Since the age of the object is usually the most significant detail, they try to use radiocarbon dating or neutron activation analysis to find out the real age of the object.
32.
Since the matrix effect can be corrected for by observing the decay spectrum, little or no sample preparation is required for some samples, making neutron activation analysis less susceptible to contamination.
33.
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.
34.
New Zealand and oceanic obsidians : An archaeological perspective using neutron activation analysis . " Journal of the Royal Society of New Zealand " 26 ( 1 ) : 79 105.
35.
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.
36.
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 ).
37.
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.
38.
"' 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.
39.
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.
40.
According to them, " The centre will comprise a 10MW light-water reactor working on 20 %-enriched uranium-235, an activation analysis laboratory, a medical isotope production laboratory, silicon doping system, nuclear waste treatment and burial facilities ".
