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How Tungsten X-ray Collimator Works

Details: Category: Tungsten Information; Published on Monday, 20 July 2015 14:33; Written by wenjing; Hits: 344

A collimator is a device that limits the radiation output of an X-ray source. Without a collimator, X-rays would escape which would flood the detector with radiation and prevent a clear image from being attained. Due to tungsten alloy material has high density, excellent radiation attenuation properties, and environmental friendly; an X-ray collimator can be made from tungsten alloy. Tungsten X-ray collimator can be commonly done by standing thin tungsten on end in a sequence over the detectors to limit scatter. Tungsten X-ray collimator can prevent cross talk between detector cards in a detector bank within a medical or security application. This allows tungsten X-ray collimator to be protected from scatter radiation and only detect the radiation striking the detector straight on.

The picture shows thin tungsten in X-ray collimator:

thin tungsten in X-ray collimator

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Tungsten Radiation Shielding Parts

Details: Category: Tungsten Information; Published on Monday, 20 July 2015 14:30; Written by wenjing; Hits: 322

Radiation shields help a temperature sensor accurately measure air temperature without the effects of direct radiation. Due to tungsten material has high density, excellent radiation attenuation properties, and environmental friendly; it is widely used to produce radiation shielding parts.Tungsten radiation shielding parts are made from high quality tungsten heavy alloys. Tungsten alloys are stable at high temperatures. You can use one-third less material than lead for the same energy-absorbing effectiveness.

Details of Tungsten Radiation Shielding Parts:

Details of Tungsten Radiation Shielding Parts

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Edison's Tungstate of Calcium Lamp - The Nernst Lamp - Radium, Polonium and Actinium

Details: Category: Tungsten Information; Published on Friday, 17 July 2015 17:53; Written by xinyi; Hits: 385

Three topics are presented for discussion: Regarding the Edison lamp, the author presents several samples of what has been termed "Edison's X-ray lamp." This occasion is the first time that the lamp has been publicly exhibited. It is known that in connection with Mr. Edison's experiments with Roentgen rays, and in the construction of his fluoroscope, he experimented with thousands of chemical substances, and the substance which he found most suitable for use on the fluorescent screen was tungstate of calcium, which, together with barium platinum cyanide, constitute the substances most extensively employed in fluorescent screens. The author will operate one of the tubes that will serve to indicate to some extent the results of Mr. Edison's experiments in this direction. Regarding the Nernst lamp, the author presents tonight various types of American, English, German and Hungarian Nernst lamps, of both self-lighting and torch-lighting types. Some of the foreign types of lamps he described in detail in his article presented at the 151st general meeting of the INSTITUTE on Feb. 18, 1901; and the Westinghouse type of Nernst lamp has been presented by Alexander J. Wurts at the summer meeting of the INSTITUTE at the Pan-American Exposition at Buffalo. The author notes in passing the German Nernst lamps which are shown burning here this evening, and which are the latest types manufactured by the Allgemeine Electricitats Gesellschaft of Berlin. The large lamp containing the pendant conical heating coil is of a new type, which is here publicly presented for the first time. Finally, the author presents small quantities of radium being due to the interest which radium has excited in the scientific world, and as there are probably few in this audience to-night who have had an opportunity of seeing this remarkable, and up to the present time, exceedingly rare substance.

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Preparation of Tungstate Nanopowders by Sol-Gel Method

Details: Category: Tungsten Information; Published on Friday, 17 July 2015 17:57; Written by xinyi; Hits: 357

Tungstate crystals are considered high-class scintillators to be used as detector material for high-energy radiation. These crystals are frequently used as references in measurements on new luminescent materials. In this paper, we present manufacturing process of nanocrystalline tungstate materials. Lead tungstate (PbWO₄), cadmium tungstate (CdWO₄), calcium tungstate (CaWO₄), and zinc tungstate (ZnWO₄) were synthesized via modifying sol-gel process. An advantage of the developed technology is the possibility of manufacturing tungstate powders in nanocrystalline state not only at elevated temperatures but at room temperatures as well. X-ray diffraction method, scanning electron microscopy, and thermal investigations were done to establish structural and morphological state of these materials. For reaching the most dispersible with the lowest agglomeration single-phase system of tungstate materials, there was an established optimal relationship between the system of starting reagents and solvents.

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The Calcium‐Silicate‐Tungstate Phosphor： Phase Relationships and Fluorescent Properties

Details: Category: Tungsten Information; Published on Friday, 17 July 2015 17:42; Written by xinyi; Hits: 382

An efficient phosphor can be prepared by a co‐crystallization of $\text{[math]}$ and $\text{[math]}$ . The fluorescence, exicted by either 2537Aå or cathode radiation, is that of a mechanical mixture of $\text{[math]}$ and $\text{[math]}$ . In the presence of tungstic oxide, the formation of $\text{[math]}$ is greatly accelerated.

Determination of the pertinent compatibility tetrahedra in the system $\text{[math]}$ revealed that the phosphor compositions lie in the sub ‐ tetrahedron $\text{[math]}$ . X‐ray data showed that there was no solid solubility of $\text{[math]}$ in $\text{[math]}$ ; the fluorescence of $\text{[math]}$ is adversely affected by $\text{[math]}$ .

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