Radioactive Substance Half-Life Decay Rate, k 21. Tritium 5.5% per year = -0.055 22. Krypton-85 6.3% per year = -0.063 23. Radium-226 1620 years 4560 years 17.5 days 24. Uranium-238 25. Arsenic-74 26. Calcium-47 113 hours

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