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31. The half-life of a radioactive substance is the time interval taken for the radiant species present to lose half its radioactivity.

32. There are no serious long-term spent-fuel reprocessing or waste problems nor is there a potential for the large scale release of radioactivity.

33. The first is the internal heat produced by radioactivity in the Earth.

34. Children with more than 60 becquerels of radioactivity per kilo of bodyweight are thought to be at risk from disease.

35. Yet these elements have had a profound effect on the evolution of the Earth because of their radioactivity.

36. One can then compare the amount of radioactivity in control and trained chicks region by region and look for differences.

37. Fields adjacent to the nuclear facility were found to have high levels of radioactivity. Sentencedict.com

38. At St-Aubin, soil contains 30 times the acceptable level of radioactivity.

39. The ratio of radioactivity of ulcer area v intact mucosa was calculated for each group of rats.

40. Radioactivity is induced in the metallic containment vessel that surrounds a reactor core by neutrons that escape from the core.

41. Another simple but ingenious technique enables one to separate the individual proteins and measure the amount of radioactivity in each.

42. Officials said they expect that no radioactivity will be released into the atmosphere.

43. The greenhouse effect and radioactivity from nuclear waste hurt people not even born.

44. Several chemical elements decay with age, producing radioactivity in the process.

45. Crystals embedded in the back of the chair detect the radioactivity level in the children's bodies.

46. No radioactivity was detected(sentencedict.com), and there was no disruption of aircraft electronics.

47. There, they surrendered cigarettes, breath mints and gum, which might pick up radioactivity that could be ingested.

48. Radioactivity is a special quality of radium.

49. Overburden had concealed the radioactivity.

50. Preventing noise, electromagnetic radiation, and radioactivity pollution?

51. the process of decontaminating areas exposed to radioactivity.

52. The Geiger counter showed the existence of radioactivity.

53. This is a Geiger counter for detecting radioactivity.

54. Some rare metals have radioactivity.

55. The material is free from radioactivity, nontoxic and harmless.

56. Natural radioactivity contains a store of valuable information.

57. There was in nature another element which sent out radioactivity.

58. In this paper, through the theoretical analysis and practice, the au thor have discussed the results of quantitative calculation for radioactivity logging with computer in detail.

59. Generation hip radioactivity is neuralgic , make articulatory dash forward articulatory face produces traumatic sex arthritis, aggravating waist leg is painful.

60. Lanthanum - tungsten electrode is the substitution product of thorium - tungsten electrode because of its freedom from radioactivity.