Tungsten Shielding for Gamma Radiation

Effective shielding such as tungsten shielding of gamma radiation is in most cases based on use of materials with two following material properties: high-density and high atomic number.

However, low-density material such as lead can be compensated with increased thickness, which is as significant as density and atomic number in shielding applications. Yes, lead is also widely used as a gamma shield, however, if the density is much lower than the tungsten shielding material. Besides, depleted uranium could also be used for gamma radiation shield, but it is not environmental friendly. Considering with those factors, tungsten shielding is suitable for gamma radiation shielding. Especially for the gamma radiation, which is much more complex than the alpha and beta radiation shielding, in order to find a way to shield it, high density must be the most important thing, while tungsten have the high density almost to 18.6g/cm3, which is similar to gold. Therefore, tungsten shielding for gamma radiation is more and more popular. 

For more details, you could visit tungsten shielding. 

Tungsten Alloy Shielding for Gamma Radiation

Gamma rays emitted from the nickel nanopowder that is closer to the cylindrical enclosure will be stronger. From the publicly released information by Focardi and Rossi it is known that a small gamma radiation exists. For this purpose the E-cat described in the Rossi patent contains a lead jacket. For the E-cat HT reactors that were tested by G. Levi et al., however, a lead jacket was not noticed. This does not mean that there is not any radiation shield. With the advancement of nanotechnology a new way of effective gamma radiation shield is developed. This has been in focus of NASA research for years.
Tungsten alloy material is suitable for gamma radiation protection, for more details, you could visit http://www.tungsten-alloy.com/tungsten-alloy-radiation-shielding.html.

Gamma Radiation from the Nickel Nanopowder

For gamma energy in the order of 6 MeV, the wavelength is about 0.2 pm. This wavelength is a few orders smaller than the gaps between the nanopowder particles. The gas occupying the gaps has a refractive index close to one, while the refractive index of the nanoparticle material for the wavelength of 0.2 pm is much higher. Then the emitted gamma rays from the nickel nanopowder in the bulk will undergo multiple reflections, refractions and absorption, so the energy they loose will be converted to heat. Some proper attenuated gamma rays will produce Rydberg hydrogen that is useful for the cold fusion. Only not absorbed attenuated gamma rays may escape the fuel powder, so they must be shielded.
Tungsten alloy material is suitable for gamma radiation protection, for more details, you could visit http://www.tungsten-alloy.com/tungsten-alloy-radiation-shielding.html.