COMPOSITE TANTALATE OF RARE-EARTH ELEMENTS Russian patent published in 2012 - IPC C01G35/00 A61K49/04 C30B29/30 

FIELD: chemistry.

SUBSTANCE: invention relates to novel chemical compounds and can be used in medicine, particularly radiology as an X-ray contrast agent during X-ray examination of various organs. The invention discloses a composite tantalate of rare-earth elements with the formula M_1-xM'_xTaO₄, where 0.01≤x≤0.45; M and M' are elements selected from a group consisting of: yttrium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, as a contrast agent for X-ray diagnosis. The disclosed contrast agent, which provides a high level of X-ray absorption, enables to smoothly and continuously vary the level of absorption with the same quantitative content of the agent owing to change in values of x, i.e., owing to change in the ratio of atoms the first and second elements in the crystal lattice of tantalate.

EFFECT: contrast agent broadens the possibility of reliable diagnosis of cavernous organs.

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