Ammonium Paratungstate as Other Tungsten Precursor

Tungsten oxides (for example, WO2 and WO3, respectively known as blue and yellow tungsten oxide) is a naturally occurring material used in the manufacture of tungsten. Significantly for the purposes of the present invention, tungsten oxide has lower density and less electrical conductivity than pure tungsten metal. These properties present distinct improvements in the X-ray and gamma ray source shielding area, in which electrical conductivity is a disadvantage. Ammonium paratungstate and ammonium metatungstate (respectively 5(NH4)2O.12WO3.5H2O and 3(NH4)2O.12WO3.XH2O) may also be advantageously employed, as may a range of other tungsten precursors. Ammonium paratungstate has a WO3 content of 88.5%, the WO3 of ammonium metatungstate obviously depends upon the water content. In the case of the ammonium tungstate precursors, removal of the ammonia groups generates WO3, and this same process may be used with other tungsten precursors, or the additional groups may be used in the composite.

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