IBA Techniques

The CMAM has two gamma rays detectors. One is a Canberra germanium detector of the REGe type (reverse electrode germanium) 61 mm diameter by 61.5 mm thickness, berillium window 500 microns working range from 5 keV to 10 MeV (see gamma spectrum above). The nominal efficiency and resolution of the detector are 38% and 2.0 keV for 1.33 MeV, respectively. The second one is a 50.8mm diameter by 50.8mm thickness lantanum bromide scintillator (LaBr3) with an aluminium case of 500microns. Resolution 2.7% @ 662 keV (137 Cs Source). See gamma spectrum below:

   A gamma ray spectrum produced by PIGE on a soda-lime glass and in a LaBr3 scintillator

The REGe detector can be used in vacuum (the crystal nose only) in the standard beam line placed at an angle of 135° to the beam axis, or in air, associated to the PIXE and RBS detectors, on the external microbeam line. The LaBr3 has so far been used in the external microbeam line but could be adapted, since it is compact and lightweight, to other beamlines in air or in vacuum (the crystal only).

Click to read a short description about PIGE technique.