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Detectability of Extraterrestrial Technological Activities
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Topic: Detectability of Extraterrestrial Technological Activities (Read 698 times)
Jennifer Murdoch
Superhero Member
Posts: 5235
Re: Detectability of Extraterrestrial Technological Activities
«
Reply #30
on:
February 04, 2010, 01:24:55 pm »
Drake proposed the used of Technetium (Tc) for this purpose. This
element is not found on Earth and its presence is observed very
weakly in the Sun, in part because it is short-lived. Tc's most
stable form decays radioactively within an average of twenty
thousand years. Thus, for the case of Tc, we need to distribute
some 1.3x10exp11 grams, or 1.3x10exp5 tons, of this element into the
stellar spectrum. However, technetium lines have not been found in
stars of solar spectral type, but rather only in peculiar ones known
as S stars. We must know more than we do about both normal and
peculiar stellar spectra before we can reasonably conclude that the
presence of an unusual atom in an stellar spectrum is a sign of
extraterrestrial intelligence.
Whitmire and Wright (1980) considered the possible observational
consequences of galactic civilizations which utilize their local
star as a repository for radioactive fissile waste material. If a
relatively small fraction of the nuclear sources present in the
crust of a terrestrial-type planet were processed via breeder
reactors, the resulting stellar spectrum would be selectively
modified over geological time periods, provided that the star has a
sufficiently shallow outer convective zone. They have estimated
that the abundance anomalies resulting from the slow neutron fission
of plutonium-239 and uranium-233 could be duplicated (compared with
the natural nucleosynthesis processes), if this process takes place.
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