- Radiation energy detected by some devices is registered as a "count."
- Devices detect only a percent of the total energy (radioactive decays or disintegrations) released by radioactive material.
- Efficiency: the percentage of the total radiation energy released that is detected by a device
- Appropriate "efficiency" conversion factors can be used to
- Determine the actual number of disintegrations per second or minute (DPS or DPM)
- Actual disintegrations per unit of time are measured in units of curies or becquerels
- Example
- [CPM] divided by [efficiency] equals DPM
- Example: 100 CPM at 20% efficiency = 100/0.2 = 500 DPM
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