As matter gets compressed by the black hole, X-ray radiation is emitted.
It had a radiation detector, an X-ray crystallographer, and a complete weather station.
You get an x-ray and you are exposed to the radiation for very brief instant, maybe a couple of seconds, after that the radiation goes to zero.
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The radiation dose from an individual dental X-ray, Dr Claus points out, has gone down by about half over the past 30 years or so.
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Kaltbaum is also buying Varian Medical Systems (nyse: VAR - news - people ), a company that makes X-ray tubes and systems for treating cancer with radiation.
When the procedure is being performed, the patient is being x-rayed, and the surgeon is exposed to the radiation as well.
These produce radiation at about the level of one dental X-ray in the immediate vicinity and quickly dissipate.
Some revolutionaries were slighted by the scientific establishments of their time--like Rosalind Franklin's exclusion from sharing in the Nobel Prize for the discovery of the structure of DNA. Described by her peers as a "genius, " she exposed herself to massive amounts of radiation to try to get the best possible X-ray photograph of a strand of DNA, dying of cancer at 37.
External beam radiation involves zapping a patient with high-dose X rays generated by a machine called a linear accelerator.
Only the highest-energy x-rays can get through, and that's the invisible radiation that allows researchers observe the black holes indirectly.
Certain elements on the surface emitted X-rays when the sun zapped Eros with an intense burst of radiation for 30 minutes on May 4.
Radiation from the flare was so intense it saturated the X-ray detectors on two spacecraft used by the U.S. government to determine the strength of the solar blasts.
He found x-ray machines that were obsolete and likely to be delivering much higher doses of radiation to patients.
Most diffuse X-ray sources in the Universe have a characteristic temperature because they represent the residual radiation from an event, such as a supernova.
In fact, while the low-risk patients might not receive any benefit from the test, there is at least some risk from radiation--which is higher for a CT angiogram than a traditional X-ray.
X-rays and gamma rays that Eros gives off in response to bombardment by solar and cosmic radiation.
Separately to the privacy concerns, some health officials feared the Rapiscan 1000SP scanner, which uses low-level X-rays to generate the image viewed by screeners, might expose passengers to unsafe levels of radiation.
Even subsistence fishermen, who eat far more fish than the typical American, would receive a dose of radiation from the cesium isotopes released in the meltdown equivalent to a single dental X-ray, Fisher and his colleagues reported.
Founded in 1954 by the son of a traveling X-ray machine installer, the Glenwood, Ill. company makes tools called dosimeters, which measure and monitor radiation exposure.
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