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Personal shielding against more energetic radiation such as gamma radiation is very difficult to achieve as the large mass of shielding material required to properly protect the entire body would make functional movement nearly impossible. For this, partial body shielding of radio-sensitive internal organs is the most viable protection strategy.
Lead shielding refers to the use of lead as a form of radiation protection to shield people or objects from radiation so as to reduce the effective dose. Lead can effectively attenuate certain kinds of radiation because of its high density and high atomic number ; principally, it is effective at stopping gamma rays and x-rays .
Electromagnetic shielding that blocks radio frequency (RF) electromagnetic radiation is also known as RF shielding. EMF shielding serves to minimize electromagnetic interference . The shielding can reduce the coupling of radio waves, electromagnetic fields, and electrostatic fields .
Faraday cage demonstration on volunteers in the Palais de la Découverte in Paris EMI shielding around an MRI machine room Faraday shield at a power plant in Heimbach, Germany. A Faraday cage or Faraday shield is an enclosure used to block some electromagnetic fields.
Depleted uranium is the best radiation shielding by weight, due to the high atomic weight of the uranium atoms; materials are more able to block radioactivity the higher their atomic weight, and uranium is one of the heaviest natural elements.
[citation needed] This shielding can be ensured by the use of lead (common) or materials such as concrete (very large walls are therefore required) or even tungsten. The amount of radioactivity present in the hot cell, the energy of the gamma photons emitted by the radioisotopes, and the number of neutrons that are formed by the material will ...
The trapped radiation was first mapped by Explorer 4, Pioneer 3, and Luna 1. The term Van Allen belts refers specifically to the radiation belts surrounding Earth; however, similar radiation belts have been discovered around other planets. The Sun does not support long-term radiation belts, as it lacks a stable, global dipole field.
Shielding: Air or skin can be sufficient to substantially attenuate alpha radiation, while sheet metal or plastic is often sufficient to stop beta radiation. Barriers of lead , concrete , or water are often used to give effective protection from more penetrating forms of ionizing radiation such as gamma rays and neutrons .
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