Radiation can refer to one of the following: Specific types in physics: Alpha radiation, composed of the nuclei of helium-4 atoms. Beta radiation, consisting of energetic electrons or positrons. Gamma radiation, which are high-energy electromagnetic waves such as X rays. Delta radiation Epsilon radiation Cherenkov radiation, radiation by a particle moving through an insulating medium faster than the speed of light in that medium. Electromagnetic radiation, a str ...

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Definition and meaning of radiation:

radiation - energy that comes from a source and travels through some material or through space. Light, heat and sound are types of radiation

(Source: US National Oceanic and Atmospheric Administration (NOAA) )

Also see these pages: Oceanography, Oceanography Sitemap, Coral Reef, Environment, Sustainability, Climate Change,

radiation

Power existing in various wave rates and lengths. Believed to be the carrier of spirit communication with sensitives. This force is immune to material insulation and passes through solid substances. It is not explained by physical laws and is generally accepted as being of the supernormal

(See also: Radiation, Body Mind and Soul)

Mars has no global geomagnetic field comparable to Earth's. Combined with a thin atmosphere, this increases the amount of ionizing radiation that reaches the Martian surface. The Mars Odyssey spacecraft carried an instrument, the Mars Radiation Environment Experiment (MARIE), to measure the dangers to humans. MARIE found that radiation levels in orbit above Mars are 2.5 times higher than at the International Space Station. Average doses were about 22 millirads per day (220 micrograys per day or 0.8 gray per year). A three year exposure to su ...

See also:

Colonization of Mars, Colonization of Mars - Similarity to Earth, Colonization of Mars - Differences, Colonization of Mars - Habitability, Colonization of Mars - Radiation, Colonization of Mars - Communication, Colonization of Mars - Possible locations for colonies, Colonization of Mars - Polar regions, Colonization of Mars - Midlands, Colonization of Mars - Valles Marineris, Colonization of Mars - Concerns

Read more here: » Colonization of Mars: Encyclopedia II - Colonization of Mars - Radiation

Cyclotron radiation is a type of bremsstrahlung (braking) radiation. It is electromagnetic radiation emitted by moving charged particles trapped in a magnetic field. The Lorentz force on the particles acts perpendicular to both the magnetic field lines and the particle's motion through them, creating an acceleration of charged particles that causes them to emit radiation (and to spiral around the magnetic field lines). The name of this radiation derives from the cyclotron, a type of particle accelerator used since the 1930s to ...

Read more here: » Cyclotron radiation: Encyclopedia - Cyclotron radiation

Background radiation is the ionizing radiation from several natural radiation sources: sources in the Earth and from those sources that are incorporated in our food and water, which are incorporated in our body, and in building materials and other products that incorporate those radioactive sources; radiation sources from space (in the form of cosmic rays); and sources in the atmosphere which primarily come from both the radon gas that is released from the earth's surface and subsequently decays to radioactive atoms that become attach ...

Including:

• Background radiation - Natural background radiation
• Background radiation - Cosmic radiation
• Background radiation - Terrestrial sources
• Background radiation - Radon
• Background radiation - Man-made background radiation
• Background radiation - Man-made radiation sources
• Background radiation - Other usage

Read more here: » Background radiation: Encyclopedia - Background radiation

Adaptive radiation describes the rapid speciation of a single or a few species to fill many ecological niches. This is an evolutionary process driven by mutation and natural selection. Adaptive radiation often occurs when a species is introduced to a new ecosystem, or when a species can survive in an environment that was unreachable before. For example, Darwin's finches on the Galapagos islands developed from a single species of finches that reached the islands. Other examples include the introduction of predatory mammals to Au ...

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Cherenkov radiation (also spelled Cerenkov or sometimes Čerenkov) is electromagnetic radiation emitted when a charged particle passes through an insulator at a speed greater than that of light in the medium. The characteristic "blue glow" of nuclear reactors is due to Cherenkov radiation. It is named after Pavel Alekseyevich Cherenkov, the 1958 Nobel Prize winner who was the first to rigorously characterize it. Cherenkov radiation - Physical origin. While relativity holds that the speed of li ...

