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http://dbpedia.org/ontology/abstract Una sonda de neutrons és un tipus de que uUna sonda de neutrons és un tipus de que utilitza la . Aquestes sondes se solen utilitzar per mesurar el contingut d'aigua en el sòl o en la roca. La tècnica és no destructiva, i és sensible a la humitat de tot el material objectiu, i no pas només a la seva superfície. L'aigua, a causa del seu contingut d'hidrogen, és un moderador de neutrons efectiu, que alenteix els neutrons d'alta energia. Amb una font de neutrons d'alta energia i un detector sensible als neutrons de baixa energia (neutrons tèrmics), la taxa de detecció estarà governada pel contingut d'aigua del sòl entre la font i el detector. La típicament conté una petita quantitat d'un radionúclid. Les fonts poden emetre neutrons durant la fissió espontània, com passa amb el californi; alternativament, un pot ser mesclat amb un element lleuger per obtenir una reacció nuclear que doni neutrons en excés, tal com passa amb l'americi en una matriu de beril·li.a amb l'americi en una matriu de beril·li. , A neutron moisture meter is a moisture metA neutron moisture meter is a moisture meter utilizing neutron scattering. The meters are most frequently used to measure the water content in soil or rock. The technique is non-destructive, and is sensitive to moisture in the bulk of the target material, not just at the surface. Water, due to its hydrogen content, is an effective neutron moderator, slowing high-energy neutrons. With a source of high-energy neutrons and a detector sensitive to low-energy neutrons (thermal neutrons), the detection rate will be governed by the water content of the soil between the source and the detector. The neutron source typically contains a small amount of a radionuclide. Sources may emit neutrons during spontaneous fission, as with californium; alternatively, an alpha emitter may be mixed with a light element for a nuclear reaction yielding excess neutrons, as with americium in a beryllium matrix., as with americium in a beryllium matrix.
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rdfs:comment A neutron moisture meter is a moisture metA neutron moisture meter is a moisture meter utilizing neutron scattering. The meters are most frequently used to measure the water content in soil or rock. The technique is non-destructive, and is sensitive to moisture in the bulk of the target material, not just at the surface. target material, not just at the surface. , Una sonda de neutrons és un tipus de que uUna sonda de neutrons és un tipus de que utilitza la . Aquestes sondes se solen utilitzar per mesurar el contingut d'aigua en el sòl o en la roca. La tècnica és no destructiva, i és sensible a la humitat de tot el material objectiu, i no pas només a la seva superfície.ctiu, i no pas només a la seva superfície.
rdfs:label Neutron moisture gauge , Sonda de neutrons
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