Gamma spectroscopy involves the spectroscopy of radionuclides using a detector, electronics to collect and process the signals produced by the detector and a computer with processing software to generate, display and store the spectrum. This requires high purity rare gases, e.g. SPECTRA Dark Matter Xenon. Most radioactive sources produce gamma rays of various energies and intensities. When these emissions are collected and analyzed with a gamma spectroscopy system, a gamma energy spectrum can be produced. A detailed analysis of this spectrum is typically used to determine the identity and quantity of gamma emitters present in the source. The gamma spectrum is characteristic of the gamma-emitting nuclides contained in the source, just as in optical spectroscopy, the optical spectrum is characteristic of the atoms and molecules contained in the probe.