Radioactive decay of cesium

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Reference no: EM13111707

Following a terrorist release of Cesium-137 (half-life of 30 years) in downtown, clean up efforts were successful in removing all but 100 curies. How long will it take for the contamination to decay to about 5 curies?

A. 90 years
B. 130 years
C. 175 Years
D. 215 years

Reference no: EM13111707

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