A radioactive waste from a clinical laboratory contains 0.2 Ci (microcuries) of calcium-45 (45Ca) per liter. The

A radioactive waste from a clinical laboratory contains 0.2 μCi (microcuries) of calcium-45 (45Ca) per liter. The half-life of 45Ca is152 days.

a. How long must this waste be stored before the level of radioactivity falls below the required maximum of 0.01 μCi/L?

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