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{:("1.Natural radioactivity", (a) 3.7 xx...

`{:("1.Natural radioactivity", (a) 3.7 xx 10^(10) "decay / second"), ("2. Artificial radioactivity", "(b) spontaneous process"), (3. "1 curie", (c) 10^(6) "decay / second"),(4. "1 Rd (Rutherford)" , "(d)induced process"):}`

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1. (b) spantaneous process 2. (d) induced process 3. (a)` 3.7 xx 10^(10) "decay / second"` 4. (c) 10 decay / second
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