Diagnostic "X-ray" radiation is classified as what type of LET radiation?

Diagnostic X-ray radiation is classified as low energy LET (Linear Energy Transfer) radiation. LET is a measure of the energy transferred by radiation as it travels through matter, specifically when considering charged particles. Low LET radiation, such as gamma rays and X-rays, interacts with matter primarily through indirect ionization. This means that instead of directly ionizing atoms, it creates secondary charged particles that then go on to cause ionization.

In the context of X-ray imaging, the energy levels typically range from about 10 keV to several hundred keV, which is considered low compared to high LET radiation such as alpha particles. High LET radiation transfers more energy in a shorter distance, leading to a greater biological impact per unit of dose. This distinction is crucial in radiation protection as it helps in assessing the relative biological risk associated with different types of radiation.

The other classifications listed, such as high energy, variable energy, or enhanced energy, do not accurately describe the characteristics of diagnostic X-ray radiation as understood in this context. High energy radiation would imply a different range of energies with significant biological effects, while variable or enhanced energy lacks specific definitions commonly accepted in radiation protection discourse. Therefore, low energy LET radiation effectively categorizes the type of radiation posed by diagnostic X-rays