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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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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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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Health uncertainties torment Japanese in nuke zone
(AP) -- Yoshiko Ota keeps her windows shut. She never hangs her laundry outdoors. Fearful of birth defects, she warns her daughters: Never have children.
Mar 07, 2012 |
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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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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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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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Greenpeace warns of radioactive sea life off Japan
Environmental group Greenpeace warned Thursday that marine life it tested more than 20 kilometres (12 miles) off Japan's stricken Fukushima nuclear plant showed radiation far above legal limits.
May 26, 2011 |
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Primordial fear: why radiation is so scary
Nuclear radiation is frightening stuff. A quarter century after Chernobyl, and more than 65 years after atomic bombs laid waste to Hiroshima and Nagasaki, fatally sickening thousands not killed outright, even ...
Apr 24, 2011 |
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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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Emergency department CT exams of children have increased substantially
Computed tomography examinations of children in hospital emergency departments increased substantially from 1995 to 2008, according to a new study published online and in the June print edition of Radiology. Researchers said t ...
Apr 05, 2011 |
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Safer CT scanning for children developed
A research team at the Queen Silvia Children's Hospital has developed a method that allows the lowest possible dose of radiation for children having a CT scan while still obtaining good image quality, reveals a thesis from ...
Apr 04, 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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Tests on century-old equipment show how far X-rays have come
Researchers recently tested first-generation x-ray equipment from 1896 and found that it produced radiation doses and exposure times that were vastly higher than those of today's systems, according a study published online ...
Mar 16, 2011 |
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Study shows chemoradiotherapy prior to surgery improves survival
Researchers from Boston University School of Medicine (BUSM) have found that patients with node negative T3 and T4 non-small lung cancer who underwent chemotherapy before surgery had more than three times the survival rate ...
Feb 28, 2011 |
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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.
