The target material for X-ray tubes has a high atomic number and a high melting point. Which statement best describes this material?

The target material for X-ray tubes has a high atomic number and a high melting point. Which statement best describes this material?

• A. Low melting point and low atomic number
• B. High electrical resistance
• C. Low density
• D. High atomic number and high melting point

Answer: (D)

The target in an X-ray tube must both produce X-rays efficiently and withstand the intense heat it generates. A high atomic number increases the likelihood and energy of X-ray photons produced when the incoming electrons interact with the target (through bremsstrahlung and characteristic radiation), making the output more efficient. A high melting point ensures the material remains solid and structurally intact under sustained exposure, preventing damage or deformation of the anode. So the best description is a material with both a high atomic number and a high melting point. Descriptions that emphasize low melting point, low atomic number, or irrelevant properties like high electrical resistance or low density don’t meet these critical requirements.

The target in an X-ray tube must both produce X-rays efficiently and withstand the intense heat it generates. A high atomic number increases the likelihood and energy of X-ray photons produced when the incoming electrons interact with the target (through bremsstrahlung and characteristic radiation), making the output more efficient. A high melting point ensures the material remains solid and structurally intact under sustained exposure, preventing damage or deformation of the anode. So the best description is a material with both a high atomic number and a high melting point. Descriptions that emphasize low melting point, low atomic number, or irrelevant properties like high electrical resistance or low density don’t meet these critical requirements.