Ask AI3: What is radioactivity?
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Critically invisible, modern revolt, like X-rays and radioactivity, is perceived only by its effects at more materialistic social levels, where it is called delinquency.
Owing to its strong radioactivity, actinium glows in the dark with a pale blue light, which originates from the surrounding air ionized by the emitted energetic particles.
The initial americium samples weighed a few micrograms ; they were barely visible and were identified by their radioactivity.
Elemental astatine has never been viewed, because a mass large enough to be seen ( by the naked human eye ) would be immediately vaporized by the heat generated by its own radioactivity.
A visible piece of astatine would be immediately and completely vaporized due to the heat generated by its intense radioactivity.
Analysts can discern the origins of natural and man-made isotopes in the study of environmental radioactivity.
Alpha particles were first described in the investigations of radioactivity by Ernest Rutherford in 1899, and by 1907 they were identified as He < sup > 2 +</ sup > ions.
This element of the actinide series was named after Marie Skłodowska-Curie and her husband Pierre Curie-both were known for their research on radioactivity.
For example, in the 19th century, the Sun appeared to be no more than 20 million years old, but the Earth appeared to be no less than 300 million years ( resolved by the discovery of nuclear fusion and radioactivity, and the theory of quantum mechanics ); or current attempts to resolve theoretical differences between quantum mechanics and general relativity.
The high radioactivity of einsteinium-253 produces a visible glow and rapidly damages its crystalline metal lattice, with released heat of about 1000 watts per gram.
The key observation hinged on on a repeatably greater radioactivity seen on a wooden table top than on an Italian marble table top, in Fermi's laboratory.
A fallout shelter is designed to allow its occupants to minimize exposure to harmful fallout until radioactivity has decayed to a safer level.
Frederick Soddy ( 2 September 1877 – 22 September 1956 ) was an English radiochemist and monetary economist who explained, with Ernest Rutherford, that radioactivity is due to the transmutation of elements, now known to involve nuclear reactions.
In 1900 he became a demonstrator in chemistry at McGill University in Montreal, Quebec, where he worked with Ernest Rutherford on radioactivity.
His work and essays popularising the new understanding of radioactivity was the main inspiration for H. G. Wells's The World Set Free ( 1914 ), which features atomic bombs dropped from biplanes in a war set many years in the future.
Thorium oxide gives glass a high refractive index and low dispersion and was formerly used in producing high-quality lenses, but due to its radioactivity has been replaced by lanthanum oxide in modern eye glasses.