Multiple choice

If a radioactive sample shows a value of 134503 count per minute (cpm), and the efficency is 98.8, what will be the actual radioactivity of the sample?

  1. 136136.6 disintegration per minute (dpm)

  2. 134503 disintegration per minute (dpm)

  3. 1361.366 disintegration per second (dps)

  4. 1361.366 count per minute (cpm)

  5. Value cannot be determined

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Disintegration per minute (dpm) = cpm/efficency = 134503/98.8*100 = 136136.6dpm.