Question

radiosotopes often emit one or more types of radiation, including alpha particles, beta particles, and gamma rays. the distance the radiation travels through matter before being absorbed increases in order from alpha to gamma. which statement describes the best radioisotope that can be used for radioisotope imaging and for radionuclide therapy? it emits only gamma rays. it emits only alpha particles. it emits alpha and beta particles. it emits beta particles and gamma rays.

Explanation:

For radioisotope imaging, the radiation needs to travel through the body to be detected outside, and for radionuclide therapy, the radiation should be able to reach the targeted cancer - cells. Gamma rays have the longest range among alpha, beta, and gamma radiations, allowing them to pass through the body for imaging and also reach deeper - seated cancer cells for therapy.

Answer:

It emits only gamma rays.