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31 This substance is so radioactive that it glows in the dark.

32 No coherent policy on radioactive waste disposal.

33 Around half the country's radioactive waste is stored there.

34 Another natural hazard is radioactive material.

35 How much radioactive dust is in my body?

36 These elements are major sources of radioactive heating.

37 Antimatter is also produced by radioactive decay.

38 Plumes of radioactive smoke were billowing around the helicopter.

39 Some of the fission fragments are themselves radioactive.

40 Operator errors allowed the radioactive core to overheat.

41 The nuclear industry produces waste streams which contain a variety of radioactive metal ions, the extraction of which minimises radioactive discharges.

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

43 What geophysicists have been lacking is a way to measure the temperature deep down, where radioactive heating plays a lesser role.

44 The odds against radioactive contamination, Nasa told the court, are 2,500 to 1.

45 It was closed and capped in 1977 after an explosion inside it showered the area with radioactive material.

46 The provinces are drawn on the basis of radioactive ages.

47 But potassium itself is one of the most important radioactive heat sources in the planets.

48 Radon, a naturally-occurring radioactive gas, is formed in the earth from the decay of minute amounts of uranium.

49 This is a dating method based on the radioactive decay of isotopes of uranium.

50 Like all types of radioactive decay the process takes place at a constant rate, independent of all environmental conditions.

51 The nations augmented the prohibitions in 1993 with a voluntary moratorium on disposing of low-level radioactive waste.

52 The men breathe air that is filtered to remove any radioactive dust,[http://sentencedict.com/radioactive.html] nerve gases or biological toxins.

53 They've been injected with plutonium in an effort to find out exactly how the radioactive substance affects people.

54 He developed a detector for decays of carbon-14, a radioactive form of carbon, that can be used to this end.

55 This helium produced by radioactive decay, called radiogenic helium, consists of pure 4He.

56 It contains a mass of radioactive byproducts spawned during its time in the reactor, some of them extremely hazardous.

57 This would have resulted in more radioactive material being released.

58 Asteroids contain a variety of rare radioactive isotopes of potassium, uranium, thorium, rubidium, and so on.

59 Rubbish litters our countryside, toxic fumes are belched into our air and radioactive discharge pollutes our seas.

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