Question

A detector of radioactivity in a laboratory indicates an average of 16 counts /min when no radioactive samples are present. A radioactive sample of half-life 1.5 days is placed close to the detector, which indicates a count rate of 208 counts /min. Calculate the count rate that is indicated 6 days later.

Please fast and correct replies

Answer 1

I have no idea for this question but second answer tell me first plz mark as brainlist answer

Answer 2

Answer:

12 counts/ min

Explanation:

First, find how many half-lives will happen in 6 days; 6/ 1.5 = 4 half-lives.

Then you have to subtract 16 from 208. to get the sample's count rate per min, you'll get 192

*Divide 192 by 2^4 ( dividing by 2 to get half, and since 4 half-lives are taking place, you will take it as the power )

= 192/16 = 12 count/min

I hope this helps!

edit: I just realized this was a year ago, sorry :/