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By then painting the walls with metal nano powder-based
paint for electromagnetic shielding, you can achieve an even greater reduction
in radiation in a space, which is usually desirable when there is a nearby
source (for example, at a distance of less than 200 m). The paint can also be
used on the floor. These paints provide high radiation attenuation rates - even
for very high frequency radiation - and also shield from low frequency electric
elds (e.g., from wires, electrical appliances, etc.), but unfortunately not
from magnetic ones at 50 Hz.
On walls that have not yet been plastered or on non-laid floors,
it is possible to insert a special stainless-steel mesh. Since this mesh is
made of stainless steel, it can be easily used outside (for example by nailing
it on the outside walls); while the electromagnetic shielding fabric that reflects
the wireless radiation can be placed under the sofa or bed, when the radiation
source is of lower power (e.g., the neighbor's Wi-Fi modem).
A practical solution for bedrooms is to use screened bed
canopies, which are very similar to mosquito nets (but usually much more
expensive). They prevent the penetration of radiation from all directions
except from the bottom of the bed (but you can put a metal fabric or other
shielding material there). With such screens, you get minimal sleep disturbance
from current and future wireless radiation sources and take a daily break from electromagnetic
pollution. The mesh of the network must be about 1/100 of the wavelength of the
radiation to be shielded, or less. In general, a mesh of about 1 mm is sufficient.
The actual attenuation of the radiation depends on the reflection
provided by each material but also on the surface coverage. Any unshielded
point is a potential penetration point which can reduce the local or overall
result of the shield design. The use of major shielding materials that provide
20-40 dB shielding (paints, window films, curtains, canopies and lightweight
nets) in more than 50% of the surfaces of the areas intended to be protected usually
means a practical reduction of radiation values greater than 90%.
For shielding with higher efficiencies, greater than 99% -
which are usually desired when recording RF field values greater than 10,000 μW
/ m – we recommend the use of materials that provide attenuation greater than
50 dB (paper from special wallpaper, window curtains and bed canopies) or a combination
of materials (e.g., curtain and window film), and greater emphasis on
prevention in unshielded openings, starting with windows.
For shielding from external sources of radiation, maximum
reduction is achieved by shielding windows, walls and roofs facing the source.
By shielding the other sides of space, we also reduce the penetration of
radiation through reflections.
Furthermore, the shielding of all parts of an environment
constitutes a preventive measure of protection against the possibility of the
future presence of new external sources of radiation. Obviously, we should
NEVER use the mobile phone in the shielded environment, because it would release
emissions at a much higher power than normal, with the relative waves that
would remain trapped in the room.
To ensure that your smartphone or any other device does not
emit any EMF radiations, you can put an EMF blocker like Smartdot on them.
Smartdot is a magnetic DOT that can be stuck on all devices to reduce everyday
harmful magnetic radiation. To know more about smart dot emf device,
read this comprehensive review.
References
1. https://en.wikipedia.org/wiki/Electromagnetic_shielding
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