Answer :
The formula for calculating count rate is given as,
ln(counting rate at time t ) = ln(counting rate at t=0 ) - kt .
Definition of the count rate?
Count-rate is defined as the number of decays recorded each second by a detector, such detector as the Geiger-Muller tube. The illustration below shows that how a radioactive sample is decaying over time.
Calculation of count rate.
Total Count Rate = (2206 ± 21) counts/mm. 11208 = 106. To find the counts per minute, we divide by 5 (see the next section) to obtain 2206 ± 21, which becomes identical to what was found before. Note that the error taken was the square root of the count rate in 5 minutes.
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