Michal Platkevic

Publications (3)0 Total impact

• Article: Tracking and Radiation Field Measurement with Pixel Detectors

  Zdenek Vykydal, Carlos Granja, Jan Jakubek, Michal Platkevic, Stanislav Pospisil
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  ABSTRACT: Continuous advances in the miniaturization of semiconductor technology allow nowadays fabrication of devices with performance exceeding the photographic techniques (nuclear emulsion). Single particle counting pixellated detectors open up a whole new field of possibilities in real‐time detection and visualization of radiation and understanding its interaction in matter. Pixel detectors allows to visualize directly the ionization paths of different types of radiation, with additional energy and time information, even at very low fluxes which can be used for reconstruction of the incident radiation field.
  AIP Conference Proceedings. 01/2010; 1204(1):70-74.
• Article: Detection and Real Time Spectroscopy of Charged Particles with the TimePix Pixel Detector

  Carlos Granja, Jan Jakubek, Michal Platkevic, Stanislav Pospisil, Zdenek Vykydal
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  ABSTRACT: We tested the position—, spectral— and time—resolution capability of the TimePix semiconductor detector together with the USB readout interface and Pixelman control and DAQ software tool for detection and visualization of particles. Event—by—event spectroscopy can be achieved by real time analysis of the characteristic tracks and specific response of different radiation in the pixel detector.
  AIP Conference Proceedings. 01/2010; 1204(1):75-79.
• Conference Proceeding: Event by event energy sensitive imaging with TimePix pixel detector and its application for gamma photon tracking

  Jan Jakubek, Andrea Cejnarova, Michal Platkevic, Jaroslav Solc, Zdenek Vykydal
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  ABSTRACT: The semiconductor pixel detector TimePix is a newly developed successor of the Medipix2 device. Each TimePix pixel is provided with a preamplifier, a discriminator and a counter. Each counter can be configured to work in one of three principal operation modes: 1. counting of detected particles; 2. measurement of particle energy; 3. measurement of time of interaction. All these features can be advantageously exploited in the field of medical and material sensitive imaging using various radiographic techniques. Regardless of the high performance of the TimePix device, its quality suffers from the charge sharing effect which derogates the detector’s energy sensitivity and decreases its spatial resolution. Nevertheless, it has been already demonstrated that the influence of this effect can be not only effectively suppressed but even utilized to gain more complex information from the measurement. The technique consists in the independent processing of each event of particle detection separately (event-by-event mode). The TimePix device can be operated in triggered mode and, moreover, it can also generate the trigger (using so called back-side pulse). All these features allow the construction of an enhanced multilayered Compton Gamma Camera with very high detection efficiency of about 10% which is several orders of magnitude higher than the efficiency of collimator (pin hole) based systems. Such camera has great applicability in the fields of nuclear medicine (SPECT) and homeland security. This article presents in its introduction a summary of experimental results verifying the potential of the TimePix device operated in event-by-event mode applied in several imaging techniques (material sensitive X-ray transmission radiography, X-ray fluorescence imaging). In the second part, a proposal of a new multilayered Compton Gamma Camera (Tracker) will be showed together with its Monte-Carlo simulations as well as results of preliminary experiments verifying its functiona- - lity.
  Nuclear Science Symposium Conference Record, 2008. NSS '08. IEEE; 11/2008