Americium-241, an alpha emitter, is used in smoke detectors.

Americium-241, an alpha emitter, has a half-life of 432 years.

Americium-241 used in a smoke detector.

Americium-241 is the most prevalent isotope of americium in nuclear waste.

only the counter at one end was lighted by a long fluorescent tube suspended directly above it.

At last, when I put it to him directly, the clerk was forced to admit that the delay in my case was unusual.

Now, the next morning, they were anchored at The Elbow and the boat was riding directly over the underwater ledge where the green water turned to deepest blue and the cliff dropped straight down 600 fathoms, with the weighted line beside it ; ;

Miriam had not yet goaded him into mentioning her directly, but one can feel the generalized anger in Wright's remarks to reporters when he was asked, one morning on arrival in Chicago, what he thought of the city as a whole.

From his first bout with the canny Woodruff, Pike had learned that it was better not to attack him directly, so, harping on the theme that the cost of printing was too high, he condemned the governor for permitting such a state of affairs to exist.

That was in the days before blood banks, of course, and transfusions had to be given directly from donor to patient.

The failure of Greece to reach the imperial destiny that Periclean Athens had seemed to promise was almost directly attributable to her physical conformation.

Under the trees, there was a dead redcoat, a young boy with a pasty white skin and a face full of pimples, who had taken a rifle ball directly between the eyes.

but a few seconds later she was standing directly across the room from me, looking me in the eyes and saying in a scathingly condemnatory tone, `` Your father despises you ''!!

Eventually it became clear to me, partly with the aid of another schizophrenic patient who could point out my condescension to me somewhat more directly, that this man, with his condescending, `` You're welcome '', was very accurately personifying an element of obnoxious condescension which had been present in my own demeanor, over these months, on each of these occasions when I had bid him good-bye with the consoling note, each time, that the healing Christ would be stooping to dispense this succor to the poor sufferer again on the morrow.

The raw sewage was introduced directly under the turbine aerator to insure maximum mixing of the raw sewage with the aeration tank contents.

Madden explained that he was thinking of an application sent directly to Mrs. Meeker.

There should be an excited conversation, for somewhere, directly below them, was a treasure lost for more than four hundred years.

But the tardiness of the administration in making the dedication has caused legislators to suspect the tax bill was related more directly to an over-all shortage of cash than to segregation.

To ask me to believe that so inexpressibly marvelous a book was written long after all the events by some admiring follower, and was not inspired directly by the Spirit of God, is asking me to accept a miracle far greater than any of those recorded in the Bible.

Moseley, after discussions with Bohr who was at the same lab ( and who had used Van den Broek's hypothesis in his Bohr model of the atom ), decided to test Van den Broek and Bohr's hypothesis directly, by seeing if spectral lines emitted from excited atoms fit the Bohr theory's demand that the frequency of the spectral lines be proportional to a measure of the square of Z.

However, he was never able to make a living with his art, and, as he began to perceive most of the proletarian movement as " putting unfulfilled political ideals directly onto the canvas ", he lost his enthusiasm for painting.

Since the evolution of the Aramaic alphabet out of the Phoenician one was a gradual process, the division of the world's alphabets into those derived from the Phoenician one directly and those derived from Phoenician via Aramaic is somewhat artificial.

Schweitzer's passionate quest was to discover a universal ethical philosophy, anchored in a universal reality, and make it directly available to all of humanity.

The election was for life, unless the abbot was canonically deprived by the chiefs of his order, or when he was directly subject to them, by the pope or the bishop.

The only extended view possible to anyone less tall than the fences was that obtained from an upper bough of the apple tree.

Peters insisted that this impression was a great misunderstanding, and evidently, from the quarrel, obtained an unfavorable impression of Morgan's judgment.

It would, however, reach the proctors and other officers in charge of the public-school performances of the incepting bachelors, and the place that any individual obtained in the lists depended greatly on how he comported himself in the public schools during his acts therein as he was incepting.

It differed from what an undergraduate receives today from any American college or university mainly in the certainty of what he was forced to learn compared with the loose and widely scattered information obtained today by most of our undergraduates.

That such expansion can be obtained without a raise in taxes is due to growth of the tax digest and sound fiscal planning on the part of the board of commissioners, headed by Chairman Charles O. Emmerich who is demonstrating that the public trust he was given was well placed, and other county officials.

It embraced determining when to purchase and when to trade vehicles, who was to drive, when and where repairs were to be made, where gasoline and automobile services were to be obtained and other allied matters.

Such a group of thermometers was obtained and calibrated at the Aj.

It is presumed that this negative head was associated with some geometric factor of the assembly, since different readings were obtained with the same fluid and the only apparent difference was the assembly and disassembly of the apparatus.

One measurement at 40 Mc/sec was obtained with the Varian model Af unit.

A single measurement of the spin - spin relaxation time Af was obtained at 10 Mc/sec by pulse methods.

This measurement was obtained by W. Blumberg of the University of California, Berkeley, by observing the breadth of the free induction decay signal.

Spectra were also obtained from a sample in a spherical container which was made by blowing a bubble on the end of a capillary glass tube.

To prepare the latter, silver chloride was precipitated from a solution containing Af obtained from the Oak Ridge National Laboratory.

In addition one serum was obtained from a donor ( R. E. ) who had been sensitized 6 years previously.

The deep concave gradient employed ( fig. 2 ) was obtained with a nine-chambered gradient elution device ( `` Varigrad '', reference ( 8 ) ) and has been described elsewhere.

In that year a grant was obtained from the Penrose Fund of the Geological Society of America to finance additional full-time workers.

He said evidence was obtained `` in violation of the legal rights of citizens ''.

Returning to the school crossing, the officer was informed by the Sisk boy that he recognized the driver, a neighbor, and had obtained the license number.

Nobel later on combined nitroglycerin with various nitrocellulose compounds, similar to collodion, but settled on a more efficient recipe combining another nitrate explosive, and obtained a transparent, jelly-like substance, which was a more powerful explosive than dynamite.

His real name was Muhammad bin Da ' ud Chaghri, and for his military prowess, personal valour, and fighting skills he obtained the surname Alp Arslan, which means " Heroic Lion " in Turkish.

The simplest alcohol is methanol,, which was formerly obtained by the distillation of wood and, therefore, is called " wood alcohol ".

This value of the astronomical unit had to be obtained experimentally and so is was not known exactly.