FIELD: medicine, pharmaceutics.
SUBSTANCE: invention refers to an X-ray agent for X-ray diagnosing of various organs. The declared agent contains 2.0-9.0 wt % of tantalate in the form of nanoparticles of average size 5 nm of at least one element specified in a group consisting of yttrium, lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, or bismuth, 0.3-1.2 wt % of natural polysaccharide and water.
EFFECT: invention provides high contrast ratio within the whole range of X-ray powers applied in medical X-ray diagnosing (10-100 keV) and having high sedimentation stability.
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