Real-life radiation shielding mainly concerns huge slabs of lead and the radiation itself is understood as harmful electromagnetic energy emitted by uranium and other radioactive materials. This trope covers all instances where:
- Realistic radiation is shielded by fantastic means;
- Fantastic radiation (such as The Government's Mind Control rays) is shielded by mundane means (the classic Tinfoil Hat);
- Fantastic radiation is shielded by fantastic means.
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- In The Physics of Superheroes, James Kakalios explains how a helmet made of lead really could block attempts at mind reading, provided it's done by trying to pick up electric pulses in the brain.
- In past ages of comic books, Kryptonite radiation was stopped by lead, and only lead, even though while lead provides great radiation shielding in real life, it's by far not unique in this property.
- In X2: X-Men United, Magneto's helmet protects him from both the guy mind-controlling Xavier and the latter's psychic powers.
- In The Salvation War, demonic mind control and illusion powers can be blocked by foil, the story gets much mileage out of this, including the line "There will always be eccentrics who deny that the tin foil hat is absolutely essential to prevent baldricks taking over your mind." said by a government official.
- Aluminium foil is far from the only method of achieving this effect, however; it's just the most lightweight and convenient material available for the task on short notice.
- In The Alloy of Law, aluminum and some of its alloys are "allomantically inert", which means, in part that wearing a hat lined with aluminum foil will prevent an Allomancer from using Emotion Control powers on you.
- In The Beacon To Elsewhere by James H. Schmitz, radiation suits are used which protect the user by means of force fields. The protagonist has an advanced version which generates the force field without the need for a suit.
Live Action TV
- In an episode of The Finder the Finder wears an aluminum foil hat. The Client Of The Week (Hodgins from Bones) mocks him, but it really does help block the government from interfering with your brain waves so you can move.
- In the second ever Doctor Who story, "The Daleks", the Doctor and his companions take medicine that not only cure them of radiation sickness encountered while unknowingly exploring an irradiated planet, but also protects them from future radiation.
- The Tec-Shield Batman action figure wears a golden suit that "'protects' against extreme heat and chemicals".
- In the Mass Effect franchise, it's possible to block the mechanism for Reaper indoctrination ( and Leviathan enthrallment, which is quite similar) with sufficient numbers of glowy energy barriers. This is handy for studying fragments of Reapers and other small artifacts, which could otherwise slowly indoctrinate researchers to the Reaper cause. However, it's insufficient for really big things, like active Reapers and capital ship derelicts.
- Karl in FreakAngels wears one so the other "angels" don't bother him with telepathic messages all the time.
- In The Order of the Stick, Belkar uses a lead sheet to block Miko's Detect Evil ability. Later in the story, La Résistance of the Azure City use the same to hide from goblins' Detect Good. This is actually taken straight from the game the comic is based on, where (at least up to third edition) varying thicknesses of different materials will in fact block low-level Detect spells.
- Given an epic Call Back in the "Girard's Gate" storyline, when it turns out that the eponymous Gate itself is hidden behind lead sheeting, inside a pillar labelled "Your Gate Is In Another Pyramid".
- In the Futurama movie Into the Wild Green Yonder, Fry and the Legion of Madfellows wear foil hats which prevent their thoughts being read by "The Dark One". And to keep themselves fairly sane as it blocks their own uncontrollable telepathy.