by the detector. Its sensitivity represents an increase of 5-6
orders-of-magnitude as compared with the conventional mass-
spectrometer, can reach as high as 10-15. This technology is
mainly used in rare elements and age determination.
As compared
with the age-determining method by radioactive carbon-14, this
technology needs a very tiny amount of sample. It can detect
This is a very
the abundance ratio of helium-3 in the nature.
interesting subject to those engaged in the fields such as
celestial chemistry, geo-chemistry and helium-method for mineral
prospecting.
Nuclear-Physics Effects
Mössbauer effect: the non-recoil resonance absorption
phenomenon of certain stable isotopes of the y-rays emitted by
the radioactive nuclei of the identical elements; so named
after the West Germen physicist Mössbauer. Its energy resolution
10-15, capable of giving physical and chemical
reaches 10
12
It
information of the microscopic structure of the substance.
has become the powerful means for basic research of many academic
branches, widely applied in material science, geology, chemistry
and bio-medicine. The hexahedronic diagrams of strontium ferrite
achieved by this method indicates clearly the occupation of
ferrous ions in this magnetic meterial, as well as the spinning
directions of the ferrous ions when different techniques are
employed.
P. 7
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