Term nuclear is referred to the nucleus,
which is the central part of an atom surrounded by electrons contain
most of its mass. According to the Einstein formula "E = MC2" if the nucleus of an atom is split-ed in two then a certain amount of that atoms mass is converted into energy.
History
1895 Roentgen discovers X-rays ,1898 The Curies identify 2 radioactive
nuclides, coin term "radioactive“ 1899 Rutherford distinguishes alpha
and beta radiation and discovers half-life, 1909 Rutherford discovers
that most mass is concentrated in a small nucleus.1920 Rutherford
theorizes a "neutron“ .1935 Chadwick identifies neutrons .
1938 Hann and
Strassman split uranium atoms with neutrons, Meitner and Frisch explain
what's happening and name it "fission“ 1939 Fermi and Szilard measure
neutron multiplication, conclude that a nuclear chain reaction is
possible .1939 Szilard, Wigner, and Teller convince Einstein to sign a
letter warning Roosevelt of possibility of nuclear weapons .1939
Roosevelt authorizes creation of Advisory Committee on Uranium, begins
US nuclear bomb effort (though not vigorously) .
1896 Becquerel discovers
rays emitted spontaneously from uranium salts .1942 Fermi achieves
first nuclear chain reaction in a squash court at U. of Chicago.
Manhattan project in full swing. Secret cities are built in Oak Ridge TN
(to enrich uranium), Hanford WA (to produce plutonium), and Los Alamos
NM (to design and assemble bomb) July. 1945 The world's first nuclear
weapon test, the Trinity shot, is successful .Aug 6 & 9, 1945 Atomic
bombs Little Boy and Fat Man dropped on Japanese cities, Hiroshima and
Nagasaki. Up to 240,000 people died.
What is Uranium and its types
Uranium
is a metal and it is a constituent of the most rock and sea,it is a
common element found in the crust of the earth like "zinc" and "tin".
Types
- Natural Uranium
- Reactor Grade Uranium
- Enriched Uranium
Natural Uranium is the one containing
same isotopic ration as found in nature and naturally it contains 0.7%
of Uranium-235 and 99.3% Uranium-238. As Uranium-235 is most important
to set off the nuclear reaction which is not enough, and Uranium-238
cannot start the nuclear reaction which is 99.3% of total.


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