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INDIRECT IONIZATION [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 - external organization data 2005-07-15

English

Subject field(s)
  • Atomic Physics
  • Compartment - Canadian Nuclear Safety Commission
CONT

The gamma ray energy is transferred in large chunks and is deposited in the material by indirect (i.e., secondary) ionizations near each of the interaction sites.

French

Domaine(s)
  • Physique atomique
  • Tiroir - Commission canadienne de sûreté nucléaire
CONT

Les gammas perdent leur énergie par grandes quantités qui sont absorbées par la matière par des ionisations indirectes (secondaires), à proximité des lieux d'interaction.

Spanish

Save record 1

Record 2 2001-09-27

English

Subject field(s)
  • Atomic Physics
  • Electromagnetic Radiation
  • Soil Science
CONT

The method by which incident radiation interacts with the medium to cause ionization may be direct or indirect. Electromagnetic radiations(X rays and gamma photons) are indirectly ionizing; that is, they give up their energy in various interactions with cellular molecules, and the energy is then utilized to produce a fast-moving charged particle such as an electron. It is the electron that then secondarily may react with a target molecule. Charged particles, in contrast, strike the tissue or medium and directly react with target molecules, such as oxygen or water. These particulate radiations are directly ionizing radiations.

CONT

The third step is to fuse two tritium nuclei into one helium and two proton products. The end result of fusing four hydrogen nuclei (protons) is one helium nucleus, and two gamma ray photons, and two electron neutrinos, and kinetic heat energy.

OBS

Gamma rays: A very penetrating electromagnetic radiation emitted from a nucleus of an atom during radioactive decay. Radiation: An emission of energy in the form of photons (gamma, x-rays) or particles (alpha, beta, positron, neutron radiation). Photon: A type of radiation in the form of an electromagnetic wave, having zero mass and zero charge.

Key term(s)
  • gamma photon

French

Domaine(s)
  • Physique atomique
  • Rayonnements électromagnétiques
  • Science du sol
CONT

Les photons gamma très pénétrants permettent de réaliser de véritables radiographies des matériaux les plus denses. Cette technique [gammamétrie] est appliquée depuis quelques années à la détermination de la densité et de l'humidité des sols.

Spanish

Save record 2

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