Including:

• Cherenkov radiation - Physical origin
• Cherenkov radiation - Characteristics
• Cherenkov radiation - Uses
• Cherenkov radiation - Notes

Read more here: » Cherenkov radiation: Encyclopedia - Cherenkov radiation

Electromagnetic radiation is a propagating wave in space with electric and magnetic components. These components oscillate at right angles to each other and to the direction of propagation. The term electromagnetic radiation is also used as a synonym for electromagnetic waves in general, even if they are not radiating or travelling in free space. This sense includes, for example, light travelling through an optica ...

Including:

• Electromagnetic radiation - Physics
• Electromagnetic radiation - Theory
• Electromagnetic radiation - Properties
• Electromagnetic radiation - Wave model
• Electromagnetic radiation - Particle model
• Electromagnetic radiation - Speed of propagation
• Electromagnetic radiation - Electromagnetic spectrum
• Electromagnetic radiation - Light
• Electromagnetic radiation - Radio waves
• Electromagnetic radiation - Derivation

Read more here: » Electromagnetic radiation: Encyclopedia - Electromagnetic radiation

An anti-radiation missile is a missile which is designed to detect and home in on the emissions of an enemy radar installation. Commonly carried by specialist aircraft in the SEAD role (known to the USAF as "Wild Weasels"), the primary purpose of this type of missile is to degrade enemy air defences in the first period of a conflict in order to increase the chances of survival for the following waves of strike aircraft. They can also be used to quickly shut down unexpected SAM sites during a raid. Aircraft which fly with strike aircra ...

Read more here: » Anti-radiation missile: Encyclopedia - Anti-radiation missile

edit In cosmology, the cosmic microwave background radiation (most often abbreviated CMB but occasionally CMBR, CBR or MBR) is a form of electromagnetic radiation discovered in 1965. It has a thermal black-body spectrum which peaks in the microwave range. Most cosmologists consider the cosmic microwave background radiation to be the best evidence for the hot big bang model of the universe. Cosmic microwave background radiation - Features. The cosmic microwav ...

Including:

• Cosmic microwave background radiation - Features
• Cosmic microwave background radiation - History
• Cosmic microwave background radiation - Relationship to the Big Bang
• Cosmic microwave background radiation - Temperature
• Cosmic microwave background radiation - Primary anisotropy
• Cosmic microwave background radiation - Polarization
• Cosmic microwave background radiation - Secondary anisotropy
• Cosmic microwave background radiation - Microwave background observations
• Cosmic microwave background radiation - Analyses
• Cosmic microwave background radiation - Low multipoles

Read more here: » Cosmic microwave background radiation: Encyclopedia - Cosmic microwave background radiation

The Van Allen radiation belt is a torus of energetic charged particles (ie. a plasma) around Earth, trapped by Earth's magnetic field. When the belts "overload", particles strike the upper atmosphere and fluoresce, causing the polar aurora. The presence of a radiation belt had been theorized prior to the Space Age and the belt's presence was confirmed by the Explorer I on January 31, 1958 and Explorer III missions, under Doctor James Van Allen. The trapped ...

Including:

• Van Allen radiation belt - The Outer Van Allen Belt
• Van Allen radiation belt - The Van Allen Belt's impact on space travel
• Van Allen radiation belt - The Van Allen Belts and why they exist
• Van Allen radiation belt - Removing the belts
• Van Allen radiation belt - Trivia

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Radiation Generally, the emission of life energies, or various kinds of energic outflowings or productions radially outward from a center. Thus it is a name for the entire cosmic process of formation of worlds; the production of many out of one, the passing from unity to measureless diversity and multiplicity.

