Sensitive detectors
The extreme sensitivity of radiation detectors is illustrated by the ‘energy spectrum’ of the gamma photons emitted in this sample of radioactive matter. Modern germanium-based detectors capable of measuring also the gamma energies with great precision, display the ‘characteristic rays’ emitted by different elements. Given the extremely high counts that are measured, one can observe the characteristic rays of elements present in very trace quantities, such as caesium 134.
IN2P3