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Use the following table to determine how long a sample of titanium-44 would need to be stored until it would be considered safe.

Isotope Half-life
carbon-11 20.334 minutes
radon-222 3.8235 days
iodine-131 8.02 days
sodium-22 2.602 years
titanium-44 63 years
carbon-14 5,730 years

NOTE: Data for this table were taken from "List of Radioactive Isotopes by Half-life." Wikipedia. Wikimedia Foundation, 2 Feb. 2016. Web. 08 Feb. 2016. <https://en.wikipedia.org/wiki/List_of_radioactive_isotopes_by_half-life&gt;

A

31.5 years

B

630 years

C

315 years

D

63 years

E

63 days

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