31. It is labeled with a radioisotope, technetium -99m ( 99m Tc ). 32. Technetium -99m has several features that make it safer than other possible isotopes.33. Technetium stars belong to the classes variable stars of the long period variable types.34. :The obvious explanation is because non-metallic Technetium doesn't exist. 35. The actual separation of technetium -99 from spent nuclear fuel is a long process. 36. Technetium -99 is used as a gamma ray-free source of beta particles.37. Plutonium, neptunium, iodine and technetium decay much more slowly and are not strong emitters. 38. Many of technetium 's properties were predicted by Dmitri Mendeleev before the element was discovered. 39. Technetium -99 is used as a gamma-ray-free source of beta particles.40. Metallic technetium slowly tarnishes in moist air and, in powder form, burns in oxygen.
