44 Radioactive Materials Safety Manual Environmental Health and Safety Appendix I - Guidelines for the Safe Use of Radionuclides 3H – Tritium....................................................................................... 45 14C – Carbon-14. ............................................................................... 46 32P – Phosphorus-32........................................................................ 47 33P – Phosphorus-33........................................................................ 49 35S – Sulfur-35................................................................................... 50 51Cr – Chromium-51. ........................................................................ 51 55Fe – Iron-55. ................................................................................... 52 59Fe – Iron-59. ................................................................................... 53 99mTc – Technium-99m...................................................................... 54 125I – Iodine-125................................................................................. 55 131I – Iodine-131................................................................................. 57
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