What is an anode made of in dental radiography?

In dental radiography, the anode is primarily made of a tungsten target set in a copper block. The tungsten is used for the target because it has a high atomic number and an excellent ability to withstand the heat generated during the process of X-ray production. When electrons from the cathode collide with the tungsten target, they generate X-rays effectively while maintaining a stable temperature.

The copper block serves an essential role in dissipating heat away from the tungsten target, preventing overheating and ensuring that the X-ray machine operates efficiently. This combination allows the dental X-ray unit to produce high-quality images while minimizing damage to the equipment from heat.

The other options do not provide suitable materials for the anode in dental radiography, as they either lack the necessary properties for heat resistance and X-ray production or do not relate directly to the anode's function in the radiographic process.