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
Tumor-attacking virus strikes with 'one-two punch'
Dec 01, 2009 |
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Ohio State University cancer researchers have developed a tumor-attacking virus that both kills brain-tumor cells and blocks the growth of new tumor blood vessels.
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, ...
Lightning-produced radiation a potential health concern for air travelers
Space & Earth / Earth Sciences
5 hours ago |
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New information about lightning-emitted X-rays, gamma rays and high-energy electrons during thunderstorms is prompting scientists to raise concerns about the potential for airline passengers and crews to be ...
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 ...
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.
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 ...
Understanding DNA Repair and Cancer
Dec 03, 2009 |
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(PhysOrg.com) -- A protein that plays a key role in copying DNA also plays a vital role in repairing breaks in it, UC Davis scientists have found. The work is helping researchers understand how cancer cells can resist radiation ...
Strong regional climatic fluctuations in the tropics
Space & Earth / Earth Sciences
Dec 02, 2009 |
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Climatic fluctuations close to the equator show a different pattern to climate change in the Arctic and Antarctic. In the tropics distinct 11500 year fluctuations between wet and dry periods can be clearly identified which ...
Scientists identify possible therapy target for aggressive cancer
Dec 01, 2009 |
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UT Southwestern Medical Center researchers have found that a naturally occurring protein -- transforming growth factor beta1 (TGF-ß1) -- which normally suppresses the growth of cancer cells, causes a rebound effect after ...
Women researchers less likely to receive major career funding grants, study shows
Nov 30, 2009 |
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Women were less likely than men to receive major funding for scientific research, according to a study from the University of Michigan Health System. The study also found that only a quarter of all researchers, ...
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. ...
Stem cells restore cognitive abilities impaired by brain tumor treatment, study finds
Nov 09, 2009 |
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Human embryonic stem cells could help people with learning and memory deficits after radiation treatment for brain tumors, suggests a new UC Irvine study.
NRL's MISSE7 launched aboard STS-129
Space & Earth / Space Exploration
7 hours ago |
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The Materials on the International Space Station Experiment (MISSE) 7, designed and built by the Naval Research Laboratory (NRL), launched aboard STS-129 on November, 16, for transport to the International ...
PSA value at 2 years post-treatment can predict long-term survival in prostate cancer patients
Dec 02, 2009 |
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Prostate cancer patients who have a prostate-specific antigen (PSA) value of less than or equal to 1.5 at two years after external beam radiation therapy (EBRT) are less likely to have a cancer recurrence and cancer-related ...
