Which term describes biological samples used to assess internal contamination?

Which term describes biological samples used to assess internal contamination?

• A. external radiation surveys
• B. air sampling
• C. dosimetry
• D. biological- samples of fecal material/ urine

Answer: (D)

Assessing internal contamination comes from what your body excretes after uptake. When radioactive materials enter the body, they are distributed and eventually leave via excreta, so analyzing biological samples such as urine or feces directly reveals the presence and amount of internal contamination. This approach is called a bioassay, and measuring radionuclide activity in those samples helps estimate the committed dose and track changes over time. In contrast, external radiation surveys assess radiation on the skin or surroundings, air sampling looks at contaminants in the environment, and dosimetry estimates dose from external exposure using devices like dosimeters.

Assessing internal contamination comes from what your body excretes after uptake. When radioactive materials enter the body, they are distributed and eventually leave via excreta, so analyzing biological samples such as urine or feces directly reveals the presence and amount of internal contamination. This approach is called a bioassay, and measuring radionuclide activity in those samples helps estimate the committed dose and track changes over time. In contrast, external radiation surveys assess radiation on the skin or surroundings, air sampling looks at contaminants in the environment, and dosimetry estimates dose from external exposure using devices like dosimeters.