RM is eliminated from the body by which processes?

RM is eliminated from the body by which processes?

• A. decay naturally overtime
• B. biological samples of fecal material/urine
• C. decay and biological elimination
• D. None of the above

Answer: (C)

Radioactive material inside the body leaves through two main pathways: physical decay of the radionuclide and biological elimination via the body's natural processes (urination, bowel movements, sweating, wound exudate, etc.). Decay reduces the amount of radioactive material over time regardless of the body's actions, while biological elimination physically removes it from the body. Together, these two mechanisms determine the overall rate at which activity decreases, often described by the effective half-life which combines both physical decay and biological clearance. If you only mention decay, you ignore the body’s excretion; if you only mention excretion, you ignore ongoing decay. That’s why the option stating both decay and biological elimination is the best answer. None of the others fully capture both processes.

Radioactive material inside the body leaves through two main pathways: physical decay of the radionuclide and biological elimination via the body's natural processes (urination, bowel movements, sweating, wound exudate, etc.). Decay reduces the amount of radioactive material over time regardless of the body's actions, while biological elimination physically removes it from the body. Together, these two mechanisms determine the overall rate at which activity decreases, often described by the effective half-life which combines both physical decay and biological clearance.

If you only mention decay, you ignore the body’s excretion; if you only mention excretion, you ignore ongoing decay. That’s why the option stating both decay and biological elimination is the best answer. None of the others fully capture both processes.