What term is used to describe an x-ray beam that diverges equally in all directions?

The term used to describe an x-ray beam that diverges equally in all directions is "isotropic." This concept is important in radiography and physics, as it refers to a type of radiation emission or wavefront that has the same intensity and properties in all directions. When an x-ray beam is isotropic, it ensures uniform exposure across the imaging area, which is critical for accurate diagnostics and quality images.

In contrast, the term "anisotropic" signifies that different directions may exhibit varying properties, which does not apply to the isotropic nature of the x-ray beam in this context. "Monoenergetic" describes a beam that contains x-rays of a single energy level, while "polyenergetic" refers to a beam with multiple energy levels. Neither of these terms addresses the directional properties of the beam, making "isotropic" the appropriate choice for a beam that diverges evenly in all directions.