Which area does the Radiation Safety Officer evaluate?

• A. External dosimetry.
• B. Internal Dosimetry.
• C. Radiation shielding design.
• D. Environmental monitoring.

Answer: (B)

The main idea here is that protecting workers from internal contamination requires estimating the dose from radionuclides that have entered the body. Internal dosimetry deals with exposures from inhaled, ingested, or wound-contaminating materials, and it uses bioassays (like urine, fecal samples, or whole-body counts) along with biokinetic models to estimate how much activity has been taken into the body and what the committed dose will be over time. This is essential because internal exposures can contribute to risk even when external radiation levels are well controlled, and regulatory limits are based on these internal dose estimates. The Radiation Safety Officer oversees this process to ensure accurate intake assessments, proper recordkeeping, and appropriate protective actions.

External dosimetry, shielding design, and environmental monitoring are also important parts of radiation safety, but the question focuses on the area concerned with doses from inside the body, which is internal dosimetry.