ASRT Practice Exam 2025 – Complete Study Resource

Tungsten is essential for the function of an X-ray tube due to its unique properties that make it particularly suitable for producing X-rays. It has a high atomic number (74), which maximizes the efficiency of the X-ray production process. The atomic structure of tungsten allows it to efficiently convert kinetic energy from electrons into X-rays when they collide with the metal target within the tube.

Additionally, tungsten has a high melting point of about 3,422 degrees Celsius, which is crucial because the target area of the X-ray tube experiences extreme temperatures when electrons strike it. This high melting point ensures that tungsten can withstand the heat generated during the X-ray production process without degrading or melting.

These attributes make tungsten the optimal choice for the anode material in an X-ray tube, facilitating effective imaging while maintaining integrity over time. Other materials such as lead, gold, and silver do not possess the same combination of high melting point and atomic number, making them less suitable for this specific application in X-ray technology.