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
Lightning-produced radiation a potential health concern for air travelers
Space & Earth / Earth Sciences
Dec 07, 2009 |
3.8 / 5 (9) |
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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 ...
Turning metal black more than just a novelty
Dec 08, 2009 |
4.6 / 5 (18) |
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(PhysOrg.com) -- University of Rochester optics professor Chunlei Guo made headlines in the past couple of years when he changed the color of everyday metals by scouring their surfaces with precise, high-intensity laser bursts.
Children who survive cancer more likely to suffer from heart disease
Dec 09, 2009 |
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Children and adolescents who survive cancer have a significantly higher risk of developing heart disease as young adults, according to the largest study on this issue published on bmj.com today.
Better-than-new LIDAR provides 24/7 atmospheric aerosol data
Space & Earth / Earth Sciences
Dec 08, 2009 |
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(PhysOrg.com) -- A team of researchers from eight institutions led by Pacific Northwest National Laboratory has solved a software and hardware problem that had perplexed scientists studying atmospheric aerosols ...
NRL's MISSE7 launched aboard STS-129
Space & Earth / Space Exploration
Dec 07, 2009 |
4 / 5 (1) |
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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 ...
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 ...
