Radiation therapy involves applying high energy beams of radiation to certain areas of the body. This kills cancer cells directly as the energy from the beams disrupts the cells. Chemotherapy
on the other hand, involves the use of medications that target cancer cells and kill them that way.
The two techniques are very different from each other and it is not really a matter of one being superior to the other. Instead, they have different indications and usages, as some types of cancer respond better to radiation therapy and some types of cancer respond better to chemotherapy. A few types of cancer are treated best by combining both chemotherapy and radiation therapy.
The side effects of the two methods are different. Radiation therapy is more likely to cause local side effects where the beams pass through, such as burns, soreness, and scarring. Chemotherapy is more likely to cause the body wide symptoms, such as fatigue and hair loss
Without knowing what kind of cancer you are dealing with and how severe it is I cannot speculate as to which type of treatment would be used in your case. Therefore, you will need to talk to your cancer doctor
, who will be able to answer your questions.