Found in "glow-in-the-dark" cockpit instrument dials and switches.

Often alloyed with magnesium (Mag-Thor) in engine parts and airframes to provide high-temperature strength and creep resistance.

Common in older insulation and electrical components, requiring abatement before the aircraft can be scrapped for metal recycling. 4. The Shift to "Clean" Replacements

Occasionally used as counterweights in control surfaces (like ailerons or tails) due to its high density. 2. Safety and Handling Protocols

Technicians must wear respirators and gloves when machining or sanding components that may contain thorium or depleted uranium to avoid inhaling radioactive dust.

When interacting with legacy aircraft at "boneyards" like , strict safety measures are mandatory:

The push to retire 201 aircraft in 2022 is part of a broader strategy to move toward newer platforms like the F-35 and the upcoming Next Generation Air Dominance (NGAD) fighter . These modern systems prioritize safer materials and sustainable fuels to reduce their future environmental and radioactive footprint.

Old fighter jets, particularly those from the 1950s through the 1980s, often contain specific radioactive elements used for their unique physical properties: