The nucleus 22Na undergoes B+ decay with a half life of 2.6 years (note: 1 year = 3.2 x 107 seconds). You start out with a sample of 22Na with an activity of 3.0 x 10 4 Bq. After two half lives (5.2 years), what is the activity of your sample?
Ans. |ΔN/Δt| = ?
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