41. Several anionic technetium halides are known. 42. Elements heavier than lead, and the elements technetium and promethium, exist only as radionuclides. 43. Generally a triple phase technetium 99 based scan will show increased uptake on all three phases. 44. The primary decay product before 102 Ru is technetium and the primary product after is rhodium. 45. The injected substance, filtered sulfur colloid, is tagged with the radionuclide technetium -99m. 46. Difference images calculated from ictal and interictal technetium -99m-HMPAO SPECT scans of epilepsy. 47. The presence of splenic tissue may be confirmed with a technetium -99m sulfur colloid scan. 48. Except for technetium , the first 92 elements, from hydrogen to uranium, exist in nature. 49. The primary decay product before 102 Ru is technetium and the primary decay product after is rhodium. 50. Since that discovery, there have been many searches in terrestrial materials for natural sources of technetium .
