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Which outcome increases within a decaying Cobalt-60 source?

A)Gamma photon emission intensity
B)Half-life lengthening over time
C)Nickel-60 atom concentration
D)Cobalt-60 decay constant value

💡 Explanation

Nickel-60 concentration will increase because Cobalt-60 undergoes beta decay into Nickel-60, therefore accumulating over successive half-lives rather than altering the decay rate. The decay constant is temperature-dependent.

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