If you observe a reading in counts per minute, you are measuring what?

If you observe a reading in counts per minute, you are measuring what?

• A. The dose equivalent
• B. The contamination level
• C. The exposure time
• D. The energy of radiation

Answer: (B)

Counts per minute shows how many radioactive events the detector picks up each minute. That rate reflects how much radioactive material is present in the area being surveyed, i.e., the level of contamination on surfaces or in the environment. It doesn’t directly measure dose to a person, the exposure time, or the energy of the radiation. So a reading in counts per minute is a readout of contamination level—the amount of radioactive material detected.

Counts per minute shows how many radioactive events the detector picks up each minute. That rate reflects how much radioactive material is present in the area being surveyed, i.e., the level of contamination on surfaces or in the environment. It doesn’t directly measure dose to a person, the exposure time, or the energy of the radiation. So a reading in counts per minute is a readout of contamination level—the amount of radioactive material detected.