Phosphorous-32 has a half life of 14.3 days. A 30-count sample is stored for 114.4 days. How much radiation remains in the original sample?
After 114.4 days, the count will be 0.117.
The formula for calculating the amount remaining after a number of half-lives,
#color(blue)(|bar(ul(A = A_0/2^n )|)#