The determination of the kind, quantity or concentration and location of radioactive material in the human body is called?

• A. Bioassay
• B. Dosimetry
• C. Radiography
• D. Calorimetry

Answer: (A)

Bioassay is the process used to determine the kind, quantity or concentration and location of radioactive material in the body. It involves analyzing body fluids such as urine or feces, and sometimes performing in-vivo measurements like whole-body or organ counting, to detect and quantify radionuclides that have been taken up by the body. This information is essential for assessing internal contamination and calculating the internal dose. Dosimetry estimates the absorbed dose to tissues from radiation exposure, but does not identify what radionuclide is present or where it is located inside the body. Radiography images internal structures using X-rays and isn’t used to quantify internal radionuclide content. Calorimetry measures heat from radioactive decay and isn’t used for locating or quantifying radionuclides in a person.