The radiations of the ten or twelve solar logoi from the heart of the solar chain, streaming through and permeating the entire extent of the sun's kingdom and becoming focalized in the different planetary bodies, illustrate the modus of the general principle of radiation.

According to theosophic teachings physical matter is a condensation of light, as is being experimentally verified. It is evident that the subject of the emanation of innumerable forms of life energy on all the planes of the cosmos is a very wide one, and the words fohat, light, life, electricity, etc., are used in this connection. These radiations may be classified on a septenary, denary, or duodenary system, as when we speak of the seven, ten, or twelve rays of the solar logos.

See also RAY

(See also: Radiation, Mysticism, Mysticism Dictionary)

Ionizing radiation is produced by radioactive decay, nuclear fission and nuclear fusion, extremely hot objects (thermal or blackbody radiation), and accelerated charges (bremsstrahlung or synchrotron radiation). In order for radiation to be ionizing, the particles must both have a high enough energy and interact with electrons. Photons interact strongly with charged particles, so photons of sufficiently high energy are ionizing (the energy at which this begins to happen is in the ultraviolet region; sunburn is one of the effects of th ...

See also:

Ionizing radiation, Ionizing radiation - Types of radiation, Ionizing radiation - Example: Electromagnetic radiation, Ionizing radiation - Sources of ionizing radiation, Ionizing radiation - Natural background radiation, Ionizing radiation - Man-made radiation sources, Ionizing radiation - The effects of ionizing radiation on animals, Ionizing radiation - Chronic radiation exposure, Ionizing radiation - Acute radiation exposure, Ionizing radiation - Radiation levels, Ionizing radiation - Minimizing health effects of ionizing radiation

Read more here: » Ionizing radiation: Encyclopedia II - Ionizing radiation - Types of radiation

The energy of a photon (i.e., a quantum of electromagnetic radiation) is given by the Planck equation: E = hν where E is the energy of the photon h is Planck's constant ν is the frequency of the photon The wavelength of a photon is related to its frequency by the equation of a wave's v ...

See also:

Ionizing radiation, Ionizing radiation - Types of radiation, Ionizing radiation - Example: Electromagnetic radiation, Ionizing radiation - Sources of ionizing radiation, Ionizing radiation - Natural background radiation, Ionizing radiation - Man-made radiation sources, Ionizing radiation - The effects of ionizing radiation on animals, Ionizing radiation - Chronic radiation exposure, Ionizing radiation - Acute radiation exposure, Ionizing radiation - Radiation levels, Ionizing radiation - Minimizing health effects of ionizing radiation

Read more here: » Ionizing radiation: Encyclopedia II - Ionizing radiation - Example: Electromagnetic radiation

The rad is a unit of absorbed radiation dose defined in terms of the energy actually deposited in the tissue. One rad is an absorbed dose of 0.01 joules of energy per kilogram of tissue. The more recent SI unit is the gray, which is defined as 1 joule of deposited energy per kilogram of tissue. Thus one gray is equal to 100 rad. To accurately assess the risk of radiation, the absorbed dose energy in rad is multiplied by the relative biological effectiveness (RBE) of the radiation to get the biological dose equivalent in rems. Rem stan ...

See also:

Radiation poisoning, Radiation poisoning - Measuring radiation dosage, Radiation poisoning - Symptoms and effects, Radiation poisoning - Prevention and treatment, Radiation poisoning - Table of exposure levels and symptoms, Radiation poisoning - 0.05–0.2 Sv 5–20 REM, Radiation poisoning - 0.2–0.5 Sv 20–50 REM, Radiation poisoning - 0.5–1 Sv 50–100 REM, Radiation poisoning - 1–2 Sv 100–200 REM, Radiation poisoning - 2–3 Sv 200–300 REM, Radiation poisoning - 3–4 Sv 300–400 REM, Radiation poisoning - 4–6 Sv 400–600 REM, Radiation poisoning - 6–10 Sv 600–1000 REM, Radiation poisoning - 10–50 Sv 1000–5000 REM, Radiation poisoning - 50–80 Sv 5000–8000 REM, Radiation poisoning - More than 80 Sv >8000 REM, Radiation poisoning - Radiation poisoning in fiction

