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1. Every radioactive isotope provides an independent clock for measuring geological time.

2. Brachytherapy, the direct application of a radioactive isotope into the tumor bed, delivers a high dose to the tumor as compared to the surrounding normal tissue.

3. At present, radioactive isotope tracing and impulse oxygen activation are the two mostly used methods for injection profile logging in separated-zone water injectors.

4. The contents concern in the development of radioactive isotope tracer energy spectrum logging device, the calibration experiment in model well, the analysis of experimental data, the data ...

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5. A radioactive isotope of cobalt with mass number '0 and exceptionally intense gamma-ray activity, used in radiotherapy, metallurgy, and materials testing.

6. A naturally or artificially produced radioactive isotope of an element.

7. Caesium - 137 is a radioactive isotope, formed mainly through nuclear fission.

8. A radioactive isotope of cobalt emits penetrating gamma rays that are used in radiation therapy.

9. BEIJING - Trace levels of radioactive isotope cesium-137 and cesium-134 were detected in the air of 13 of the Chinese mainland's 31 provincial-level regions on Monday, up from eight regions on Sunday.

10. Those radioactive elements are N-16 the radioactive isotope (or version) of nitrogen (air).

11. The importation of the radioactive isotope, radiation equipment and other radioactive materials should come up to applicable state regulations.

12. Increasing the helium-3 supply would mean scaling up the production of the dangerous radioactive isotope tritium.

13. The time taken for half of the atoms of a radioactive isotope to decay is called its half-life.

14. The new ingredient in the assessment of how many deaths the Windscale cloud caused is the radioactive isotope, polonium 210.

15. She could hear the adjacent streetlight sizzling like a radioactive isotope.

16. The simplest radioactive methods are based on decay of a radioactive isotope into a stable one.

17. They include a laboratory for handling tritium, the heavy radioactive isotope of hydrogen which is a fuel for fusion reactors.

18. Uptake, translocation, and distribution of 14C-labelled oligosaccharides in watermelon seedling were investigated by the means of radioactive isotope tracer.

19. For instance, because it takes only 8 days for the radioactive isotope iodine-131 to decay away to half its original level of radioactivity, simply waiting should be a fix.

20. The city's challenge, chiefly, is to dispose of cesium-137, a radioactive isotope with a half-life of 30 years.

21. "What it amounts to, " said Billings, "is that The Goose can convert any radioactive isotope into a stable one. It has developed the perfect defense against radiation sickness.

22. "What it amounts to, " said Billings, "is that The Goose can convert any radioactive isotope into a stable one..."

23. Conclusion It is not difficult to diagnose RT correctively. Cervico thoracic X ray film, radioactive isotope and CT checking can ensure the extent and character of the retrosternal part.

24. Relations between Britain and Russia nosedived after the 2006 murder of Alexander Litvinenko with polonium-210, a rare radioactive isotope, blamed by his associates on Russian agents.

25. The meteorite, which recently fell to the tropical island in Pacific Ocean, proved to be the present well of the thinnest radioactive isotope!