What is the subtype of ionizing radiation used in CT scans?

In CT scans, the subtype of ionizing radiation used is X-ray photons. X-rays are a form of electromagnetic radiation that have the ability to penetrate various tissues in the body, making them ideal for imaging. When produced in a CT scanner, X-ray photons are emitted from a rotating x-ray source and directed toward the patient, passing through the body and being detected on the opposite side. This process creates cross-sectional images (slices) of the body, which can be reconstructed into a three-dimensional representation.

X-rays are preferred in this context because they have the appropriate energy levels to penetrate soft and hard tissues without excessive absorption or scattering, allowing for clear imaging. Other forms of ionizing radiation, such as gamma rays, alpha particles, and beta particles, have different properties and applications. Gamma rays are typically used in nuclear medicine and imaging but are not involved in standard CT imaging. Alpha and beta particles are more relevant in radiotherapy or radioactive decay processes, rather than for creating high-resolution diagnostic images of the internal structure of the body as is needed in CT scans.