Unformatted text preview: TY
SI O F YO R K U
IV When we first start, there's only radioactive Ni; none of it has decayed to Cu, so 100% of our Ni is in our
sample. Here we've shown this as a ratio between Ni and Cu over time. IB U TI O N
.P R O PE
R TY After 100 yr, half of our Ni sample has decayed and formed radioactive Cu.
We show this as having equal amounts of Ni and Cu (1:1). N O
R SA LE O R D IS TR After another 100 yr, our Ni sample is now 1/4 of it's original amount, and the other 3/4 has decayed to Cu.
We show this ratio as 1:3 - thus, Ni represents 1/4 of the sample (add the 1 and 3 together to get the total
number of "parts") ...
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