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Resources: Radioactive Isotope Half-Life Table

Radioisotope Half-Life
Calcium - 45 (45Ca) 162.7 days
Carbon - 14 (14C) 5730 years
Chromium - 51 (51Cr) 27.8 days
Hydrogen - 3 (3H) 12.35 years
Iodine - 125 (125I) 60.14 days
Iron - 59 (59Fe) 44.5 days
Manganese - 54 (54Mn) 312.5 days
Phosphorus - 32 (32P) 14.29 days
Phosphorus - 33 (33P) 25.3 days
Sodium - 22 (22Na) 2.6 years
Sulfur - 35 (35S) 87.39 days