Multiple choice

The radiactive isotope used for locating brain tumors and damaged heart cells is

  1. iodine-131

  2. thallium-201

  3. technetium-99m

  4. sodium-24

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Technetium-99m is used for locating brain tumors and damaged heart cells.Technetium-99m is probably the most widely used radioisotope in medicine today; it is a decay product of molybdenum-99.