At what wavelength is the break between ionizing and non-ionizing radiation?

The break between ionizing and non-ionizing radiation is commonly identified around a wavelength of approximately 400 nm. At this boundary, radiation with wavelengths shorter than 400 nm is considered to be ionizing, meaning it has enough energy to remove electrons from atoms, thus creating ions. This includes ultraviolet light, X-rays, and gamma rays, which can have significant effects on biological tissues and can potentially lead to cellular damage.

In contrast, radiation longer than 400 nm, which includes visible light and infrared radiation, is classified as non-ionizing. Non-ionizing radiation does not possess sufficient energy to break atomic bonds or ionize atoms, which means it typically does not have the same biological risks associated with it as ionizing radiation does.

Understanding the distinction at this wavelength is crucial, especially in fields related to healthcare, laser technology, and safety regulations, as it informs professionals about the potential risks and appropriate protective measures necessary when working with different types of electromagnetic radiation.