Asked Nov 14, 2019

Gadolium-153, which is used to detect osteoporosis, has a half life of 242 days. What percentage of the Gd-153 is left in the patient's system after 2 years (730 days)?


Expert Answer

Step 1

Radioactive decay follows first order kinetics.

Equation for half life, t½ = ln2 / k

Therefore k = ln2 / t½ = ln2/242 day...

kt In
Agiitialcon centration
A amount left after timet

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AO kt In A Where, Agiitialcon centration A amount left after timet


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