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This shows the decay of the ⁶⁴Cu isotope (second column) as a function of time in hours (first column). Data from "Data analysis in the undergraduate nuclear laboratory" by B. Curry, D. Riggins, and P. B. Spiegel, American Journal of Physics, Volume 63, 1995, 71-76; Table 1 page 73.

1st col	2nd col
0	16744
1	15596
2	15120
3	14325
4	13723
5	12788
6	12141
7	11277
8	10949
9	10174
25	4317
26	4181
27	3784
29	3454
30	3184
31	3177
32	2910
33	2766
34	2598