The instrument for X-ray fluorescence analysis has been modified to permit analysis of selected areas on the objects.
This instrument produces, detects, and records the object's X-ray fluorescence spectrum, which is characteristic of its composition.
X-ray fluorescence analysis, response to a magnet, reaction to nitric acid, and the Vickers pyramid hardness test were among the methods of analysis used that involved no damage to the objects.
This fluorescence is detected by a silicon crystal in the detector and dispersed into a spectrum, which is displayed on an oscilloscope screen.
The greenfluorescence on the sides of the tube opposite the anticathode, though not caused by the X-rays, demonstrate their presence.
The Alpha-rays possess ninety-five per cent of the energy evolved and produce brilliant fluorescence in zinc sulphide, diamond, etc.
It shows a delicate fluorescence in alkaline solutions; -- called also paviin.
The alkaline solution had an intense green fluorescence with delicate shades of pink by transmitted light.
Dissolved in water it shows a weak green fluorescence which in alkaline solution becomes much deeper but not by any means so strong as that of fluoresceïn.
The concentrated alkaline solution had a deep red color without fluorescence and acted as a red dye stuff.
Phosphorescence and fluorescence seem especially to result from the alpha and beta rays, particularly from the alpha rays, to which belongs the most important part of the total energy of the radiation.
But he soon perceived that the effect of the fluorescence was not instantaneous, and that the lapse of time might form a great source of error, and he then had recourse to indirect methods.
There was no intensifying or diminishing effect of twenty milligrams of radium (probably the bromide) on a luminous solution of Cypridina material, nor was phosphorescence or fluorescence excited in a non-luminous extract of the animal.
Fluorescence is most efficiently excited by the cathode rays of a vacuum tube.
A trace of alkali usually increases and acid inhibits the fluorescence of solutions.
Phosphorescence is exhibited chiefly by solids, fluorescence also by liquids and vapors.
It is difficult to realize that the bluish fluorescence of quinine sulphate is really an emission rather than a reflection of light.
We must conclude that animal light is not a fluorescence of any substance due to radiation produced by the animals themselves.
The samples of the above four substances all showed fluorescence in presence of radium rays, but only the ZnS phosphoresces after exposure to light rays, although the willemite was phosphorescent after exposure to the ultra-violet.
It was a cylindrical projectile, with stream-fluorescence propelling it upward, an unusual form of spaceship.
The fluorescence from them streamed along our hull and down past the stern, like twin rocket tails.
If this test is performed in a test-tube, a green-yellow fluorescence is also seen on the sides of the test-tube.
Muscarine is isomeric with betain and oxycholin, from which it is separated by its fluorescence and poisonous properties.
Researches in synthetical organic chemistry have shown that this property of fluorescence is common to an immense number of substances, and theories have been proposed whose purpose is to connect the property with constitution.
Sir John Herschel first noticed and described the fluorescence of the sulphate of quinine, and showed that the light proceeded from a thin stratum of the solution adjacent to the surface where the light enters it.
The second kind of fluorescence is the most common, and is exhibited by bodies which show absorption only in the upper part of the spectrum, i.
There appears to be some prospect of light being thrown on the question of molecular structure by experiments on the fluorescence of vapours.
He concluded that the gases are due to the decomposition of an organic colouring matter, which has, however, no connexion with the fluorescence or thermo-luminescence of the mineral.
Voigt has sought to give a theory of fluorescence depending on the theory of electrons.
No complete theory of fluorescence has yet been given, though various attempts have been made to explain the phenomenon.
Fluorescence is always associated with absorption, but many bodies are absorbent without showing fluorescence.
No fluorescence was observed as long as the tube remained in the more luminous portion, but as soon as the violet was reached, a ghost-like gleam of blue light shot right across the tube.
Barium platinocyanide, which is much used in the fluorescent screens employed in work with the Rontgen rays, shows a brilliant green fluorescence with ordinary light.
To examine the nature of the fluorescence produced by quinine, Stokes formed a pure spectrum of the sun's rays in the usual manner.
A familiar example of fluorescence is provided by paraffin-oil, which glows with a blue light when it is illuminated with ordinary sunlight or daylight.
With other substances the glow will only continue for a very small fraction of a second, so that it is impossible to {60} say wherefluorescence ends and where phosphorescence begins.
The fact that only a limited range of waves produces fluorescence explains a noticeable characteristic of the phenomenon.
Wood, Physical Optics: the chapters onFluorescence and Phosphorescence, Laws of Radiation, Nature of White Light, and Absorption of Light.
It has been found that the immediate source of the rays is the fluorescence and phosphorescence of the glass, and they are more effective when the fluorescence is greenish-yellow or canary colour.
If the quantity is increased beyond something like the proportion stated, the fluorescence becomes less and very soon disappears.
Bubbles coloured with fluorescine, or uranine, do not show their brilliant fluorescence unless sunlight or electric light is concentrated upon them with a lens or mirror.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "fluorescence" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: fluorescence; illumination; light; luminescence; phosphor; phosphorescence; wisp
