Additional research pointed out that the reason for that dependency was that the radiation emitted in the direction of movement of particle included also X-ray frequencies.
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According to Wolfgang K. H. Panofsky and R. Wilson, Alikhanian made "very important contributions to science, in particular, in the use of transition radiation as an important tool in particle detection and identification".
PERDaix uses a time of flight system, a scintillating fiber tracker with SiPM readout, and a transition radiation detector in combination with a permanent magnet to measure particle fluxes.