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NEUTRON-NEUTRON LOG [2 records]

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Filter results by subject field

Alphabetical list of terms

Record 1 2012-05-24

English

Subject field(s)
  • Geophysics
CONT

As a result of neutron bombardment, a formation may emit either neutrons or gamma rays, or both. When gamma rays are detected, the resulting neutron log is called a neutron-gamma ray log. When neutrons are detected, the log is described as a neutron-neutron log.

OBS

The neutron-neutron log enables one to measure the moisture content of materials.

French

Domaine(s)
  • Géophysique
DEF

Mesure de la radiation induite dans les formations à la suite de leur bombardement par neutrons rapides.

Spanish

Save record 1

Record 2 1989-09-29

English

Subject field(s)
  • Geophysics
  • Geological Prospecting
DEF

A well log of the wall-contact log type that measures radioactivity induced by neutron-neutron reactions. Fast neutrons of several MeV energy, emitted by a source in the sonde, may be slowed and backscattered as epithermal neutrons(0. 4 to 100 ev) by collisions with hydrogen nuclei. Epithermal-neutron abundance is interpreted by assuming a constant lithology, usually limestone, that produces a continuous curve in porosity units. The epithermal-neutron log is largely insensitive to the differences in chlorinity of formation water that may hamper the interpretation of the thermal-neutron log and neutron-gamma log.

French

Domaine(s)
  • Géophysique
  • Prospection géologique
CONT

On peut, soit mesurer les rayons gamma de capture et on obtient un diagramme "Neutron-Gamma", soit mesurer les neutrons thermiques, on obtient un diagramme "Neutrons-Neutrons thermiques" ou bien encore les neutrons épithermiques (non encore complètement ralentis) qui donnent un diagramme "Neutrons-Neutrons épithermiques".

Spanish

Save record 2

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