Electron spectrometer type 'Miniorange' for in-beam measurements

A new electron spectrometer type 'miniorange' developed in ATOMKI, Debrecen (Hungary) is described. The main components of the detector are Faraday reaction chamber, device for target moving, ring of permanent magnets, Si(Li) detector and auxiliary devices. Maximum efficiency of electron detection is about 10 in full peak. The energy range of electrons detected may be altered simply by moving the magnet ring and detector, without destroying the vacuum. The analysis of measured spectra of internal conversion electrons shows that the application of this simple, cheap and compact detector leads to a remarkable increase in the detection efficiency, of background radiation. (D.Gy.)