| 词汇 | radioactivity |
| 释义 | radioactivity noun[ U ] uk /ˌreɪ.di.əʊ.ækˈtɪv.ə.ti/ us /ˌreɪ.di.oʊ.ækˈtɪv.ə.t̬i/ the quality that some atoms have of producing a type of energy that can be very harmful to health放射（性） the energy produced by atoms in this way: 放射线；辐射线；辐射能 A dangerous amount of radioactivity was released into the environment last month.上个月泄漏了大量的放射线，造成很大危险。 Physics: radiation & radioactivity alpha particle background radiation decay electromagnetic radiation gamma radiation gamma ray irradiation luminosity non-ionizing non-irradiated nonradioactive radioisotope sievert spectrometer spectrometric spectrometry UPF UVA UVB weak force Examples of radioactivityradioactivity After incubation for 4 h the precipitates were washed again, transferred to the new tubes and their radioactivity determined. Two aspects of this alteration and the value of radioactivity to advanced life deserve attention, as detailed below. A significant increase in the amount of radioactivity incorporated into the frozen- thawed fraction from the mixed population was evident 6 h after incubation. The results were calculated by expressing the bound radioactivity as a percentage of the total radioactivity. Radioactivity was found in all three intermediates - 3-ketosphingosine, dihydrosphingosine and sphingosine. In the high altitude environment, oxygen and air density decrease, temperature and humidity are low and there is an increase in radioactivity. Phenomena such as collisions, radioactivity and thermodynamics make for novel compositional tools via these sonification methods. At the time stated, samples were taken for cytotoxicity assay and radioactivity determination. Incorporated radioactivity was measured at time-points between 10 and 120 sec. Transport was calculated from counts of decompositions of radioactivity recorded from a scintillation counter ; and expressed as rmoles/108 cells. Nuclear wastes emit heat, although the amount varies according to the nature of the wastes and their radioactivity. Such decreases in efflux of radioactivity in response to tripelennamine were observed in each of five other experiments. Three millilitres of scintillation fluid were added to the void volume and radioactivity measured. Other areas of reduced radioactivity were classified as small lesions. The amount of radioactivity fixed in the tubes was compared with that of control tubes reacted with the antibody alone. See all examples of radioactivity 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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