News tagged with radiation dose
Fukushima radiation mostly within accepted levels: WHO
Radiation affecting residents in Japan's Fukushima prefecture since the nuclear plant disaster is below the reference level for public exposure in all but two areas, the World Health Organization said Wednesday.
May 23, 2012 |
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To peer inside a living cell
(PhysOrg.com) -- Quantum mechanics could help build ultra-high-resolution electron microscopes that won't destroy living cells, according to MIT electrical engineers.
Oct 06, 2009 |
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New detector design improves gamma-ray measurements
(Phys.org) -- In the pursuit of precision measurements, nothing is simple, even when the apparatus employed appears to be utterly uncomplicated. An instructive case in point is the new ionization chamber used ...
Apr 06, 2012 |
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Experts: Store blood cells from Japan nuke workers
Workers at Japan's troubled nuclear plant should store blood cells now in case they need them later as treatment for radiation overdose, some Japanese experts suggest.
Apr 15, 2011 |
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Research on US nuclear levels after Fukushima could aid in future nuclear detection
The amount of radiation released during the Fukushima nuclear disaster was so great that the level of atmospheric radioactive aerosols in Washington state was 10,000 to 100,000 times greater than normal levels in the week ...
Sep 09, 2011 |
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Bird populations near Fukushima are more diminished than expected
(PhysOrg.com) -- Low-level radiation in Fukushima Prefecture appears to have had immediate effects on bird populations, and to a greater degree than was expected from a related analysis of Chernobyl, an international ...
Feb 09, 2012 |
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Proteomics identifies targets of ionizing radiation in a human skin model
(Phys.org) -- How better to find out what effect ionizing radiation has on human skin than by using the real thing? Researchers at Pacific Northwest National Laboratory did that by performing a quantitative ...
Apr 24, 2012 |
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Lightning-produced radiation a potential health concern for air travelers
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 ...
Space & Earth / Earth Sciences
Dec 07, 2009 |
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The Phantom Torso Returns
The Phantom Torso is back, and he has quite a story to tell. He's an armless, legless, human-shaped torso, a mannequin that looks like he's wrapped in a mummy's bandages. Scientists at the European Space Agency ...
Space & Earth / Space Exploration
May 28, 2009 |
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CT scans: Too much of a good thing can be risky
Patients who undergo numerous CT scans over their lifetime may be at increased risk for cancer, according to a study published in the April issue of Radiology.
Mar 31, 2009 |
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Lung cancer scans: False alarms amid lives saved
(AP) -- Full results of a big study that showed some smokers' lives could be saved by screening with lung scans now reveal more clearly what the risks are: There's a good chance of a false alarm.
Jun 29, 2011 |
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Amid Japan crisis, hunt for better radiation care
(AP) -- Japan's nuclear emergency highlights a big medical gap: Few treatments exist to help people exposed to large amounts of radiation.
Mar 28, 2011 |
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Post-surgery radiation improves breast cancer survival
Radiation therapy following surgery for a rare type of breast cancer improves patient survival, according to a study by a team of surgical oncologists at UC Davis Cancer Center.
Aug 31, 2010 |
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Medical Physicists: CT Scans Safe
Mayo Clinic professor of radiological physics Cynthia McCollough calls last fall's news from Cedars-Sinai Medical Center the straw that broke the camel's back for the CT scan community, at least when it comes ...
May 04, 2010 |
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New model may simplify high-dose radiosurgery planning
There is yet no straightforward way to determine the optimal dose level and treatment schedules for high-dose radiation therapies such as stereotactic radiation therapy, used to treat brain and lung cancer, or for high-dose ...
Sep 02, 2010 |
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Absorbed dose
Absorbed dose (also known as total ionizing dose, TID) is a measure of the energy deposited in a medium by ionizing radiation. It is equal to the energy deposited per unit mass of medium, and so has the unit J/kg, which is given the special name Gray (Gy).
Note that the absorbed dose is not a good indicator of the likely biological effect. 1 Gy of alpha radiation would be much more biologically damaging than 1 Gy of photon radiation for example. Appropriate weighting factors can be applied reflecting the different relative biological effects to find the equivalent dose.
The risk of stochastic effects due to radiation exposure can be quantified using the effective dose, which is a weighted average of the equivalent dose to each organ depending upon its radiosensitivity.
When ionising radiation is used to treat cancer, the doctor will usually prescribe the radiotherapy treatment in Gy. When risk from ionising radiation is being discussed, a related unit, the sievert is used.
For more information about Absorbed dose, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
