A high radiation area boundary needs to be posted at an area where no one could receive a dose of more than _____________ in any one hour?

A high radiation area is defined by safety regulations as a location where individuals could receive a dose greater than a certain threshold within a specific period of time. In this context, the threshold for classifying an area as a high radiation area is that an individual could receive more than 100 millirem (mrem) in one hour. This standard is designed to protect individuals from significant exposure to radiation, as doses above this amount could potentially lead to health risks.

Thus, if a boundary is established and posted, it signifies that precautions should be taken because the potential for receiving doses exceeding this limit exists in that location. This classification helps ensure that workers and the public are informed and can take appropriate measures to minimize their exposure.

In comparison, the lower values indicated in the other choices (2 mrem, 5 mrem, and 5 mR/hr) do not meet the regulatory definition needed for a high radiation area. Therefore, the correct answer effectively reflects the safety criteria used in radiation safety protocols.