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-collimated configuration with mono-energetic proton beams of 165 MeV and 224 MeV, respectively. Results acquired by means of trans- versal PGS at different phantom depths, ranging from 6 cm before the Bragg peak (BP) to 3.5 cm beyond the BP in 5 mm steps with a 1 cm slit collimation (tungsten) showed a slight decrease of PG yields after the BP. Similar measurements with a semi-opened collimation configuration demonstrated a steeper decrease of PG yields after the BP. Keywords: cerium-bromide, prompt-gamma, time-of-flight, proton therapy, range verification, gamma

concentration, with significantly larger conductivity changes in the potassium bromide-rich region. The results are discussed in terms of possible complex formation. Key words: Cerium Bromide; Potassium Bromide; Phase Diagram; Electrical Conductivity; Differential Scanning Calorimetry. 1. Introduction The present work continues our research program on lanthanide halide-alkali metal halide systems. We focused our studies on these systems for two rea- sons: Firstly, rare-earth metals play a significant role in sophisticated industrial applications. Secondly, data on lanthanide

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