Homework Help: Chemistry

Posted by Jane on Saturday, November 27, 2010 at 4:04pm.

The following isotopes (listed with their half-lives) have been used in the medical and biological sciences. Arrange these isotopes greatest to least decay activity. (Use the appropriate <, =, or > symbol to separate substances in the list.)

^3H (12.2 years)
^24Na (15 years)
^131I (8 days)
^60Co (5.3 years)
^14C (5730 years)

Chemistry - DrBob222, Saturday, November 27, 2010 at 4:14pm
This looks easy enough. Wouldn't you think the one with the greatest decay rate (8 days) would be first and the one with the longest decay rate (5,730 years) would be last?
Chemistry - Anonymous, Friday, April 12, 2013 at 9:18am
^60Co < ^131I < ^3H < ^24Na < ^14C

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