Which of the following is a component of natural background radiation?

Terrestrial radiation is indeed a component of natural background radiation. This type of radiation originates from both the earth's crust and the materials that make up the planet, including rocks and soil. These materials emit radiation as a result of the decay of naturally occurring radioactive isotopes, such as uranium, thorium, and radon.

Natural background radiation collectively includes terrestrial radiation, cosmic radiation from outer space, and internal radiation from radioactive isotopes present within the human body. Terrestrial radiation contributes significantly to the overall exposure individuals receive from natural sources.

In this context, man-made radiation, medical radiation, and industrial radiation are not components of natural background radiation. Man-made radiation arises from artificial sources such as medical procedures, industrial processes, and nuclear power, while medical radiation specifically refers to radiation exposure from diagnostic imaging and treatments in healthcare. Industrial radiation involves radiation used in various industrial applications and does not fall under the category of natural background radiation.