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.
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.
Only the highest-energy x-rays can get through, and that's the invisible radiation that allows researchers observe the black holes indirectly.
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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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.
These produce radiation at about the level of one dental X-ray in the immediate vicinity and quickly dissipate.
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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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.
When the procedure is being performed, the patient is being x-rayed, and the surgeon is exposed to the radiation as well.
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.
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.
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.
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.
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.
X-rays and gamma rays that Eros gives off in response to bombardment by solar and cosmic radiation.
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