Neutron radiation protection relies on radiation shielding. Thin shields also have internal reflections that reduce the shielding effectiveness. Protective shielding and drugs may lower risks to an acceptable level. Another example of the practical use of electromagnetic shielding would be defense applications. Different types of ionizing radiation interact in different ways with shielding material. This necessitated adding extra shielding and insulation to wiring and other components. The entire reactor, including the radiation shielding, weighed . Bonding electrons can also lead to shielding and deshielding effects. This flux vaporises during welding and produces a plume of shielding gas. Lead is the main material used for radiographic shielding against scattered X-rays. Helium is also substantially more expensive than other shielding gases. Some people claim that aluminum shielding, essentially creating a Faraday cage, does work. This is the basis for the electric field shielding action of a Faraday cage. A gas hose from the tanks of shielding gas supplies the gas to the nozzle. Special TEMPEST shielding can mitigate this effect.