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In the first step, the S-50 uranium enrichment facility used the thermal diffusion process to enrich the uranium from 0. 7 % up to nearly 2 % < sup > 235 </ sup > U. This product was then fed into the gaseous diffusion process at the K-25 plant, the product of which was around 23 % < sup > 235 </ sup > U. Finally, this material was fed into calutrons at the Y-12.
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first and step
All seven recognized that independence was but the first step toward building a nation.
Noting such evidence is the first step ; ;
This involves a shift in Patchen's attitude and it is a first step toward writing a new jazz poetry.
If the decision goes wrong, it may be -- as Mr. Stevenson fears -- `` the first step on the slippery path downhill '' to a U.N. without operational responsibilities and without effective meaning.
A united Germany, freed of militarism, might be the first step toward disarmament and peace in a terrorized and tortured world.
Since accurate base maps are necessary for any planning program, the first step taken by the planning division to implement the long-range state plan has been to prepare two series of base maps -- one at a scale of 1 inch to a mile, and the second a series of 26 sheets at a scale of 1 inch to 2000 feet, covering the entire state.
As a first step toward this goal, arrangements were worked out for comparing the scales now in use through circulation of a group of standard platinum resistance thermometers for calibration by each national laboratory.
The first step is a comprehensive self study made by faculty, by outside consultants, or by a combination of the two.
The first step in using a formula is to insert the numerical values of the factors involved in their correct positions in the formula.
But the Russians use gymnastics as the first step in training for all other sports because it provides training in every basic quality except one, endurance.
To learn what we do is the first step for improvement.
The first step in processing was to analyze the returns from Questions 1, 2, and 3 to determine whether the respondents were large businesses or small businesses, in accordance with the definitions contained in ASPR Section 1-701.
Almost the first step in the corruption of Pip's values is the unworthy shame he feels when Estella cruelly remarks the coarseness of his hands: `` They had never troubled me before, but they troubled me now, as vulgar appendages ''.
The first step toward the goal is the establishment of a new atmosphere of mutual good will and friendly communication on other than the polemical level.
The Soviets understand, moreover, that the first step in turning a country toward Communism is to turn it against the West.
Of the two, Porter is justly the better known, for he went far beyond the vital finding of fiction for films to take the first step toward fashioning a language of film, toward making the motion picture the intricate, efficient time machine that it has remained since, even in the most inept hands.
A petition bearing the signatures of more than 1,700 Johnston taxpayers was presented to the town council last night as what is hoped will be the first step in obtaining a home rule charter for the town.
The Old Man's son threw himself down, belly first, upon a concrete step, taking in the coolness of it, and dreaming of the day he would be rich.
He also introduced cyclic cohomology in the early 1980s as a first step in the study of noncommutative differential geometry.
As a first step, Algerian literature was marked by works whose main concern was the assertion of the Algerian national entity, there is the publication of novels as the Algerian trilogy of Mohammed Dib, or even Nedjma of Kateb Yacine novel which is often regarded as a monumental and major work.
The adult eyes are an improvement on invertebrate eyes and were a first step in the development of more advanced vertebrate eyes.
Early evidence of such practices appears as markings on bones and cave walls, which show that lunar cycles were being noted as early as 25, 000 years ago ; the first step towards recording the Moon ’ s influence upon tides and rivers, and towards organizing a communal calendar.
In 1236 or 1237, aged about 50, he made the surprising step of entering the Franciscan order, thus becoming the first Franciscan to hold a University chair.
The first step is ligating the supplying artery and vein, to prevent hemorrhage ( bleeding ).
Since electricity is an expensive utility, the first step towards conservation is to design a house and lifestyle to reduce demand.
first and uranium
In the first episode of Daria, she and her family move from Beavis and Butt-Head's hometown of Highland to Lawndale — the only references to the original show is a single mention of Highland in the first episode, with Daria saying Lawndale can't be a second Highland " unless there's uranium in the drinking water here too ".
The first 98 elements have been detected directly on Earth as primordial nuclides present from the formation of the solar system, or as naturally-occurring fission or transmutation products of uranium and thorium.
The money was used in studies which led to the first nuclear reactor — Chicago Pile-1, a massive " atomic pile " of graphite bricks and uranium fuel which went critical on December 2, 1942.
Monazite is important in two ways: first, as a REE " sink ", it can be sufficiently concentrate these elements to become an ore ; secondly, monazite group elements can incorporate relatively large amounts of uranium and thorium, which can be used to date the rock based on the decay of the U and Th to lead.
In September 2002, researchers at the Los Alamos National Laboratory briefly created the first known nuclear critical mass using neptunium in combination with shells of enriched uranium ( U-235 ), discovering that the critical mass of a bare sphere of neptunium-237 " ranges from kilogram weights in the high fifties to low sixties ," showing that it " is about as good a bomb material as U-235.
Promethium was first produced and characterized at Oak Ridge National Laboratory in 1945 by the separation and analysis of the fission products of uranium fuel irradiated in a graphite reactor.
The hot fusion reaction using a uranium target was first reported at Dubna in 2000:
The first nuclear bomb used in war, Little Boy, relied on uranium fission, while the very first nuclear explosive ( The gadget ) and the bomb that destroyed Nagasaki ( Fat Man ) were plutonium bombs.
In 1841, Eugène-Melchior Péligot, Professor of Analytical Chemistry at the Conservatoire National des Arts et Métiers ( Central School of Arts and Manufactures ) in Paris, isolated the first sample of uranium metal by heating uranium tetrachloride with potassium.
The first large-scale separation of uranium isotopes was achieved by the United States in large gaseous diffusion separation plants at Oak Ridge Laboratories, which were established as part of the Manhattan Project.
At Oak Ridge and at the University of California, Berkeley, Ernest O. Lawrence developed electromagnetic separation for much of the uranium used in the first United States atomic bomb ( see Manhattan Project ).
Enriched uranium was first manufactured in the early 1940s when the United States began its nuclear weapons program.
It was at this time that depleted uranium was first stored as an unusable waste product ( uranium hexafluoride ).
The very first uranium bomb, Little Boy dropped on Hiroshima in 1945, used 64 kilograms of 80 % enriched uranium.
Giant calutron plants developed at Lawrence's laboratory were used at Oak Ridge National Laboratory | Site X during World War II to Enriched_uranium # Enrichment_methods | purify uranium for use in the first atomic bomb.
The laboratory developed the Calutron s used at Y-12 in Oak Ridge, Tennessee to create enriched uranium for the first atomic bombs.
Graham's law was the basis for separating < sup > 235 </ sup > U from < sup > 238 </ sup > U found in natural uraninite ( uranium ore ) during the Manhattan project to build the first atomic bomb.
In this plant, uranium from uranium ore was first converted to uranium hexafluoride and then forced repeatedly to diffuse through porous barriers, each time becoming a little more enriched in the slightly lighter < sup > 235 </ sup > U isotope.
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