Actually nevermind, I found the answer:
Half-life; 28.8 years. You can find the half-life of a substance by dividing the anount at one point in time by the amount remaining afterwards. Then multiply the elapsed time by the common log of 2 and by the amount of time that has gone by. Next just divide the number calculated in step 3 by the number in step 2.
Can anyone help me find the half-life of strontium-90? I also need an explanation on how to do it. Thanks!!
Radioactive Decay of Strontium-90:
At 0 years: 100% remaining
At 28 years: 50% remaining
At 56 years: 25% remaining
At 84 years: 10% remaining
At 112 years: 5% remaining.
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