What is the normal range of Roentgen exposure in DC?

The normal range of Roentgen exposure in a controlled environment, such as in Washington, D.C., is considered to fall between 5 and 20 micro Roentgen. This range is significant because it reflects a level of gamma and X-ray radiation exposure that is generally considered safe and typical for the environment.

In assessing radiation exposure, particularly in urban areas, understanding the normal exposure levels is crucial for both public health and safety. This range indicates the baseline levels of background radiation from natural and artificial sources that individuals may be exposed to during their daily activities in that area. Any measurement significantly above this range might warrant further investigation to ensure that safety regulations are adhered to and that there is no increased risk to the population.

The other ranges provided in the choices extend beyond this established normal range, which might indicate higher levels of exposure that could potentially pose health risks or reflect unusual environmental conditions. Therefore, the choice indicating a range of 5-20 micro Roentgen accurately captures the typical exposure levels while ensuring public awareness and safety.