Question

why are small amounts of radioisotopes used in medical diagnostics? they have a longer half - life than other substances. they produce high - energy emissions that can be detected. they are less expensive than other materials. they are easier to administer to patients.

Explanation:

In medical diagnostics, small - amounts of radioisotopes are used because they produce high - energy emissions that can be detected by imaging equipment to visualize internal body structures and functions. Their half - life is not necessarily longer than other substances, cost is not the main reason, and ease of administration is not the key factor compared to detectability.

Answer:

They produce high - energy emissions that can be detected.