ASNT Industrial Radiography Radiation Safety Practice Test

What is the allowed exposure limit for a shipping container at a distance of 1 meter?

1. Less than 0.5 mR/h

2. 1 mR/h

3. 2000 µSv/h

4. 500 mR/h

The correct answer is: 2000 µSv/h

The allowed exposure limit for a shipping container at a distance of 1 meter is typically expressed in terms of either millirems per hour (mR/h) or microsieverts per hour (µSv/h). The correct answer, which states 2000 µSv/h, translates to 2 mR/h when converted (considering the conversion factor of 1 mR = 100 µSv). Understanding dose limits is crucial for maintaining safety in radiographic operations. Regulatory agencies establish these limits to ensure that radiation exposure remains within safe parameters for workers and the public. While other values might be present as options, they do not align with the historically accepted safety standards for radiation levels around potentially radioactive materials, especially in shipping contexts. In summary, the proper exposure limit reflects a balance between operational needs and safety considerations, ensuring protection against harmful radiation levels.