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31. Among the refractory materials found in the lunar samples are refractory compounds of uranium and thorium.

32. The second was that its atoms of uranium were transmuting themselves into atoms of a different element whose atomic mass was lower.

33. The amount of uranium in the belt is about four billion tons, enough to make roughly a trillion tactical nuclear weapons.

34. We would also have to discuss the development of fast breeder reactors, a necessity for all countries with limited uranium resources.

35. Thus, the content of fluorine and uranium in buried bone gradually increases, and can be measured in the laboratory.

36. The left's only significant victory came when delegates voted to reject any expansion of the current limit of three uranium mines.

37. Researchers, however, are less concerned about radioactivity than the toxic nature of depleted uranium, a heavy metal.

38. In the uranium mines, workers breathe in radioactive dust as they dig out the metal ore which contains the valuable element.

39. Depleted uranium, one of the hardest metals known, is classified as low-level nuclear waste.

40. In a power the uranium fuel is normally stacked in disks and contained in fuel rods.

41. Uranium has two radioactive isotopes[sentencedict.com], each of which decays to an isotope of lead and helium.

42. Experts believe the contamination is the result of a vein of naturally occurring uranium.

43. The reactor has been redesigned to run on low enriched uranium and its capacity upgraded from 5 to 10 megawatts.

44. The gas, which seeps out of the earth from underground uranium deposits, can collect in dangerous concentrations in some houses.

45. Uranium shutters, that shield the cobalt radioactive source until the patient is in position, were found to be crumbling.

46. Reprocessing is a highly technically demanding and extremely expensive operation, involving the extraction of uranium and plutonium from the spent fuel.

47. This means, for instance, that only the uranium isotopes are present in waters that seep into limestone caves. Sentencedict.com

48. Uranium, selenium and calcium are concentrated in cell walls whereas bismuth and sulphur are concentrated within the cells.

49. Mineralisation within the nodules consists of uranium, vanadium and iron oxides with base metal sulphides.

50. During the campaign against uranium mining, the legitimacy of the central state was constantly challenged.

51. Potassium turns into argon, uranium into lead, rubidium into strontium.

52. The government intends to publish a plan by the end of April for closing down all of the country's uranium mines.

53. The cliff contains pitchblende veins that have been sources of dissolved uranium.

54. The move is needed to secure profitability which has fallen due to world-wide over capacity in uranium enrichment.

55. The mass of uranium soon becomes so hot that it melts and disperses, a phenomenon called meltdown.

56. Harmful quantities of radiation are also released both before and after the uranium fuel enters the power station.

57. Buildings can be seen that may be associated with two techniques for uranium production: gas centrifuge and laser separation.

58. The doctors there know all about uranium and radioactive dust.

59. Its atomic properties turned out to be virtually identical with the Murmansk uranium.

60. Over the same period, research on advanced nuclear reactors will be eliminated and one of the two uranium enrichment plants closed.