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Cosa (chi) è neutron activation - definizione
Neutron activation
PROCESS IN WHICH NEUTRON RADIATION INDUCES RADIOACTIVITY IN MATERIALS
Neutron irradiation
Neutron activation is the process in which neutron radiation induces radioactivity in materials, and occurs when atomic nuclei capture free neutrons, becoming heavier and entering excited states. The excited nucleus decays immediately by emitting gamma rays, or particles such as beta particles, alpha particles, fission products, and neutrons (in nuclear fission).
Neutron activation analysis
SCIENTIFIC MEASUREMENT
Neutron Activation Analysis; Activation analysis; Activation Analysis; Neutron activation analysis (NAA); Neutron beam activation analysis; Instrumental Neutron Activation Analysis; Radiochemical Neutron Activation Analysis
Neutron activation analysis (NAA) is the nuclear process used for determining the concentrations of elements in many materials. NAA allows discrete sampling of elements as it disregards the chemical form of a sample, and focuses solely on atomic nuclei.
Prompt gamma neutron activation analysis
Prompt-gamma neutron activation analysis (PGAA) is a very widely applicable technique for determining the presence and amount of many elements simultaneously in samples ranging in size from micrograms to many grams. It is a non-destructive method, and the chemical form and shape of the sample are relatively unimportant.
Esempi dal corpus di testo per neutron activation
1. The House committee said neutron activation tests showed it was "highly likely" that the fragments from Connally‘s wrist came from a largely intact Mannlicher–Carcano bullet found on a stretcher at Parkland Hospital after first hitting Kennedy –– the so–called magic bullet –– and that the other fragments came from a second bullet that hit Kennedy in the head.