Plastic High Purity Ge Three Crystal Electron-Pair Spectrometer

A three Crystal pair spectrometer is built up using a high parity De(HPGe) as central detector and two plastic annular scintillators as the outside detector. The ratio of the ²⁴Na 2.754MeV γ roy double escaping peak to adjacent continual background is 8.6 when detected with the HPGe only but is 430 when detected with the Pair spectrometer, the artual improvement factor is 50.