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NEUTRON SHIELD [5 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2015-04-29

English

Subject field(s)
  • Nuclear Physics
DEF

A theory for the calculation of neutron attenuation in certain radiation shield materials treating the attenuation process in two steps : initially, a source of first-collision neutrons is determined by means of removal cross-sections; then, the resulting neutron flux density is calculated by diffusion theory.

OBS

removal-diffusion theory: term and definition standardized by ISO.

French

Domaine(s)
  • Physique nucléaire
DEF

Théorie pour le calcul de l'atténuation neutronique dans certains matériaux écrans traitant le processus d'atténuation en deux étapes : d'abord une source de neutrons de première collision est déterminée au moyen des sections efficaces de déplacement, ensuite le débit de fluence neutronique résultant est calculé par la théorie de la diffusion.

OBS

théorie de déplacement-diffusion : terme et définition normalisés par l'ISO.

Spanish

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Record 2 2014-12-10

English

Subject field(s)
  • Atomic Physics
CONT

After the depleted fuel assemblies are removed from the reactor, they are placed in a canister … The canister alone, however, is not sufficient to provide adequate gamma or neutron radiation shielding. Therefore, apparatus that provide additional radiation shielding are required during transport, preparation and subsequent dry storage … The additional shielding is achieved by placing the canisters within large cylindrical containers called casks. Casks are typically designed to shield the environment from the dangerous radiation in two ways. First, shielding of gamma radiation requires large amounts of mass. Gamma rays are best absorbed by materials with a high atomic number and a high density, such as concrete, lead, and steel. The greater the density and thickness of the blocking material, the better the absorption/shielding of the gamma radiation.

French

Domaine(s)
  • Physique atomique
CONT

Le conditionnement des matières radioactives. Le conditionnement est un processus industriel qui met en œuvre : - un matériau de blocage qui immobilise les déchets. Ce matériau constitue la matrice - une (ou plusieurs) enveloppe(s), dans laquelle (lesquelles) les déchets immobilisés sont placés, facilitant ainsi principalement la manutention. L’ensemble est appelé colis.

Spanish

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Record 3 2011-07-21

English

Subject field(s)
  • Nuclear Fission Reactors
  • Nuclear Power Stations
DEF

A structure in which a fission chain reaction can be maintained and controlled. It usually contains a fuel, coolant, moderator, and control absorbers and is most often surrounded by a concrete biological shield to absorb neutron and gamma ray emission.

CONT

The nuclear fission reactor is possible because more neutrons are produced in fission than are needed to initiate it.

French

Domaine(s)
  • Réacteurs nucléaires de fission
  • Centrales nucléaires
DEF

Dispositif dans lequel une réaction de fission nucléaire en chaîne peut être entretenue et dirigée.

CONT

Dans le réacteur à fission nucléaire, on utilise, pour contrôler la réaction de fission nucléaire en chaîne, des barres contenant un absorbant énergique de neutrons.

Spanish

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Record 4 - external organization data 1994-10-07

English

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

penetrating atomic particles that result from collisions between cosmic rays and atoms in the atmosphere, and from some specialized man-made sources. This type of radiation is often used in portable nuclear gauges.

CONT

Neutron radiation is produced by the fission process in nuclear reactors. It is the form of radiation which can cause other materials to become radioactive. This property is used to create radioisotopes for medicine and industry. Water and concrete are used as a shield against neutron radiation from the reactor core.

Key term(s)
  • neutrons

French

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

particules atomiques pénétrantes résultant, soit de la collision entre les rayons cosmiques et les atomes de l'atmosphère, soit de certaines sources artificielles spéciales. Ils sont souvent utilisés dans les jauges nucléaires portatives.

CONT

Les neutrons peuvent aussi être très pénétrants. Ils sont produits par la fission dans les réacteurs nucléaires. Comme ils peuvent rendre d'autres matières radioactives, on les utilise pour préparer des radio-isotopes destinés à des applications médicales et industrielles. L'eau et le béton peuvent servir de bouclier efficace contre les neutrons qui proviennent du noyau des réacteurs.

Spanish

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Record 5 1992-12-02

English

Subject field(s)
  • Atomic Physics
  • Nuclear Fission Reactors
  • Aircraft Propulsion Systems
DEF

An effective cross section ascribed to a material inserted between a fission neutron source and a thick hydrogenous medium. It is used in the calculation of the relaxation length of the fast neutron flux density in a thick shield.

OBS

Term standardized by ISO.

French

Domaine(s)
  • Physique atomique
  • Réacteurs nucléaires de fission
  • Propulsion des aéronefs
DEF

section efficace effective attribuée à un matériaux interposé entre une source de neutrons de fission et un milieu hydrogéné de grande épaisseur.

OBS

Terme normalisé par l'ISO.

Spanish

Save record 5

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