ionizing radiation

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ionizing radiation

[′ī·ə‚niz·iŋ ‚rād·ē′ā·shən]
Particles or photons that have sufficient energy to produce ionization directly in their passage through a substance. Also known as ionization radiation.
Particles that are capable of nuclear interactions in which sufficient energy is released to produce ionization.

Ionizing Radiation


any radiation whose interaction with a medium ultimately leads to the ionization of atoms and molecules of the medium. Types of ionizing radiation include electromagnetic radiation, X rays, gamma radiation, and laser radiation, as well as fluxes of a-particles, electrons, positrons, protons, neutrons, and other neutral and charged particles. Charged particles ionize the atoms of the medium directly upon collision if their kinetic energy is sufficient for ionization. When neutral particles (neutrons) or photons (quanta of X rays or y-radiation) pass through the medium, ionization is brought about by the secondary charged particles that form from the interaction of the primary particles with the medium.

Ionizing radiation plays an important role in various physical and chemical processes and in biology, medicine, agriculture, and industry. Many chemical reactions take place more readily or at considerably lower temperatures and pressures under the influence of ionizing radiation. Ionizing radiation is used in sterilization, pasteurization, and preservation of foods and pharmaceuticals. It produces various mutations in microorganisms and plants.

At the same time, ionizing radiation exerts a destructive ac-tion on matter. [10–1103-2; updated]

ionizing radiation

Electromagnetic radiation that creates ions, which are atoms or molecules with fewer or greater number of electrons than they normally have. Non-ionizing radiation is radiation that does not have enough energy to alter the electron structure. See ion.
References in periodicals archive ?
The HSE also accused FedEx of not properly informing worker coming to fix the machine know about the damgers of radition exposure, noting: "You have failed to co-operate with other employers by the formal exchange of information when other employees carry out work on your premises associated with any work involving ionising radiation, in particular the maintenance of your Smiths Detection X-Ray Scanner."
"However, it is also embedded in law in the UK that exposure to ionising radiation must be kept as low as possible bearing in mind the intended use of techniques such as CT.
One is the acute exposure to ionising radiation and second is the chronic exposure arising from ingestion or inhalation of the radioactive material
We, as the custodians of the appropriate use of ionising radiation for medical imaging, must make ready for battle.
Ionising radiation has sufficient energy to remove electrons from the orbits of atoms resulting in charged particles and is evaluated for protection.
The Radiation (Emergency Preparedness and Public Information) Regulations 2001 - Statutory Instrument number 2975 - states the plan should be "designed to secure, so far as is reasonably practicable, the restriction of exposure to ionising radiation and the health and safety of persons who may be affected by.
It is difficult to identify a rationale, as this country has an academically sound, morally strong and scientifically reliable programme for the use of ionising radiation in the diagnostic process.
Quoting from reports by the US National Academy of Sciences (2005) on the risks from ionising radiation, and the seventh report on the Biological Effects of Ionizing Radiation (BEIR VII): Health Risks from Exposure to Low Levels of Ionizing Radiation:
"Radio-induced cancers can appear ten, twenty even thirty years after irradiation", but some individuals, more sensitive to the effects of X rays and other ionising radiation, are at greater risk of developing cancer, Dr Sabatier, head of the CEA's radiobiology and oncology laboratory told the press on March 25.
After having assessed the transposing measures notified by the Austrian authorities in order to comply with Directive 96/29/Euratom laying down basic safety standards for the protection of the health of workers and the general public against the dangers arising from ionising radiation, and Directive 97/43/Euratom on health protection of individuals against the dangers of ionising radiation in relation to medical exposure, the Commission considered that "the existing Austrian legislation did not ensure that these Directives would be given proper effect in practice".