The housing of the x-ray tube must confine radiation leakage to less than how many mR per hour?

The correct answer indicates that the housing of the x-ray tube must confine radiation leakage to less than a specified value over an hour, which is typically set at 100 mR (or a similar limit depending on regulations). This is an important safety feature designed to protect both patients and medical staff from unnecessary exposure to ionizing radiation.

If the housing allows for higher levels of leakage radiation, it could pose a significant health risk over time, leading to potential radiation sickness or an increased risk of cancer for those exposed. Therefore, adhering to this limit ensures that x-ray equipment is within safety standards, minimizing any risks associated with radiation exposure during routine medical procedures.

Options that suggest timeframes like seconds or minutes may not provide a comprehensive overview of occupational exposure in a clinical setting, while a daily limit might be too lenient given the cumulative effect of radiation exposure over time. The emphasis on an hourly limit aligns with radiation safety protocols that emphasize continuous monitoring and limitation of exposure intervals.