particle background radiation decay electromagnetic radiation gamma radiation gamma ray luminosity non-ionizing non-irradiated nonradioactive post-irradiation radioisotope sievert spectrometer spectrometric spectrometry UPF UVA UVB weak force half-life | American Dictionaryhalf-life noun[ Cusually sing ] us/ˈhæfˌlɑɪf/ physics, earth science the amount of time needed for the radioactivity (= harmful form of energy) of a radioactive substance to be reduced by half Examples of half-lifehalf-life It is then inactivated by hemoglobin, giving it a very short elimination half-life. Fluvoxamine shows the least non-linearity of pharmacokinetic parameters, with half-life increasing from about 15 to 23 hours with multiple dosing. The authors reported rates of change to more appropriate therapeutic agents that were significantly greater than expected, and as high 40% for long half-life benzodiazepines. Entacapone has a similar half-life to levodopa and is usually given with each levodopa dose. It has a very long half-life of 3-5 days; its significant adverse-event profile requires extremely slow dose titration every 2- 3 weeks. The half-life of output rises from 13 years to 40 years as persistence increases from none to complete. Pharmacokinetic data are collected to determine the half-life, the maximum concentration area under-the-curve, and other parameters. A cyclotron is required to produce fluorine18, a radioisotope with a half-life of less than 2 hours (110 min), which makes storage impossible. In analogy, the macroproperty of half-life may be attributed to uranium. On soil the half-life of antibody-detectable slug proteins was 8.2 days while on peat it was 11.5 days. No wonder most genuine attempts to establish interdisciplinary seminars have a short half-life. The plasma half-life of the diacid body was also measured in five of these patients. Comparable studies of more groups will enable us to identify some of the taxonomic and physiological correlates of the detectability half-life. When the inhibitor has a long half-life, fluctuations may also introduce correlations between individual replication trials. Most are given three times daily, but cabergoline, which has a very long half-life, can be given once a day. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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