Coatings radium

Radium-behiUter, m. radium container, radiode. -belag, m. radium coating, -erz, n. radium ore. -jodid, n. radium iodide. -saJz, n. radium salt, -strahlen, m.pl. radium rays. 

Early work was based on concentrating the radium from the seawater sample by adding barium and coprecipitating with barium sulfate. This concentration procedure has been replaced by one involving the extraction of radium from seawater on acrylic fibre coated with manganese dioxide [19,20] (Mn fibres). By use of this technique, volumes of 200-2000 litres may be sampled routinely. 

Radon can be isolated from radium by several methods. An aqueous solution of radium salt such as radium bromide is heated, liberating radon. Radioactive bombardment then decomposes water to oxygen and hydrogen. Radon is separated from the gaseous mixture by condensation in tiny tubes placed in liquid air. The tubes then are sealed by melting. A gold or platinum coating is applied to form the radon seeds used in radiation therapy. 

Gas chromatographic equipment was an electron capture gas-liquid chromatograph. Conditions should be as follows Class column, 6 x 4 mm. i.d., packed with 80/90 mesh Anachrom ABS coated with 10% DC 200 (12,500 cst) column temperature, 195°C. injection temperature, 220°C. carrier gas flow, 75 ml./min. of nitrogen electron capture detector, radium source, concentric type. The complete system is adjusted so that 1 nanogram of lindane produces approximately 50% scale. 

Manganese Dioxide Coated Filters for Removing Radium from Drinking Water... 

His equipment was similar to Marsden s, a small brass box fitted with stopcocks to admit and evacuate gases from its interior, with a scintillation screen mounted on one end. For an alpha source he used a beveled brass disk coated with a radium compound ... 

In 1903, Rutherford and his young wife visited Pierre and Marie Curie in Paris on the very day that Madame Curie received her doctorate in physics. That evening, during a party in the garden of the Curies home, Pierre Curie brought out a tube coated with a phosphor and containing a large quantity of radioactive radium in solution. 

The nature of the experiment is indicated by the drawing in Figure 3-11. A piece of radium emits alpha particles in all directions. A narrow hole in a lead block defines a beam of the alpha particles. This beam of alpha particles then passes through the metal foil, and the directions in which the alpha particles continue to move are observed. The direction in which an alpha particle moves can be detected by use of a screen coated with zinc sulfide. When an alpha particle strikes the screen a flash of light is sent out. 

The bulk of the adventure stories took a far more serious approach. In Strange Adventures 50 Quly 1955) a visitor from outer space— Radium Man—steals a massive amount of American radium but has to leave it behind because it affected the space-drive mechanism of his rocket ship. In Showcase 23 (1960), Green Lantern stops an invisible villain from detonating an atomic bomb. Four years later, the Flash (May 1964) drew on his super speed to keep a nuclear bomb from obliterating a city. In 1965, Superman s hands became coated with invisible chemicals so that one clap would trigger an atomic explosion. In Adventure Comics 442 (December 1975), Aquaman barely stopped a... 

The heaviest member of the alkaline earth metals is radium (Ra), a naturally radioactive element discovered by Pierre and Marie Cnrie in 1898. Radinm was initially isolated from the nraninm ore pitchblende, in which it is present as approximately 1.0 g per 7.0 metric tons of pitchblende. How many atoms of radinm can be isolated from 1.75 X 10 g pitchblende (1 metric ton = 1000 kg) One of the early uses of radium was as an additive to paint so that watch dials coated with this paint wonld glow in the dark. The longest-lived isotope of radinm has a half-life of 1.60 X 10 years. If an antique watch, manufactured in 1925, contains 15.0 mg radinm, how many atoms of radinm will remain in 2025 ... 

Eldorado made a deal with U.S. Radium to market some of that firm s products in the Commonwealth. One of these was Undark, a radium-based luminous compound. The arrangement also encompassed compounds used in the manufacture of television and cathode-ray tubes. The biggest seller amor these products was the lonotron, a radioactive anti-static device that used the ability of alpha radiation to ionize air to prevent formation of static electricity. It was employed in industries where flammable vapours or materials could be ignited by sparks from static electricity. Textile and paper mills were major customers, but the lonotron helped in the operation of coating and packaging equipment as well. It enabled manufacturers to increase the speed of their machines while reducing the risk of fire. 

At the centre of the lonotron was a piece of metal foil that was impregnated with radium and then coated to trap emissions of radon gas. The foil was mounted in an aluminum housing, which provided shielding and directed the radiation. The lonotron could be fabricated in different sizes but was usually long and narrow. In a typical installation it would bridge the width of a conveyer belt at a distance from one to three inches over the moving material. Tariffs had a significant impact on how Eldorado structured its lonotron deal with U.S. Radium. After some discussions, customs allowed Eldorado to ship radium to the United States duty-free if it were destined to return to Canada as part of an lonotron. Still, Eldorado had to partially assemble the device to evade a Canadian tariff on a fully assembled product. ... 

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