A61K49/1803

Biomedical materials

A synthetic calcium phosphate-based biomedical material comprising gadolinium. The material may comprise a compound having the general chemical formula: Ca.sub.10yGd.sub.y(PO.sub.4).sub.6x(SiO.sub.4)x(OH).sub.2x+y where 0<x<1.3 and 0<y<1:3.