Question

how do radiopharmaceuticals help in diagnosing medical conditions? by reducing the size of tumors by altering the chemical structure of tissues by emitting radiation that can be detected by increasing the temperature of the body

Explanation:

Radiopharmaceuticals contain radioactive isotopes. When administered to the body, they localize in specific organs or tissues. The radiation they emit can be detected by imaging devices like gamma - cameras to create images for diagnosis. Reducing tumor size is a therapeutic effect, not diagnostic. Altering tissue chemical structure is not their diagnostic mechanism, and they don't increase body temperature for diagnosis.

Answer:

By emitting radiation that can be detected