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The half-life of 27Co60 is about 5.27 years. 15.8 years is 3 half-lives, so 0.53 or 0.125 of the original sample of 16 g will remain, that being 2 g.
5g would remain
I suppose that you think to the radioactive isotope Cs-17; After 4 years remain 9,122 g.
This time is 17 190 years.
2 1/2 g
The half-life of 27Co60 is about 5.27 years. 15.8 years is 3 half-lives, so 0.53 or 0.125 of the original sample of 16 g will remain, that being 2 g.
100g
5g would remain
The answer depends on 3240 WHAT: seconds, days, years?
I suppose that you think to the radioactive isotope Cs-17; After 4 years remain 9,122 g.
This time is 17 190 years.
2 1/2 g
2 1/2 g
2 1/2 g
100 grams
Approx. 313 grams
2 1/2 g