What is the annual effective dose limit in millisievert (mSv) for a radiography student who is less than 18-years-old?

• A. 0.1 mSv.
• B. 0.5 mSv.
• C. 5 mSv.
• D. 1 mSv.

Answer: (D)

Minors in radiography training have a strict annual effective dose limit to protect developing tissues. For a student under 18, that limit is 1 mSv per year. The effective dose combines all exposure to the whole body and accounts for how different tissues respond to radiation, so regulators set this cap to minimize lifetime cancer risk. Keeping within this limit is part of applying ALARA—continue to minimize exposure through proper technique, shielding, and reducing time. Therefore, the maximum permissible annual dose for an under-18 radiography student is 1 mSv.