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The CDEX (China Dark matter Experiment) now deploys ~10 kg pPCGe (p-typePoint Contact Germanium) detectors in CJPL (China Jinping UndergroundLaboratory). It aims to detect rare events such as dark matter and 0vbb(neutrinoless double beta decay). The discrimination of bulk and very bulkevents are essential for improvements of the analysis threshold of dark matter.Very bulk events are generated near the p+ point surface of pPCGe, which areusually from radioactive materials of electronic devices. Due to differentlocations of charge collection, bulk and very bulk events have different pulseshape. This paper will present two linear PSD (Pulse Shape Discrimination)methods: CCM (Charge Comparison Method) and Fisher's LDA (Linear DiscriminantAnalysis), to realize the discrimination of bulk and very bulk events. Theresults show that FOMs (Figure of Merit) are 1.38 $\pm$ 0.33 and 1.62 $\pm$0.18 by CCM and Fisher's LDA respectively.

Pulse Shape Discrimination of Bulk and Very Bulk Events within HPGe Detectors