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Hace 14 horas · The cosmic microwave background ( CMB or CMBR) is microwave radiation that fills all space in the observable universe. It is a remnant that provides an important source of data on the primordial universe. [1] With a standard optical telescope, the background space between stars and galaxies is almost completely dark.
Hace 1 día · UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs, Cherenkov radiation, and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights.
Hace 1 día · In 1974, Hawking predicted that black holes are not entirely black but emit small amounts of thermal radiation at a temperature ℏc 3 /(8πGMk B); this effect has become known as Hawking radiation. By applying quantum field theory to a static black hole background, he determined that a black hole should emit particles that display a ...
Hace 5 días · Norms increased after radiation accidents will not be considered. . All norms are based on the accumulated dose. The maximum allowable radiation dose for a person is considered to be 1000 µSv per year. However, this dose does not include the natural radiation background. Adding the average radiation background, we get 1500-2000 µSv per year.
Hace 4 días · Human populations have always been exposed to ionizing radiation, and more so in modern life due to its use in medicine, industry and the armed forces. Whilst the risks to human health from medium and high-level radiation are relatively well-understood, the risks at lower levels are less clear.
Hace 2 días · The Sun and Solar Activity. Spectral Distribution of Solar Radiation. The graph below shows the amount of radiation produced by the Sun over the wavelength range 10 Angstroms (1 Angstrom = 10 -10 metres; or 0.1 nanometres) to 50,000 Angstroms. This range spans from the extreme ultraviolet, through the ultraviolet, visible and into the infra-red.
Hace 5 días · Studying radiation from the perspective of individual microbial cells has implications not only for our ability to design microbial bioproduction systems to sustain human life in deep space, but also for our ability to interpret spaceflight radiobiology experiments using microbes as model organisms.
