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TRACE DECAY [3 records]
Record 1 - internal organization data 2015-12-11
Record 1, English
Record 1, Subject field(s)
- Geochemistry
- Analytical Chemistry
- Nuclear Physics
Record 1, Main entry term, English
- instrumental neutron activation analysis
1, record 1, English, instrumental%20neutron%20activation%20analysis
correct
Record 1, Abbreviations, English
- INAA 1, record 1, English, INAA
correct
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 CONT
Instrumental neutron activation analysis(INAA) is used to determine the concentration of trace and major elements in a variety of matrices. A sample is subjected to a neutron flux and radioactive nuclides are produced. As these radioactive nuclides decay, they emit gamma rays whose energies are characteristic for each nuclide. Comparison of the intensity of these gamma rays with those emitted by a standard permit a quantitative measure of the concentrations of the various nuclides. 2, record 1, English, - instrumental%20neutron%20activation%20analysis
Record number: 1, Textual support number: 1 OBS
If NAA [neutron activation analysis] is conducted directly on irradiated samples it is termed Instrumental Neutron Activation Analysis (INAA). 3, record 1, English, - instrumental%20neutron%20activation%20analysis
Record number: 1, Textual support number: 2 OBS
instrumental neutron activation analysis (INAA): term and abbreviation used at Natural Resources Canada - Earth Sciences Sector. 4, record 1, English, - instrumental%20neutron%20activation%20analysis
Record 1, French
Record 1, Domaine(s)
- Géochimie
- Chimie analytique
- Physique nucléaire
Record 1, Main entry term, French
- analyse par activation neutronique instrumentale
1, record 1, French, analyse%20par%20activation%20neutronique%20instrumentale
correct, feminine noun
Record 1, Abbreviations, French
- INAA 2, record 1, French, INAA
correct, feminine noun
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
L'évolution des performances de l'analyse par activation neutronique instrumentale ou INAA est étroitement liée à celle des appareils de mesure et en particulier à celle des moyens de détection. Les développements de la spectrométrie gamma à haute résolution, dus à l'utilisation des détecteurs semiconducteurs, ont fait de l'INAA une méthode non destructive, très sensible et multiélémentaire, très efficace pour le dosage des éléments en trace dans les matériaux géologiques. 2, record 1, French, - analyse%20par%20activation%20neutronique%20instrumentale
Record number: 1, Textual support number: 1 OBS
analyse par activation neutronique instrumentale : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre. 3, record 1, French, - analyse%20par%20activation%20neutronique%20instrumentale
Record 1, Spanish
Record 1, Campo(s) temático(s)
- Geoquímica
- Química analítica
- Física nuclear
Record 1, Main entry term, Spanish
- análisis por activación neutrónica instrumental
1, record 1, Spanish, an%C3%A1lisis%20por%20activaci%C3%B3n%20neutr%C3%B3nica%20instrumental
correct, masculine noun
Record 1, Abbreviations, Spanish
- AANI 1, record 1, Spanish, AANI
correct, masculine noun
Record 1, Synonyms, Spanish
Record 1, Textual support, Spanish
Record number: 1, Textual support number: 1 CONT
Análisis por activación neutrónica instrumental (AANI) [...] es una técnica de referencia multielemental, de elevada sensibilidad, precisión y selectividad. No destruye la muestra y requiere pequeñas masas [...] Entre las ventajas del AANI cabe mencionar además que es una técnica no destructiva, de aplicación en muestras biológicas sin digestión ácida previa y en suspensiones y soluciones no acuosas, a la vez que se pueden analizar muestras de matrices muy diversas utilizando la misma metodología. Por otro lado, los límites de detección son significativamente inferiores a los permitidos por la espectrofotometría de absorción atómica. 1, record 1, Spanish, - an%C3%A1lisis%20por%20activaci%C3%B3n%20neutr%C3%B3nica%20instrumental
