What does a surface radiation limit of less than 0.5 mr/hr indicate for a White I package?

A surface radiation limit of less than 0.5 mR/hr for a White I package indicates that the radiation levels are low enough to be considered safe for unrestricted transport. In the classification of radioactive material packages, White I packages are designed for materials that pose minimal radiation hazards.

This specific threshold of 0.5 mR/hr signifies that the radiation exposure from the package at its surface is not significant enough to warrant special precautions during transport, making it suitable for handling without specific restrictions.

Higher radiation limits would necessitate stricter handling and transport requirements due to increased safety concerns, but at this level, the guidelines established by regulatory bodies allow for open transportation and handling.