In the context of this work a new detector concept based on monolithic CsI(Tl) scintillation crystals has been developed. This so-called intrinsic phoswich or shorter iPhos makes it possible to measure the kinetic energy of a particle without fully stopping them and simultaneously enables the selection of events which obtain a negligible amount of nuclear reactions. The fundamental principle is a new effect in the scintillation light of this long known scintillator material that was discovered within this thesis.
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