how much cobalt-60 remains 15 years after it is initially made?cobalt-60 has half life 5.27

To calculate how much cobalt-60 remains after 15 years, we need to use the concept of half-life. The half-life of cobalt-60 is 5.27 years, which means that after each 5.27-year period, half of the initial amount of cobalt-60 will decay.

We can use the formula for exponential decay to find the remaining amount of cobalt-60 after 15 years:

Amount Remaining = Initial Amount × (1/2)^(Time / Half-Life)

In this case, the Time is 15 years, the Half-Life is 5.27 years, and we want to find the Amount Remaining.

Plugging in the values into the formula:

Amount Remaining = Initial Amount × (1/2)^(15 / 5.27)

To find the initial amount of cobalt-60, we would need additional information. If you have the initial amount, you can substitute it into the equation to calculate the remaining amount after 15 years.