Question

1. Бета активний зотоп Sr-90 має період напіврозпаду 20 років. Яка частина початкової кількості ядер залишиться через 100 років ПОЖАЛУЙСТА

Answer 1

1/32
t = 100 р
T = 20 р
N0 - ?
N0 = 1/(2^(100/20)=1/(2^5)=1/32N

Answer 2

Calculating the Remaining Fraction of Nuclei after 100 Years for Sr-90

The remaining fraction of nuclei after a certain period of time can be calculated using the radioactive decay formula:

N(t) = N0 * (1/2)^(t/T)

Where: - N(t) = the remaining quantity of the substance after time t - N0 = the initial quantity of the substance - t = the elapsed time - T = the half-life of the substance

In this case, for Sr-90 with a half-life of 20 years, the formula becomes:

N(100) = N0 * (1/2)^(100/20)

Let's calculate the remaining fraction of nuclei after 100 years for Sr-90.