井戸型Ge検出器における宇宙線バックグラウンドの低減化

抄録

An anticoincidence shielding has been developed for a low-background well-type Ge detector. The detector in a heavy lead shielding was surrounded by plastic scintillators to reduce background produced by cosmic rays. Background counting rate in the energy range 40 keV to 3 MeV was reduced to 1/2.2 at anticoincidence mode. An example of low-level γ spectrometry utilizing this detector assembly is given.