Originally Posted by justanoldmuso
... apparently also aluminium foil can be used to block radiation
per the net...but not had time to test.
Aluminium/aluminum foil is on of the standard materials for investigating how to reduce EMI/EMF to and from equipment. It's effective provided it has suitable contacts to ground/chassis and does not have gaps/leaks that are a significant part of a radio wavelength long and it does not form a "patch antenna" by having a significant area sticking out into free air.

The other favourite material, very often in combination with the foil, is self-adhesive copper foil. Copper foil tape

People can get a bit paranoid about EMI/EMF. Most of us aren't normally affected by it, though a few are sensitive, often through metalic tooth fillings or caps. People get alarmed by mobile 'phone masts, but they're high up and very directional so the radiation is small. But when they're close, your 'phone turns down its transmit power. If the mast is a long way away, the 'phone has to turn its power up. Your 'phone is very close to you.

Jazz relative beginner, starting at a much older age than was helpful.
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