Generation of Medical X-ray and Terahertz Beams of Radiation Using Table-Top Accelerators

Theoretical and experimental studies of PXR and diffracted radiation of an oscillator in crystals combined with the development of VFEL generators with photonic crystals give a promising basis for creation of X-ray and THz sources using the same table-top accelerator. Multi-modal medical facility can be developed on the basis of one dedicated table-top electron accelerator of some tens of MeV energy. Such a system could find a lot of applications in medical practice and biomedical investigations.Comment: 7 pages, 1 figure, presented at Channeling2010, submitted to Il Nuovo Ciment

Plasticizer Effect on Dielectric and Relaxation Parameters of Xanthan

The dielectric and relaxation properties of pure and plasticized (with water, glycerol and PPG-200) xanthan were studied by  broadband dielectric relaxation spectroscopy. Within frequency range 10–107 Hz, a solid xanthan and its gels demonstrated two relaxation processes: the β-relaxation and relaxation of gel fragments formed due to xanthan/plasticizer interaction. The relaxation time decreased in the raw of plasticizers: PPG-200 > water > glycerol; the segmental dynamics of xanthan respectively grow. The ionic conductivity of gel samples increased in the following sequence:  water < PPG-200 < glycerol