Mirion’s germanium detectors use a p-i-n structure sensitive to X-rays and gamma rays. Under reverse bias, an electric field forms across the intrinsic region, sweeping charge carriers (holes and electrons) to the p and n electrodes when radiation interacts with the detector. The charge generated is proportional to the photon energy and converted into a voltage pulse by an integrated preamplifier.
Due to the low band gap of germanium, these detectors require cooling to reduce thermal noise. Liquid nitrogen at 77 K is typically used, with the detector housed in a vacuum chamber to protect against contaminants.
Mirion offers a wide range of detector options, utilizing both p-type and n-type germanium, with advanced contact technologies like diffused, implanted, and barrier contacts to suit diverse applications. Our detectors cover various energy ranges and performance needs.
