Observation of X-ray and Auger electron spectra in a 4π proportional counter for 4π(e, X)-γ coincidence measurements

In the measurements, we employed a pill-box type 4π counter in which the anodes were very thin gold-coated tungsten wires (30 μm ∅). In this system, spectra down to 0.2 keV were clearly seen. The gas pressure can be raised up to 0.6 MPa. Counting electronics used for 4π(e, X)-γ coincidence measurements were conventional modules and a list mode two-parameter data acquisition system.