Speaker
Description
An extensive examination and detailed changes of the primary radiation (before the shielding) and the transmitted field (after the shielding) are directly measured and accurately evaluated in terms of radiation composition (particle species, production of secondary radiation), dosimetry (dose rates), spectrometry (energy loss, LET spectra), position/beam size and direction. The technique makes use of the high-resolution pixel detectors Timepix together with developed high-resolution radiation-imaging and spectral-sensitive particle-tracking techniques. Measurements are carried out at a wide range of particle accelerator beams (electrons, protons, ions), radiation sources (X rays, gamma rays) and newly also neutron sources (radionuclide, nuclear reactor, accelerator based) in Czech Republic. Data and results measured with composites (CFRP, GFRP) for spacecraft and nuclear shielding materials (Al, Pb, Ta) are presented (see figure) for energetic electrons and protons (tens of MeV) present in LEO orbit. The figure shows the technique experimental setup (top left) and the spatial visualization of the radiation field (14 mm x 14 mm = 2 cm2) of a parallel 30 MeV proton beam (bottom left) after four different shieldings (CFRP, GFRP, Ta, Pb). The integral deposited energy is displayed by the color bar (in log scale).