When talking about the "quality of radiation," there are a few different synonyms that can be used to describe this concept. One such term is "radiation energy," which refers to the amount of energy that is being emitted by the radiation source. Another possible synonym is "radiation intensity," which describes the strength of the radiation being emitted. Additionally, "radiation dose" is another related concept that refers to the amount of radiation that an individual or object is exposed to. Finally, "radiation spectrum" can be used to describe the range of types of radiation that are present in a given environment. All of these terms are useful for discussing the various aspects of radiation and its effects on living organisms.