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Can a Faraday cage protect against radiation?

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That depends on the radiation. A Faraday cage works only on electromagnetic radiation below some limiting frequency. Alpha and beta radiation are probably blocked before ever getting to the cage. read more

A Faraday cage is a start for protection against electromagnetic inteference, including EMP. For passive devices, a Faraday cage should be sufficient, if properly designed. However for active devices, one also has to worry about protecting input/outputs given the wires can act as antennas coupling electromagnetic radiation. read more

Imagine you have a cage that provides just 3 dB of shielding. If you put that cage inside another cage, you have 6 dB. And so it continues. This is one case where sufficient isolation is indeed possible (assuming you are far enough from the blast that the shield isn't mechanically compromised). read more

A Faraday cage or Faraday shield is an enclosure used to block electromagnetic fields. A Faraday shield may be formed by a continuous covering of conductive material or in the case of a Faraday cage, by a mesh of such materials. Faraday cages are named after the English scientist Michael Faraday, who invented them in 1836. read more

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