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