Radiation Oncology/Physics/Photophysics

Basic photophysics in the framework of photobiology is concerned with processes that occur when sunlight, filtered through the Earth's atmosphere, interacts with matter (atoms and molecules) present on Earth The spectrum of solar radiation striking the Earth spans 100 nm to 106 nanometers (1 nm = 10-9 m) and can be divided into the ultraviolet (UV) range (100 nm to 400 nm), visible range (400 nm to 700 nm) and infrared (IR) range (700 nm to 106 nm) UV radiation has both damaging and beneficial effects on living matter UV radiation is also responsible for the photochemical reaction leading to production of the protective ozone layer in the atmosphere As the name suggests the visible part of the spectrum is the light that human eyes can detect Visible light is only one small part of the electromagnetic spectrum, which is classified by wavelength into radio wave, microwave, infrared, visible, ultraviolet, X-rays and gamma rays Physics