Structural of lead is poor, and not resistant to high temperature. When lead used to manufacture container, screen activity, lead bricks, it is necessary to use the steel to make skeleton structure, otherwise, it will collapse of its own weight.
The atoms coefficient of tungsten is 74, which is one of natural high density elemental metal. Tungsten and lead production are applied to the shield member, but density of lead is smaller than tungsten (the density of lead is 11.34g/cm3, tungsten density 19.25g/cm3), shielding performance is worse than that of tungsten, besides, lead is toxic, it harms the environment and human health, so tungsten shield gradually replace lead shielding, the best choice of the shield.
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