Tungsten Shielding Blanket

Traditionally, lead has been the product of choice for radiation shielding. Tungsten shielding blanket has the ability to field-fit, providing for attenuation of radiation totaling from 5 to 10 person-Rem/years than provided by the equivalent weight of traditional lead blanket. And since tungsten is thinner and weighs as much as 50 percent less than lead, it may be more forgiving when workers are performing the physical activities required in a nuclear power plant.

The density of tungsten shielding blanket is similar thickness than lead blankets. And highly flexible and can be molded/formed into any shape. It often competitively priced to lead alternatives. It will engineer and fabricate specialized profiles, slabs and ribbon, including lockable "High Rad" applications.

Here, the method described above has an effect of preventing direct reaction of Ti and WF.sub.6 when an adhesion layer is a laminated layer of Ti/TiN films and a tungsten shielding blanket is formed on the adhesion layer. A direct reaction of Ti and WF.sub.6 will form a solid substrate which will exhibit a volume expansion and become a cause of peeling-off of a layer.

When an adhesion layer for forming a tungsten shielding blanket is formed by sputtering, the substrate is often fixed on a mount using a holder or hooks. At portions under these hooks, a SiO.sub.2 film which is an inter-layer insulating layer is exposed because almost no film is formed under the hooks by sputtering. When a tungsten shielding blanket grows on the exposed SiO.sub.2, the tungsten shielding blanket is easily peeled off because of weak adhesion anti particles are produced.


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