Since
bombard the sample to be tested, the stable atoms in the said
sample are activated as a result of being irradiated by rays, and turned into radioactive isotopes which emit Y-rays.
different elements, when activated, would emit Y-rays carrying
different amounts of energy, and if high-precision detectors
are used to measure the said Y-rays, different elements may be
distinguished. The activation method can be used to analyze
the trace elements and supertrace elements, displaying a sensi- tivity reaching as high as 10-6 0-13.
At present, this
to 10
method has been widely employed in such academic fields as
geo-cosmic science, material science, bio-environmental science,
archaeology and forensic medicine.
In China's Shang Dynasty, history tells there was no iron-
smelting yet. However, in the relics unearthed from the graves
of the Shang Dynasty the brass battle-axes with iron blades
were discovered. By means of neutronic activation analysis, it
has been verified that these were made from meteors; thus a
puzzling riddle is solved.
The human hair contains tiny amounts of metal elements,
such as sodium, gold, copper and zinc. An activation analysis`
has indicated that the content of the said metals in the hair
of each person is a constant. Even a very tiny amount of
arsenic not fatal to human life taken into human body,
will
be displayed in the hair. British scientists have detected
arsenic in the hair of Napoleon, which exceeds the usual amount
contained in the hair of common men.
Therefore, some people
P. 2
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