How to Calculate a Half-Life

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Presentation transcript:

How to Calculate a Half-Life An isotope of cesium (cesium-137) has a half-life of 30 years. If 1.0 grams of cesium-137 desintegrates over a period of 90 years, how many grams of cesium-137 would remain?

Solving the Problem: An isotope of cesium (cesium-137) has a half-life of 30 years. If 1.0 grams of cesium-137 desintegrates over a period of 90 years, how many grams of cesium-137 would remain?

Half-Life Practice problems Iodine-131 is used to destroy thyroid tissue in the treatment of an overactive thyroid. The half-fife of iodine-1 31 is 8 days. If a hospital receives a shipment of 200 g of iodine-131, how much Iodine- 131 would remain after 32 days? Mercury -197 is used for kidney scans and has a half-life of 3 days. If the 32 grams of mercury-197 is ordered, but takes 15 days to arrive, how much would arrive in the shipment?