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HPGe Detector, Part I: Repair » HPGe_lowV_spectra

This graph and the next one illustrate the value of making observations of detector behavior at VERY LOW bias voltages, where damage potential from vacuum breakdown or leakage current is negligible. Even at a few hundred volts, classic features in the Cs-137 spectrum are evident: photopeak, Compton continuum, etc. Resolution improves most markedly with the first few hundred volts of bias. Also, presumably because of improved charge collection, the peak position shifts toward higher values as the voltage rises. But this effect is slight and becomes unnoticeable after the first few hundred volts are added.


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