Question

Which of the following damages WBC, bone marrow and lymph nodes?

• A. Ca${}^{40}$
• B. I${}^{131}$
• C. Sr${}^{90}$
• D. Caesium

Answer 1

The correct option is B I${}^{131}$

I${}^{131}$ is a radionuclide that gets deposited in the bone marrow. Radioactive iodine emits high-energy gamma radiation which can damage body cells. It can cause leukemia, depression of the immune system or blood diseases of various kinds. Thus the correct answer is option B.