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Definition of «radioactivity»

Radioactivity refers to the emission of particles or energy from unstable atomic nuclei. This process is called radioactive decay, and it occurs when an atom's nucleus emits radiation in order to achieve a more stable configuration. Radioactivity can be classified into three types: alpha (α), beta (β) and gamma (γ). Alpha particles are helium-4 nuclei, while beta particles are high-energy electrons or positrons. Gamma rays are electromagnetic radiation with very high energy. The term "radioactive" is often associated with negative connotations due to the potential dangers of exposure to ionizing radiation emitted by radioactive materials. However, radioactivity also has many practical applications in fields such as medicine and industry.

Usage examples

  1. The researchers measured the radioactivity levels in the nuclear power plant to ensure the safety of the workers.
  2. The radioactive decay of uranium-238 produces various isotopes, demonstrating the inherent radioactivity of the substance.
  3. After the accident at the nuclear reactor, authorities immediately conducted tests to assess the spread of radioactivity in the surrounding environment.
  4. Scientists use Geiger-Muller counters to detect and measure the intensity of radioactivity in specific materials.
  5. Radioactive materials like radium and plutonium emit dangerous levels of radioactivity, posing serious health risks to humans if not handled properly.
  6. It is crucial to dispose of nuclear waste properly to prevent the release of radioactivity into the ecosystem.
  7. The half-life of a radioactive element determines the rate at which its radioactivity diminishes over time.
  8. Radiotherapy is a medical treatment that uses high-energy radiation to target and destroy cancer cells by harnessing their inherent radioactivity.

Phrases with «radioactivity»

Sentences with «radioactivity»

  • For the purpose of this Exclusion; i) Utilization of Nuclear weapons of mass destruction means the use of any explosive nuclear weapon or device or the emission, discharge, dispersal, release or escape of fissile material emitting a level of radioactivity capable of causing incapacitating disablement or death amongst people or animals (including in connection with Terrorist Activity). (sevencorners.com)
  • On 1 April, TEPCO admitted that levels of radioactivity in groundwater underneath the facility were 10,000 times the legal limit, mainly as a result of contamination with iodine - 131. (newscientist.com)
  • Very high levels of radioactivity from radon gas have been found in abandoned mines used by prospectors in Southwest England. (newscientist.com)
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See also

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