Record 2 - internal organization data 2012-05-28
Record 2, English
Record 2, Subject field(s)
- Cognitive Psychology
- Nervous System
Record 2, Main entry term, English
- trace decay
1, record 2, English, trace%20decay
correct
Record 2, Abbreviations, English
Record 2, Synonyms, English
Record 2, Textual support, English
Record number: 2, Textual support number: 1 CONT
Trace decay... [The authors] suggested that forgetting in STM [short term memory] is due to trace decay. Learning something creates a memory trace or engram, which gradually fades. 2, record 2, English, - trace%20decay
Record 2, French
Record 2, Domaine(s)
- Psychologie cognitive
- Système nerveux
Record 2, Main entry term, French
- déclin de la trace
1, record 2, French, d%C3%A9clin%20de%20la%20trace
correct, masculine noun
Record 2, Abbreviations, French
Record 2, Synonyms, French
- déclin de la trace mnésique 2, record 2, French, d%C3%A9clin%20de%20la%20trace%20mn%C3%A9sique
correct, masculine noun
Record 2, Textual support, French
Record number: 2, Textual support number: 1 CONT
Déclin de la trace mnésique. Cette hypothèse, très largement admise comme un des facteurs d'oubli, suppose que les «traces mnésiques» disparaissent progressivement et deviennent donc inaccessibles si aucune activité particulière vient les rafraîchir, c'est-à-dire les réactiver. 3, record 2, French, - d%C3%A9clin%20de%20la%20trace
Record 2, Spanish
Record 2, Textual support, Spanish
Record 3 - internal organization data 2010-02-10
Record 3, English
Record 3, Subject field(s)
- Analytical Chemistry
- Radiological Physics (Theory and Application)
Record 3, Main entry term, English
- lifetime measurement
1, record 3, English, lifetime%20measurement
correct
Record 3, Abbreviations, English
Record 3, Synonyms, English
Record 3, Textual support, English
Record number: 3, Textual support number: 1 CONT
NIST [National Institute of Standards and Technology] researchers have implemented a novel approach to cavity ring-down spectroscopy(CRDS) using pulsed lasers. The ring-down method exploits the finite lifetime of light within an optical resonator, which is manifest as an exponential decay of the photon flux exiting the cavity. This lifetime measurement can be used to determine the presence of trace quantities of gaseous molecules, because the photon lifetime decreases as a result of light absorption within the cavity. 2, record 3, English, - lifetime%20measurement
Record number: 3, Textual support number: 1 OBS
Lifetime measurement. The activity (in decays per second) of some radioactive samples varies in time in a particularly simple way. If the activity (R) in decays per second of a sample is proportional to the amount of radioactive material (R [alpha] N, where N is the number of radioactive nuclei), then the activity must decrease in time exponentially … 3, record 3, English, - lifetime%20measurement
Record 3, French
Record 3, Domaine(s)
- Chimie analytique
- Physique radiologique et applications
Record 3, Main entry term, French
- mesure du temps de vie
1, record 3, French, mesure%20du%20temps%20de%20vie
correct, feminine noun
Record 3, Abbreviations, French
Record 3, Synonyms, French
- mesure de temps de vie 2, record 3, French, mesure%20de%20temps%20de%20vie
correct, feminine noun
Record 3, Textual support, French
Record number: 3, Textual support number: 1 OBS
Dans la mesure du temps de vie avec un faisceau de positons lents, plusieurs méthodes sont utilisées pour générer un signal qui marque l’entrée du positon dans le solide. Par exemple, la détection des électrons secondaires émis lors de l’entrée du positon dans le solide permet d’obtenir une résolution en temps de l’ordre de 500 ps [picosecondes]. Cette résolution est suffisante pour l’étude des polymères mais reste insuffisante pour les métaux ou les semi-conducteurs, matériaux pour lesquels les temps de vie du positon sont de l’ordre de 100 ps à 250 ps. 3, record 3, French, - mesure%20du%20temps%20de%20vie
Record 3, Spanish
Record 3, Textual support, Spanish
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