Final answer:
Secondary barriers are used for shielding against electromagnetic radiation, especially gamma rays and X-rays. Magnetic fields can deflect charged particles and can be used to shield oneself from ionizing radiation from natural sources.
Step-by-step explanation:
Secondary barriers provide shielding from electromagnetic radiation. Electromagnetic radiation can be in the form of gamma rays or X-rays, which are highly penetrating and can pass through most materials. Dense materials with high atomic numbers, like lead, are commonly used to provide effective shielding against this type of radiation. To shield oneself from high-velocity charged particles—which can damage biological cells—you could use a magnetic field. A magnetic field has the ability to deflect charged particles, thereby minimizing exposure to ionizing radiation that we commonly receive from natural sources such as cosmic rays, radon gas, and other radioactive materials present in our environment.
It's important to understand that while some material barriers are able to stop particulate radiation like alpha and beta particles, they are not as effective against electromagnetic radiation. Blocking or shielding the radiation, moving farther away from the source, and limiting the time of exposure are strategies to minimize the health risks associated with radiation exposure.