Abstract
X-ray microbeam transport in radiophotoluminescent (RPL) glass was examined by fluorescence microscopy. A silver-activated phosphate glass dosimeter plate was irradiated with an X-ray microbeam emitted from a 50 kV micro focus X-ray tube equipped with a glass capillary. A RPL region (wavelength; ∼650 nm) was observed with UV light excitation along the X-ray microbeam track in the glass dosimeter plate. The divergence of the RPL track was small owing to the X-ray energy dependence of the divergence of the microbeam, which was determined from the critical angle of the X-ray reflection on the inner wall of the glass capillary. The image of the RPL track was analyzed using photon transport and light trace simulation codes. It was confirmed by comparison between the RPL observation and simulation results that the RPL image in the silver-activated phosphate glass accurately projected the energy-deposited track along the X-ray microbeam.
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