<unk> s are chemical-specific, i.e. the EPA determines a unique<unk>  for every substance it evaluates. Often separate acute and chronic<unk> s are determined for the same substance.<unk> s are specific to dietary exposure. When assessing inhalation exposure, EPA uses<unk>  concentrations" (RfCs), instead of<unk> s. Note that<unk> s apply only to non-cancer effects. When evaluating carcinogenic effects, the EPA uses the Q1* method.
Reference dose
Equivalent dose
Effective dose 
Threshold dose
Dose profile
Relative biological effectiveness
Relative value unit
Absorbed dose