New Zealand and oceanic obsidians : An archaeological perspective using neutron activation analysis . " Journal of the Royal Society of New Zealand " 26 ( 1 ) : 79 105.
32.
Alvarez had access to the nuclear chemists at the Lawrence Berkeley Laboratory and was able to work with Frank Asaro and Helen Michel, who used the technique of neutron activation analysis.
33.
Some of the more sophisticated analyzers use prompt gamma neutron activation analysis ( PGNAA ) or pulsed fast thermal neutron activation ( PFTNA ) to determine the elemental content of the coal.
34.
In some cases irradiated samples are subjected to chemical separation to remove interfering species or to concentrate the radioisotope of interest, this technique is known as "'Radiochemical Neutron Activation Analysis "'( RNAA ).
35.
The samples were sent to Oak Ridge National Laboratory, where neutron activation analysis revealed traces of arsenic, but at levels less than one percent of the level expected in a death by poisoning.
36.
"' 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.
37.
Then measurement of major and trace and rare-earth ( REE ) elements are conducted by using instruments like atomic absorption spectroscopy ( AAS ), X-ray fluorescence ( XRF ), neutron activation analysis ( NAA ) etc.
38.
Michael D . Glascock, of the University of Missouri Research Reactor Center at the University of Missouri ( which performs neutron activation analysis ), has divided Mesoamerica into nine sub-regions with one or more obsidian sources in each.
39.
In the 1980s two primary groups of Eastern Terra Sigillata in the Eastern Mediterranean basin were distinguished as ETS-I and ETS-II based on their chemical fingerprints as shown by analysis by instrumental neutron activation analysis ( INAA ).
40.
After this, he and his wife Eva moved to Bell Telephone Laboratories, Allentown, Pennsylvania, where he made contributions to electrochemistry and anodic oxidation of silicon, was expert in neutron activation analysis, and published many papers, till his retirement in 1982.
