News tagged with ionizing radiation

Related topics: radiation , radiation exposure , ct scan , radiation dose

Detecting blood clots with portable device

Blockages in lung arteries could be diagnosed safely in real-time helping as many as 20,000 respiratory patients in Australia each year with emerging technology being developed by electrical engineering researchers at the ...

Jun 10, 2015
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A new cellular response to radiation exposure

Almost the entire human genome is transcribed into RNA, but only a fraction of this is actually used to produce protein. The function of the majority of the RNA, the so-called "non-coding transcriptome" remains an enigma. ...

Apr 30, 2015
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Observation in the ER can reduce CT scans in kids

The longer a child with minor blunt head trauma is observed in the emergency department, the less likely the child is to require computed tomography (CT) scan, according to the results of a study published online Friday in ...

Aug 06, 2013
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SPECT/MR molecular imaging system makes its debut

The Society of Nuclear Medicine and Molecular Imaging's 2013 Annual Meetingmarks the unveiling of the successful application of a new preclinical hybrid molecular imaging system—single photon emission tomography and magnetic ...

Jun 11, 2013
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Ionizing radiation

Ionizing radiation consists of subatomic particles or electromagnetic waves that are energetic enough to detach electrons from atoms or molecules, ionizing them. The occurrence of ionization depends on the energy of the impinging individual particles or waves, and not on their number. An intense flood of particles or waves will not cause ionization if these particles or waves do not carry enough energy to be ionizing. Roughly speaking, particles or photons with energies above a few electron volts (eV) are ionizing.

Examples of ionizing particles are energetic alpha particles, beta particles, and neutrons. The ability of electromagnetic waves (photons) to ionize an atom or molecule depends on their wavelength. Radiation on the short wavelength end of the electromagnetic spectrum - ultraviolet, x-rays, and gamma rays - is ionizing.

Ionizing radiation comes from radioactive materials, x-ray tubes, particle accelerators, and is present in the environment. It is invisible and undetectable by human senses, so instruments such as geiger counters are required to detect its presence. It has many practical uses in medicine, research, construction, and other areas, but presents a health hazard if used improperly. Exposure to radiation causes microscopic damage to living tissue, resulting in skin burns, radiation sickness and death at high doses and cancer, tumors and genetic damage at low doses.

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