Gamma radiation in some degree exists in nanoparticles, which is a gamma energy of 6 MeV actually, and has wavelength at 0.2 pm or so, which is a few orders smaller than the gaps between the nanopowder particles.

The gamma rays coming from the nickel nanopowder should need multiple reflections refractions and absorption, so the energy will be converted to heat. Some proper gamma will produce hydrogen that is useful for the cold fusion. Gamma radiation coming from the nickel nanopowder is much closer to the cylindrical enclosure. In this way, the radiation will be much stronger. 

Therefore, there is a need for radiation protection, for tungsten alloy material, with composition of 90%W to 97%W is usually used for tungsten alloy protection for gamma radiation in nanoparticles. It really a suitable material for radiation protection for its high density with high denser properties, and it is really excellent for radiation absorption. 

 

 

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