High Purity Germanium Detector (HPGe)
HPGe is the best detector for gamma-ray spectroscopy, with a resolution <0.3%. HPGe detector is similar to a PN diode, where a bias voltage (several kV) creates a depleted region. This region is sensitive to ionizing radiations, especially X-ray and gamma ray. When a high energy photon from such radiations interact with the material in …