The<unk>  <unk>  in<unk> biology refers to the<unk>  of therapeutic or detrimental effect of ionizing radiation due to the presence of oxygen. The effect is most notable in ionizing radiation dose.
Oxygen Enhancement Ratio
Ventilation/perfusion ratio
Arteriovenous oxygen difference
Diffusion capacity
Stroke volume
Volumetric flow rate
Fraction of inspired oxygen
Cardiac output