# 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?

##### 1 Answer

Mar 7, 2016

After 114.4 days, the count will be 0.117.

#### Explanation:

The formula for calculating the amount remaining after a number of half-lives,

#color(blue)(|bar(ul(A = A_0/2^n )|)#

where