Which of the following statements best describes `Background Radiation' –
Background Radiation refers to radiation exposure received from natural sources such as extraterrestrial cosmic rays, terrestrial sources and from radionucleotides present within the body. Background radiation is ubiquitously distributed and received constantly.
Radiation in the background of nuclear reactors
Radiation in the backgroung during radiological investigations
Radiation present constantly from natural sources
Radiation from nuclear fall out