Category: P

An electron that is ejected from its orbit around the nucleus of an atom by interaction with a photon of energy (light, x-radiation, and so on). The ultimate outcome occurs when a photon, having traversed a body of irradiated matter, comes across a tightly bound electron, specifically the electron residing in closest proximity to the…

Electricity formed by the action of light.  

An interaction between x-rays and matter in which the x-ray photon ejects an inner-shell electron, causing a cascade of outer-shell electrons to fill the hole. The changing of energy shells releases secondary radiation equal to the difference in the binding energies. This absorption reaction increases the patient dose and creates contrast on the radiographic film.…

To the effects of light on biological, chemical, or physical systems.  

The use of high-intensity light or laser to create hundreds of tiny retinal burns outside of the vascular arcades. This treatment has been shown to produce regression of abnormal blood vessels in patients with proliferative retinopathy from diabetes or retinal vein occlusion,  

The exposure of blood that is temporarily removed from the body to ultraviolet A radiation. This is used to treat several diseases, including pemphigus vulgaris and cutaneous T cell lymphoma.  

The branch of chemistry concerned with the effects of light rays.  

Capable of living only in the light.  

The use of low-intensity light, typically in the near-infrared region of the electromagnetic spectrum, to stimulate body tissues, relieve inflammation and pain, improve wound healing, or regenerate damaged cells. It is also known as low level laser therapy, or cold laser therapy.  

The study of the effect of light on living things.