A component of a portable survey meter or stationary radiation monitor used to measure radioactive emissions. It includes a variety of designs and configurations consisting of a crystal or other form of scintillation material, a photomultiplier tube, a light reflector, light "pipes" that transmit the light to the photomultiplier tube, and a connector to attach it to the survey meter. The composition and size of the scintillation material determines the energy discrimination capabilities of a scintillation probe design and defines the kind of radiation, e.g., x-ray, gamma ray, high-energy beta particles or neutrons, that can be detected.