Read more here: » Radiation poisoning: Encyclopedia II - Radiation poisoning - Measuring radiation dosage

Ionizing radiation - Natural background radiation. Natural background radiation comes from four primary sources: cosmic radiation, solar radiation, external terrestrial sources, and radon. The earth, and all living things on it, are constantly bombarded by radiation from outside our solar system of positively charged ions from protons to iron nuclei. This radiation interacts in the atmosphere to create secondary radiation that rains down, including x-rays, muons, protons, alpha particles, pions, electrons, and neutrons. The dose f ...

See also:

Ionizing radiation, Ionizing radiation - Types of radiation, Ionizing radiation - Example: Electromagnetic radiation, Ionizing radiation - Sources of ionizing radiation, Ionizing radiation - Natural background radiation, Ionizing radiation - Man-made radiation sources, Ionizing radiation - The effects of ionizing radiation on animals, Ionizing radiation - Chronic radiation exposure, Ionizing radiation - Acute radiation exposure, Ionizing radiation - Radiation levels, Ionizing radiation - Minimizing health effects of ionizing radiation

Read more here: » Ionizing radiation: Encyclopedia II - Ionizing radiation - Sources of ionizing radiation

Natural background radiation comes from three primary sources: cosmic radiation, terrestrial sources, and radon. The worldwide average background dose for a human being is about 2.4 mSv per year [1] (pdf). This exposure is mostly from cosmic radiation and natural isotopes in the Earth. Background radiation - Cosmic radiation. The Earth, and all living things on it, are constantly bombarded by radiation from outside our solar system of positively charged ions from protons to iron nuclei. This radiation inte ...

See also:

Background radiation, Background radiation - Natural background radiation, Background radiation - Cosmic radiation, Background radiation - Terrestrial sources, Background radiation - Radon, Background radiation - Man-made background radiation, Background radiation - Man-made radiation sources, Background radiation - Other usage

Read more here: » Background radiation: Encyclopedia II - Background radiation - Natural background radiation

A point radiation or sound source. At a distance, the sun is an isotropic radiator of electromagnetic radiation. The Big Bang is another example of an isotropic radiator - the Cosmic Microwave Background [1] Isotropic radiator - Antenna Theory. In antenna theory, the isotropic radiator is a theoretical ideal - a perfect omni-directional antenna displaying isotropy. ...

See also:

Isotropic radiator, Isotropic radiator - Physics, Isotropic radiator - Antenna Theory, Isotropic radiator - Optics, Isotropic radiator - Sound

Read more here: » Isotropic radiator: Encyclopedia II - Isotropic radiator - Physics

We tend to think of biological effects of radiation in terms of their effect on living cells. For low levels of radiation exposure, the biological effects are so small they may not be detected. The body repairs many types of radiation and chemical damage. Biological effects of radiation on living cells may result in four outcomes: Injured or damaged cells repair themselves, resulting in no residual damage. Cells die, much like millions of body cells do every day, being replaced through normal biological processes. ...

See also:

Ionizing radiation, Ionizing radiation - Types of radiation, Ionizing radiation - Example: Electromagnetic radiation, Ionizing radiation - Sources of ionizing radiation, Ionizing radiation - Natural background radiation, Ionizing radiation - Man-made radiation sources, Ionizing radiation - The effects of ionizing radiation on animals, Ionizing radiation - Chronic radiation exposure, Ionizing radiation - Acute radiation exposure, Ionizing radiation - Radiation levels, Ionizing radiation - Minimizing health effects of ionizing radiation

Read more here: » Ionizing radiation: Encyclopedia II - Ionizing radiation - The effects of ionizing radiation on animals