Which of the following contamination levels indicates a Non-contaminated Area?

A contamination level of 0 disintegrations per minute per 100 square centimeters (dpm/100 cm^2) clearly indicates a Non-contaminated Area. This means that there are no detectable radioactive particles in that specific area. Contamination levels are critical for maintaining safety protocols in environments where radioactive materials are present. When the dpm measurement is zero, it confirms that the area has been adequately controlled and poses no risk of exposure due to contamination.

In contrast, the other levels mentioned suggest varying degrees of contamination. Levels of 10-100 dpm/100 cm^2, 100-1,000 dpm/100 cm^2, and 1,000-10,000 dpm/100 cm^2 indicate the presence of radioactive materials, which would classify those areas as contaminated rather than non-contaminated. The significance of these measurements is paramount in radiological safety, as they help workers and safety officers determine the necessary precautions and actions required to mitigate any risks associated with exposure.