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INDIRECTLY IONIZING RADIATION [5 records]

Record 1 2023-05-16

English

Subject field(s)
  • Nuclear Physics
DEF

The energy-transfer coefficient expressed in terms of length.

OBS

In the ISO-921 standard, the "energy-transfer coefficient" for a particular substance is defined as the sum of the kinetic energies of all charged particles liberated in a thin layer of the substance divided by the layer thickness and by the sum of the kinetic energies of the incident particles for a parallel beam of specified, indirectly ionizing particles incident normally on the layer. Note : The energy-transfer coefficient is a function of the energy of the radiation.

OBS

linear energy-transfer coefficient: term and definition standardized by the International Organization for Standardization (ISO).

French

Domaine(s)
  • Physique nucléaire
DEF

Coefficient de transfert d'énergie exprimé en termes de longueur.

OBS

Dans la norme ISO-921, le «coefficient de transfert d’énergie» est défini comme suit : Pour une substance donnée et un faisceau parallèle de particules indirectement ionisantes déterminées, sous incidence normale dans une couche mince de la substance, somme des énergies cinétiques de toutes les particules chargées, libérées dans cette couche de substance, divisée par l’épaisseur de la couche et par la somme des énergies cinétiques des particules incidentes. Nota : Le coefficient de transfert d’énergie est fonction de l'énergie du rayonnement.

OBS

coefficient linéaire de transfert d'énergie : terme et définition normalisés par l'Organisation internationale de normalisation (ISO).

Spanish

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Record 2 2015-04-28

English

Subject field(s)
  • Atomic Physics
  • Nuclear Physics
DEF

Radiation consisting of indirectly ionizing particles.

OBS

indirectly ionizing radiation : term standardized by ISO.

French

Domaine(s)
  • Physique atomique
  • Physique nucléaire
DEF

Rayonnement composé de particules indirectement ionisantes.

OBS

rayonnement indirectement ionisant : terme et définition normalisés par l'ISO.

Spanish

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Record 3 2014-12-30

English

Subject field(s)
  • Atomic Physics
  • Nuclear Physics
DEF

Radiation consisting of directly or indirectly ionizing particles or a mixture of both.

OBS

Examples [of ionizing radiation] are alpha particles, gamma rays, X-rays and neutrons.

OBS

ionizing radiation: term and definition standardized by ISO in 1997.

Key term(s)
  • ionising radiation

French

Domaine(s)
  • Physique atomique
  • Physique nucléaire
DEF

Rayonnement composé de particules directement ou indirectement ionisante ou d'un mélange des deux.

OBS

Les particules alpha, les rayons gamma, les rayons X et les neutrons sont des exemples de rayonnement inonisant.

OBS

rayonnement ionisant : terme et définition normalisés par l'ISO en 1997.

Spanish

Campo(s) temático(s)
  • Física atómica
  • Física nuclear
DEF

Radiación con la energía suficiente para romper enlaces químicos y desplazar los electrones de las moléculas sobre las que incide para producir una ionización.

CONT

Debido a la alta energía de los rayos X, éstos son radiación ionizante, o sea que pueden excitar electrones, formar iones, romper enlaces y formar radicales libres o sea, son capaces de dañar o matar a las células.

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Record 4 2009-10-13

English

Subject field(s)
  • Atomic Physics
CONT

indirectly ionizing radiation :radiation consisting of indirectly ionizing particles.

French

Domaine(s)
  • Physique atomique

Spanish

Save record 4

Record 5 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

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