AQA GCSE Combined Science Trilogy · 8464
Specification 6.4.2.1, 6.4.2.3 · Paper 5
The number of decays recorded each second by a detector, expressed as counts per second.
Revise: Radioactive Decay and Radiation TypesCount-rate is the number of decays recorded each second by the detector. Activity describes what happens in the source; count-rate describes what is detected.
- Revise: Half-Lives and Radioactive Decay
The number of radiation detections recorded by a detector per unit time. It is not necessarily equal to the source’s activity because not all emitted radiation is detected.