Define the term "radiobiology."

Radiobiology is defined as the study of the effects of ionizing radiation on biological organisms. This field examines how radiation interacts with living tissues, the biological responses to radiation exposure, and the mechanisms of damage at the cellular and molecular levels. Understanding radiobiology is crucial for evaluating the risks associated with radiation exposure, whether from natural sources, medical treatments, or occupational hazards. It also plays a key role in developing protective measures, improving radiation therapy for cancer treatment, and creating safety guidelines for radiation use in various settings.

The other options, while related to aspects of radiation and its application, do not accurately capture the full scope of radiobiology. For example, studying radioactive isotopes focuses more on the chemical and physical properties of these isotopes rather than their biological impact. Similarly, the study of medical imaging techniques and radiation therapy methods pertains more to practical applications and techniques rather than the fundamental biological effects of ionizing radiation.