Characteristisation of a new multiple channel analyzer - linearity

Due to the large difference~ in purchasing value of a new 32 channel Mesitec ADC and more traditional ADCs, we tested the non-linearity properties of a 32 channel ADC in order to determine its potential use with our Ge array of detectors (GEORGINA). We used a single 109{\%} efficiency germanium (Ge) detector to obtain a $\gamma $-ray spectrum from a calibration source of 152Eu. We checked the linearity against voltage for 32 separate settings. With a linear fit, we get a non-linearity range of 0.6keV over 100-1400keV energy range. This non-linearity reduces to 0.1keV with a second order fit over the same range of energy. This level of non-linearity makes the module useful and usable for $\gamma $-ray spectroscopy.