Marker alloy

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A marker alloy for an implant made of a biodegradable metallic material, comprises : an alloy of magnesium, ytterbium and rare earth metals. A marker alloy for an implant made of a biodegradable metallic material, comprises : an alloy of the composition Mg xYb y(M 1) z (I). x : 10-60 atomic percent; y : 40-90 atomic percent; z : 0-10 atomic percent; M 1Ag, Zn, Au, Ga, Pd, Pt, Al, Sn, Ca, Nd, Ba, Si or Ge; x+y+z : contaminants caused by production, result in 100 atomic percent. INDEDEPENDENT CLAIMS are included for the the following : (1) production of an x-ray marker for an implant made of a biodegradable magnesium alloy involving : providing the marker alloy (I); and forming an x-ray marker for an implant made of a biodegradable magnesium alloy incorporating the marker alloy; and (2) an implant incorporating a marker alloy, comprising the composition (I).