Is the word radioactivity imply rate or concentration?

[nabilesmail]

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I pretty much got a problem on a GS FL that asks for the graph of radioactivity vs. time.

I chose the graph that is a generic graph for rate vs. time and they chose the graph that is generic for 1st order of conc. vs time.

I thought radioactivity meant rate though :/

 

[MedPR]

Radioactivity on the MCAT usually has to do with half life. The concentration is going to decrease over time.

 

[Testosterone]

Radioactivity can be plotted as both a function of concentration or rate versus time. In first order decay, concentration will decrease exponentially and rate will decrease linearly as time increases.