calcium tungstate

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Related to scheelite: tungsten

cal·ci·um tung·state

a phosphor with a high stopping power for x-rays that was formerly used widely in fluoroscopic screens and intensifying screens for radiography.

calcium tungstate

CaWO4, a fluorescent material formerly used for radiologic imaging. It was used in intensifying screens to amplify the image, thereby reducing the radiation exposure to the patient.
See also: calcium
References in periodicals archive ?
King Island Scheelite executive chairman Johann Jacobs said:
The heavy mineral concentrates mainly consist of Fe-Ti oxides--rutile and ilmenite, widespread cassiterite, wolframite and scheelite. Less common is zircon, monazite with xenotime inclusions, and iron oxides/ hydroxides.
The deposits contain mainly scheelite mineral, which occurs predominantly in quartz rich metasedimentary rocks (Leake et al,.
Till samples that contain the highest W contents in the <0.063 mm fraction at the Sisson deposit also contain up to 150,000 scheelite grains/10 kg in the pan concentrate fraction (Appendix A), with most grains between 25 and 200 pm in size (McClenaghan et al.
850586 [9], they were specified as primitive tetragonal scheelite structured SrMo[O.sub.4] [1-3, 5].
All the peaks including the minor ones are indexed for a perfect tetragonal scheelite with space group 141/a.
CMOC intends to issue not more than 542 million ordinary shares to raise approximately RMB3,646 million which will be invested in four projects, including the "clean and efficient resource integrated utilisation and construction project with an annual processing capacity of 42,000 tonnes of low-grade and complex scheelite ores", the "ammonium molybdate production line project with an annual production capacity of 10,000 tonnes", the "high-performance cemented carbide project" and the "tungsten metal products and tungsten alloy material downstream processing project".
The initial results of the current metallurgical test-work programme have indicated that a coarser crushed product size of -5 million will achieve liberation of the scheelite, further simplifying the process plant flow-sheet and resulting in cost savings.
Especially since World War II, the pegmatites of the state of Minas Gerais have yielded some of the world's finest specimens of topaz, chrysoberyl, euclase, elbaite, and beryl (in all of its colored varieties); phosphate-rich pegmatites of the same state have furnished the world's finest specimens of brazilianite, beryllonite, eosphorite, hydroxylherderite, amblygonite and more; complex pegmatites of other kinds have provided cassiterite, xenotime, monazite and several rare-earth species; Brazilian specimens of titanite, phenakite, fluorapatite, kyanite, scheelite, spessartine and bertrandite are among the world's very best.
Up to the end of the 1919-20 fiscal year, this guaranteed purchase by Britain allowed New Zealand to sell beef, mutton, lamb and other meats worth around 7 percent of total GNP, (31) along with cheese, wool and scheelite. (32) These returns masked the fact that New Zealand was, by and large, selling one product--pastoral--into a single market.
Scheelite calcium tungstate is well known for their interesting luminescence and structural particularities and therefore has been extensively studied during the past century.