Radioactive decay, half-life and uses

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Question 64

Easy

Figure 1 shows how the activity of two radioactive isotopes, X and Y, changes with time.

Figure 1: Decay curves of isotope X and isotope Y.

Time (s)	Activity of Isotope X (Bq)	Activity of Isotope Y (Bq)
0	800	800
75	713	566
150	635	400
225	566	283
300	504	200
375	449	141
450	400	100

Use the data in Figure 1 to determine the half-life of isotope Y.

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