Physical characteristics of artificial light sources. 3.3.1. Physical principles. Light is electromagnetic (EM) radiation in the range from 400 to 780 nm (1 nm is 10-9 m) that is visible to the intact adult human eye (see also CEI/IEC 62471/2006). Sep 1, 2002 · Solar ultraviolet radiation. The spectrum of extraterrestrial solar radiation approximates to a blackbody of about 5800 K. The irradiance of solar radiation outside the atmosphere but at the earth's mean distance from the sun is termed the solar constant and is 1.37 kW m −2. Of this, about 9% is in the ultraviolet ( λ <400 nm). Sunburn is caused by UV radiation from the Sun but may also result from artificial sources, such as tanning lamps, welding arcs, or ultraviolet germicidal irradiation. It is the body's reaction to direct DNA damage from UVB light. This damage is mainly the formation of a thymine dimer. All occupations undertaken outdoors will result in exposure to ultraviolet radiation (UVR) from the sun. Some occupations, particularly in the manufacturing industry, will be exposed to artificial sources of UVR. Protective measures are advised for workers exposed to UVR in order to minimise potential health risks. Ultraviolet (UV) radiation is a type of energy that is released naturally by the sun and artificially from sunbeds. Too much exposure to UV radiation is the main cause of skin cancer in the UK. Almost 9 in 10 UK cases of melanoma, the most serious type of skin cancer, could be prevented by staying safe in the sun and avoiding sunbeds. Dec 8, 2023 · radiation, flow of atomic and subatomic particles and of waves, such as those that characterize heat rays, light rays, and X rays. All matter is constantly bombarded with radiation of both types from cosmic and terrestrial sources. This article delineates the properties and behaviour of radiation and the matter with which it interacts and PUd4U2.

artificial sources of uv radiation