Why is beryllium useful in X-ray equipment?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — alkaline-earth metal Modern version of the periodic table of the elements (printable).

Beryllium is highly valued in the construction of X-ray equipment primarily due to its low atomic weight. This property allows the metal to transmit X-rays 17 times more effectively than aluminum, making it an ideal material for the windows of X-ray tubes.1

Additionally, beryllium oxide is utilized in X-ray equipment as a component in phosphors.2