Bioassays are analyzing samples of fecal material/ urine.

• A. dosimetry
• B. bioassays- analyzing samples of fecal material/ urine
• C. whole body counters
• D. air sampling

Answer: (B)

Bioassay focuses on detecting and measuring radioactive material inside the body by analyzing biological samples such as urine and feces. These excreta carry the internalized radionuclides, so testing them helps estimate how much material was taken in and what dose the body may have received.

Other options describe different parts of radiation monitoring. Dosimetry is about estimating the dose from exposure, often external, rather than what’s inside the body. Whole body counters measure the radioactivity present in the body from the outside. Air sampling checks for radioactive material in the environment to assess inhalation risk, not the internal contamination detected through excreta.

So the choice describing analysis of fecal material and urine is the one that matches the purpose and method of bioassays.