Which material is used for the x-ray target on the anode?

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Multiple Choice

Which material is used for the x-ray target on the anode?

The target on the x-ray tube’s anode must efficiently convert electron energy into x-rays while withstanding intense heat. Tungsten fits this need best: it has a very high atomic number, which makes x-ray production more efficient, and an exceptionally high melting point, so it won’t melt under the beam. It also handles thermal stress well, especially in rotating anodes where heat is spread over a larger area. Copper, while a good conductor of heat, would heat and melt too easily and has a lower atomic number, reducing x-ray production efficiency. Aluminum has an even lower atomic number and a lower melting point, making it unsuitable. Lead is excellent for shielding, not for serving as the x-ray target material.

The target on the x-ray tube’s anode must efficiently convert electron energy into x-rays while withstanding intense heat. Tungsten fits this need best: it has a very high atomic number, which makes x-ray production more efficient, and an exceptionally high melting point, so it won’t melt under the beam. It also handles thermal stress well, especially in rotating anodes where heat is spread over a larger area. Copper, while a good conductor of heat, would heat and melt too easily and has a lower atomic number, reducing x-ray production efficiency. Aluminum has an even lower atomic number and a lower melting point, making it unsuitable. Lead is excellent for shielding, not for serving as the x-ray target material.

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