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After 1.6 seconds, 0.6 g astatine-218 remains unchanged. This amount is reduced by half to 0.3 g at 3.2 seconds. It is halved again at 4.8 seconds to 0.15 g, and halved once more to 0.075 g unchanged after a total of 6.4 seconds.
It disintegrates into its daughter nuclei that are much more stabler than the radioactive nuclei. If a sample of radioacictive material is left it will decay into another element over a period of time. Note that complete decay is not possible. A fraction of the original radioactive material will always remain in the sample.
One sixteenth of a gram. 1st halflife- 1/2 gram 2nd, 1/4 3rd 1/8th 4th halflife, 1/16th
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The answer depends on 3240 WHAT: seconds, days, years?
50 mg
Approx 1/8 will remain.
1.5% remains after 43.2 seconds.
5g would remain
Substance in the material Remain the same
Peat would remain largely unconsolidated. Mudstone is a rock.
1mg
I suppose that you think to the radioactive isotope Cs-17; After 4 years remain 9,122 g.
2
0.5 mg
.25 mg