Radiation
hideIn physics, radiation describes any process in which energy emitted by one body travels through a medium or through space, ultimately to be absorbed by another body. Non-physicists often associate the word with ionizing radiation (e.g., as occurring in nuclear weapons, nuclear reactors, and radioactive substances), but it can also refer to electromagnetic radiation (i.e., radio waves, infrared light, visible light, ultraviolet light, and X-rays) which can also be ionizing radiation, to acoustic radiation, or to other more obscure processes. What makes it radiation is that the energy radiates (i.e., it travels outward in straight lines in all directions) from the source. This geometry naturally leads to a system of measurements and physical units that are equally applicable to all types of radiation.
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News tagged with radiation
Supervolcano eruption -- in Sumatra -- deforested India 73,000 years ago
Space & Earth / Earth Sciences
Nov 23, 2009 |
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A new study provides "incontrovertible evidence" that the volcanic super-eruption of Toba on the island of Sumatra about 73,000 years ago deforested much of central India, some 3,000 miles from the epicenter, ...
New cancer target for non-Hodgkin's lymphoma
Nov 22, 2009 |
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Physician-scientists from Weill Cornell Medical College have discovered a molecular mechanism that may prove to be a powerful target for the treatment of non-Hodgkin's lymphoma, a type of cancer that affects lymphocytes, ...
Detecting the Undetectable in Prostate Cancer Testing
Nanotechnology / Bio & Medicine
Nov 18, 2009 |
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(PhysOrg.com) -- A team of Northwestern University researchers, using an extremely sensitive nanotechnology-based tool known as the biobarcode system, has detected previously undetectable levels of prostate-specific antigen ...
Scientists Reproduce a Building Block of Life in Laboratory
Nov 06, 2009 |
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(PhysOrg.com) -- NASA scientists studying the origin of life have reproduced uracil, a key component of our hereditary material, in the laboratory.
Most radiation oncologists utilize advanced medical imaging techniques, study suggests
Nov 25, 2009 |
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A recent study shows that 95 percent of radiation oncologists use advanced imaging techniques such as positron emission tomography (FDG-PET), magnetic resonance imaging (MRI), and 4-dimensional computed tomography (4DCT) ...
Stem cells alleviate tumor treatment side effects
Nov 17, 2009 |
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(PhysOrg.com) -- Human embryonic stem cells could help people with learning and memory deficits after radiation treatment for brain tumors, suggests a new UC Irvine study.
Hidden Territory on Mercury Revealed
Space & Earth / Space Exploration
Nov 04, 2009 |
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The MESSENGER spacecraft's third flyby of the planet Mercury has given scientists, for the first time, an almost complete view of the planet's surface and revealed some dramatic changes in Mercury's comet-like ...
Mysterious X-rays from a Nearby Galaxy
Nov 13, 2009 |
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(PhysOrg.com) -- The nucleus of an active galaxy, an AGN, contains a massive black hole that is vigorously accreting material. In the process it typically ejects jets of particles and radiates brightly at ...
Insomnia prevalent among cancer patients who receive chemotherapy
Nov 23, 2009 |
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Three quarters of cancer patients and survivors treated with chemotherapy suffer insomnia or sleep disorders that often become chronic conditions, hindering patients' ability to fully recover, according to scientists at the ...
Gamma-ray photon race ends in dead heat; Einstein wins this round
Oct 28, 2009 |
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Racing across the universe for the last 7.3 billion years, two gamma-ray photons arrived at NASA's orbiting Fermi Gamma-ray Space Telescope within nine-tenths of a second of one another. The dead-heat finish ...
Touchable Hologram Becomes Reality (w/ Video)
Aug 06, 2009 |
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(PhysOrg.com) -- Researchers from the University of Tokyo have developed 3D holograms that can be touched with bare hands. Generally, holograms can't be felt because they're made only of light. But the new ...
WHO study suggests link between cell phones and tumors
Oct 27, 2009 |
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(PhysOrg.com) -- Preliminary results of an International investigation by the World Health Organization (WHO) suggest there may be a "significantly increased risk" of some types of brain tumors after use of ...
Text message reminders can encourage healthy action
Nov 16, 2009 |
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People who received daily text messages reminding them to apply sunscreen were nearly twice as likely to use it as those who did not receive such messages, a new study led by a UC Davis Health System dermatologist has found. ...
Transparent aluminium is 'new state of matter'
Jul 27, 2009 |
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(PhysOrg.com) -- Oxford scientists have created a transparent form of aluminium by bombarding the metal with the world’s most powerful soft X-ray laser. 'Transparent aluminium' previously only existed in science ...
Physicists Demonstrate Quantum Memory with Matter Qubits
Jul 03, 2009 |
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(PhysOrg.com) -- For the first time, scientists have successfully operated a quantum gate between two remote particles of matter, marking an important step toward the development of a quantum computer. In ...
