Radiological contaminants are primarily derived from what sources?

Radiological contaminants originate primarily from both natural and man-made sources of radiation. Natural sources include cosmic rays from outer space, radon gas emitted from the earth, and certain radioactive minerals found in soil and rock. Man-made sources consist of radiation produced from medical procedures, nuclear power plants, and other industrial processes that involve radioactive materials.

This distinction is vital because it highlights the diverse origins of radiological contaminants. Understanding these sources is crucial for water operators who must monitor and manage water quality to ensure it meets safety standards. The other options, while relevant to different types of contaminants, do not apply to the classification of radiological contaminants specifically, as they pertain more to organic chemicals and heavy metals typically found in agricultural runoff or industrial waste.