In an Impressionist picture there is a certain amount of neutrality caused by mixing the colour of light with that of blue shadow; and this mixture heightens the scintillation of the ensemble.
In it he achieved the scintillation of light which is not linked with colour or painting, but which seems to arise, by some mysterious alchemy, from the surface of the canvas.
The solubility problem is also aggravated by the low temperatures at which liquid scintillation counters are usually operated for more effective instrument performance.
One disadvantage of liquid scintillation counting is that different compounds show different degrees of quenching (loss of emitted photons), and the effect must be checked for each class of compounds in each concentration range.
Illustration: Figure 18 Technician placing a tray of samples in a liquid scintillation counter.
The amount of radioactivity in the RNA fraction can then be determined by a technique known as liquid scintillation counting.
Liquid Scintillation Counting Liquid scintillation counting is the preferred method for the measurement of low-energy beta-emitting radioisotopes commonly used in cell-fractionation studies (see Figure 18).
Illustration: Figure 19 Placing radioactive samples in a refrigerated unit for liquid scintillation counting.
Liquid scintillation solutions share with other scintillating materials the property of converting into visible light the energy deposited in them by ionizing radiation.
One of the principal advantages of the liquid scintillation method is the ease of sample preparation.
Her eyes, which had a faint scintillation in them, were of a violet black, and her hair of the tint of ebony, though it was lustrous, too.
The patient lies down in a padded aluminum box and, only 4 minutes after the irradiation is concluded, a ring of 4 gamma-ray scintillation detectors[10] begin to measure the gamma rays emitted by his body.
The detectors are scintillation crystals that produce pulses of light proportional in intensity to the energy of the gamma ray absorbed in the crystal.
A scintillation detector is a crystalline device, usually sodium iodide containing a small amount of thallium, which has the property of emitting light when energy is absorbed from nuclear radiation.
The counter is a scintillation counter that is connected to a pulse-height analyzer.
They also amplify the weak electron disturbances into electrical pulses to operate meters that record each scintillation and count the total.
The liquid scintillation counter is large enough to contain a man and sensitive enough to detect even the minute amounts of his natural gamma radioactivity.
A trace of thallium added to the sodium iodide improves its scintillation properties.
When both these radionuclides are producing flashes of light in the scintillation fluid at once, the photomultiplier tubes produce two different strengths of electrical pulses.
These photons radiate from the collision scene and strike a light-sensitive surface in one or more of the counter’s photomultiplier tubes, which have been placed where they can “see” the scintillation liquid.
Illustration: B The subject may lie in a bed that slides into the end of a hollow cylindrical tank filled with scintillation fluid.
Liquid Scintillation Counting of Aqueous Solutions of Carbon-14 and Tritium, J.
Illustration: A The subject may be seated in a chair in an iron-shielded room and under a scintillation detecting crystal.
The number of light photons produced in the scintillation fluid is proportional to the energy transferred by the incoming gamma rays.
As their name suggests, photomultiplier tubes (see Figures 6 and 9) do more than merely respond to the light flashes produced in the scintillation liquid.
It also may fail to collide with any of the atoms in the molecules of scintillation liquid, of course.
Showing: Signal lights Lead glass windows Lead shield Scintillation shield Photomultiplier tube Solution storage tank under platform Shielding for the Geneva counter consisted of 3 inches of lead.
Encouraged by the scintillation of hope that thus gleamed in upon him, Rainford hurried back to the other end of the subterranean—ascended the spiral staircase—grasped his pistols—and listened attentively.
Tom Rain whistled a tune with an air of the most perfect indifference: but that abrupt change in Old Death's features—that scintillation of delight, momentary as its expression was, had not escaped the notice of the highwayman.
The scattered mesons are counted by a scintillation counter at C.
Scintillation counters at A, B, C, D, and E record the passage of charged particles.
Scintillation counters at A and B record the passage of a proton, thus defining its direction.
Or if he did manifest a scintillation of his former spirit, it was merely to command his wife to leave him to his own meditations.
I have often seen at Cumana a great scintillation of the stars of Orion and Sagittarius, when Saussure's hygrometer was at 85 degrees.
It is remarkable enough, that, in northern countries, at a time when the atmosphere appears perfectly dry, the scintillation is most decided in very cold weather.
I have not observed any direct relation between the scintillation of the stars and the dryness of that part of the atmosphere open to our researches.
The comparative absence of scintillation in warm countries was noticed by Humboldt.
Francois Arago, as long as forty or fifty years ago, conclusively established the fact that scintillation is the simplest thing in the world,--merely a matter of atmosphere.
Scintillation there was none, except in the immediate vicinity of the eastern horizon, where I still saw them through a dense atmosphere.
The scintillation so characteristic of the fixed stars, especially in the temperate climates of the Earth, was scarcely perceptible.
One, of an unrivalled blue, with a head of rubies, outvies with its scintillationthe red-hot coal.
The eloquent appeal of the ingenious arts of the Insect, of its powers of love so vividly manifested through its wings and colours, in the brilliant scintillation with which it enkindles our nights.
La bourse" she repeated, softly smiling, but with a scintillation of the eyes in resentment of his scrutiny.
No," said Aurora, with a scintillationof irrepressible mischief in her eyes.
Thank you," said Archie, with a faint scintillation of his old ideas of fun.
So must an Eternal Being regard the scintillation of the stars and the periodic vibration of life in our geological time and the most enduring efforts of thought.
The enormous (to our ideas) thermal energy of the stars resembles the scintillation of iron dust in a jar of oxygen when a pinch of the dust is thrown in.
In the analogy which the exquisite had drawn there was a scintillation of intellect--the more striking that it was not expected from such a source.
Rather with a frown did she receive him; and in her eyes might have been detected the slightest scintillation of anger, whether or not he was its object.
The spiritual man needs, therefore, something more than a cultivated sympathy with the brighter scintillation of things.
With the spell of her voice, of her eyes, of her radiant face upon him, Cameron's scintillation faded and snuffed out.
In the midst of his scintillation he abruptly paused and sat listening.
I saw clearly that it had required all the influence of my danger and suffering, to extract from him one scintillation of humane feeling.
He rubbed the palms of his hands together as he had over the scintillation of the jewelry counters.
At times the gleam of the brasswork would exercise the same hypnosis over his senses as the scintillation of the jewelry counters of the store, and he would rub his hands crisply together.
Framed between pillars and architrave, great rectangles of sky are seen, interstellar azure, and the countless scintillation of stars.
One complication with that is that you have to remove the radium dials from the instrument panel of your plane to keep leakage from interfering with your scintillation readings.
