Ionizing Radiation


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ionizing radiation

[′ī·ə‚niz·iŋ ‚rād·ē′ā·shən]
(nucleonics)
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]

References in periodicals archive ?
There are lots of defense applications both in peacetime and wartime that require computers that can operate in the presence of ionizing radiation.
This report addresses systems using ionizing radiation, but also describes briefly some systems under consideration that utilize nonionizing radiation sources.
Putting everything in perspective, keep in mind that there is no escape from ionizing radiation.
The annual limit on public exposure from a single source of ionizing radiation is 100 mrem (1 mSv), both in the United States and internationally.
The consequences they envisioned seemed horrifying in terms of what scientists know about the effects of ionizing radiation on living organisms.
Ionizing radiation is a part of the spectrum of electromagnetic energy that includes a type of energy similar to radio and television waves, microwaves and infrared radiation.
ATLANTA -- A model policy intended to minimize the likelihood that pregnant women will be exposed to dangerous levels of ionizing radiation during emergency imaging studies has been developed by the radiology department of the University of Iowa Hospitals and Clinics, Iowa City.
The final standards incorporate many of the comments and prohibit the use of genetic engineering, ionizing radiation, and sewage sludge in organic production.
In July, the Food and Drug Administration (FDA) approved the use of ionizing radiation on eggs in the shell to reduce Salmonella levels.
FDA found "there is little change in the levels of individual fatty acids, or in the structure, digestibility, or biological value of protein, when shell eggs are treated with ionizing radiation up to 3 kiloGray (kGy).
government regulations permitting the use of ionizing radiation for treating refrigerated or frozen uncooked red meat and poultry have heightened interest in the irradiation process and the effects of the process on foods and polymeric packaging materials.
The light weight portable monitor gives an immediate indication of exposure to ionizing radiation without waiting for film badges to be developed.