Semi finished products made of tungsten doped silver alloy with tungsten content ≥ 80% (silver content ≥ 2%), which can be machined into any of the following products: cylindrical shapes with diameter ≥ 120mm and length ≥ 50mm; Pipes with inner diameter ≥ 65mm, wall thickness ≥ 25mm, and length ≥ 50mm; Blocks with dimensions ≥ 120mm × 120mm × 50mm