1) Biological science 2) Biology 
In simplest terms, radiobiology (also known as radiation biology) is a field of clinical and basic medical sciences that involves the study of the action of ionizing radiation on living things. ==Health effects== Ionizing radiation is generally harmful and potentially lethal to living things but can have health benefits in radiation therapy for th...
(from the article `radiation`) ...to X rays. These unfortunate early experiences eventually led to an awareness of radiation hazards for professional workers and stimulated the ...
Study of the scientific principles, mechanisms, and effects of the interaction of ionizing radiation with living matter. ... (12 Dec 1998) ... 
(ra″de-o-bi-ol´ә-je) the branch of science concerned with effects of light and of ultraviolet and ionizing radiations on living tissue or organisms. adj., radiobiolog´ical., adj.
Type: Term Pronunciation: rā′dē-ō-bī-ol′ŏ-jē Definitions: 1. The study of the biologic effects of ionizing radiation upon living tissue. Cf. radiopathology.
[n] - the branch of biology that studies the effects of radiation on living organisms
radiobiology The study of the biological effects of ionizing radiation upon living tissue.
noun the branch of biology that studies the effects of radiation on living organisms