As matter gets compressed by the black hole, X-ray radiation is emitted.
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.
It had a radiation detector, an X-ray crystallographer, and a complete weather station.
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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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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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.
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.
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.
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.
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.
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