A top-of-the-line tungsten alloy fake gold rod should match the color, surface hardness, density, chemical, and nuclear properties of gold perfectly.

 To do this, you could start with a tungsten slug about 1/8-inch smaller in each dimension than the tungste fake gold rod you want, then cast a 1/16-inch layer of real pure gold all around tungsten fake gold rod.

This is would feel right in the hand, it would have a dead ring when knocked as gold should, the product would test right chemically, it would weigh exactly the right amount, and though I don't know this for sure, I think tungsten alloy fake gold rod would also pass an x-ray fluorescence scan, the 1/16" layer of pure gold being enough to stop the x-rays from reaching any tungsten. You'd pretty much have to drill it to find out it is fake.


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Detecting a high-quality tungsten alloy fake gold bar would be extremely difficult. It would likely require significant and material alterations to the bar being tested and this would negatively affect the marketability if its hallmark veracity were vindicated. Some applications require the tungsten to be fake gold. The main reasons for tungsten fake gold bar are to protect the wire from corrosion or to solder it to other metals.

Besides, tungsten alloy products could also made as tungsten alloy fake gold bar which posses a better electric conductivity, and contribute greatly to the world industry development. Also tungsten fake gold saves the energy and poses no pollution threat to the environment and thus to achieve a sustainable development.


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The conventional material of medical shielding is lead, atomic number of lead is 82, lead has good energy absorption characteristics, and it is an ideal material for shielding high-energy ionizing radiation. Looking from the particle absorption characteristics, and the lead has good absorption capacity to ionizing radiation which energy is higher 88.0keV and between 13.0keV and 40keV, but  for energy between 40keV to 88.0keV, there is a weak absorption zone.

Tungsten alloy shield is a new shield, and in the case of the same thickness as the lead shield, the effect of tungsten alloy shielding effect is better. And tungsten alloy shield is environmentally friendly, harmless to humans and nature, but lead is toxic, and the source of pollution, so tungsten alloy shield gradually replace lead as the most popular shield.


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Principles of selecting the shielding material for shielding box are:

1. if the external magnetic interference is too high, the attenuation shield will be reduced. This is because when the external magnetic field is too high, the magnetic material will be close to magnetic saturation.

2. In the usual case, using the thickness metallic material to produce the shield case is not realistic, because of its high cost.

3. To make the maximum attenuation of the external magnetic field, it is need to use a high permeability (μ) of the material.

4. The magnetic shield effect is the material thickness of the cover shield diameter (at the time of its diagonal rectangular shield) the ratio (t / D) function of shielding.

Based on the above principles of selection, high density tungsten alloy shielding box is the best choice for shielding materials.

 

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Shielding effect of the shielding case is measured by magnetic field intensity attenuation degree of device or component after shielding. After shielding, the magnetic field intensity attenuation rate is the functions of materials’ permeability, thickness and size of the shield function. High magnetic permeability material’s price is higher than the low magnetic permeability material, but if the shielding effect of the single layer of high magnetic permeability material and a multilayer material of low magnetic permeability are the same, then you could choose the thin material of high magnetic permeability, which will be more economical. Tungsten alloy shielding box, lead shielding box are widely used, but the effect of tungsten alloy shielding case is better than lead shielding case, although the thickness of tungsten alloy shielding case is thinner than lead shielding case.

 

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The Materials for shield includes high density tungsten alloy, lead, iron, etc, depending on the different field and application to select a different shield material.

If the shield has budget control, then you could choose lead as the material of the shield, but if the shield is the point of application which needs limited space, so you need to choose tungsten alloy shield which is thin, and has good shielding performance. For very low frequency electromagnetic field changes (such as frequency 50Hz), you have to use a ferromagnetic material to shield, like shielded power transformer, you can choose iron to shield which has good magnetic permeability.


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As can be seen from the chart, although the thickness ratio of the tungsten shield is smaller than lead shielding, the attenuation multiples of tungsten shield is higher, so we can obtain that tungsten shield is better.

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High purity tungsten is soft texture, the project is usually mixed with Ni, C and other elements to replace pure tungsten, tungsten alloy is heavy alloy, it inherits the characteristics of good tungsten, enhances its hardness, and maintains a good shape. The following table lists the attenuation coefficient of tungsten nickel and lead to different energy photons.

As can be seen from the graph, the attenuation of the different photon energy is 10 times, the thickness of the tungsten alloy is smaller than lead shielding.

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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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As it can be seen from the following chart, the performance of tungsten shielding is much larger than the lead. As far as research, shielding properties of materials are closely linked with the density, the greater the density, the better the shielding properties of the material. From the above chart we can see that the density of tungsten is 1.5 times denser of lead, so shielding properties of tungsten is better. Moreover, lead is toxic and potentially mixing hazardous waste, it is harmful to the environment.





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