Nuclear Instrumentation and Detection
Detecting Nuclear Radiation
Detector principles
Nuclear detectors convert ionization, scintillation, semiconductor charge collection, or track formation into measurable signals. Different detector types trade off energy resolution, efficiency, timing, and radiation hardness.
Detector types
| Detector | Main use |
|---|---|
| Geiger-Müller tube | Simple radiation counting |
| Scintillator | Fast timing and gamma detection |
| Semiconductor detector | High energy resolution |
| Cloud chamber | Visualizing particle tracks |
Energy resolution
Better resolution means two nearby spectral lines can be separated more easily, which is crucial for identifying isotopes and decay schemes.
Common observables
Which detector type is known for high energy resolution in gamma spectroscopy?
Semiconductor detectors, such as high-purity germanium detectors, offer excellent energy resolution.
Correct answer: Semiconductor detector
What physical process inside many detectors creates the measurable signal?
Ionization or excitation produces charge or light that can be measured.
Correct answer: ionization
What does detector efficiency measure?
Efficiency quantifies how much of the emitted radiation is actually detected.
Correct answer: Fraction of emitted radiation that is registered
Why is background subtraction important?
Background can obscure weak peaks or low-rate decays.
Correct answer: to isolate true nuclear events from unrelated counts