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Some of them are so concerned because their father or their grandfather - - I know three of them - - their fathers ' have died because of black lung and their grandfather is now are carrying a bottle of oxygen with him . Reoxygenation depends on the presence of oxygen in the nucleus of the cell when radiation is delivered to achieve tumor response to treatment ( cell death ) . In a molecular sieve air is pumped through a ceramic filter which preferentially absorbs nitrogen increasing the concentration of oxygen in the air exiting the filter . The lack of oxygen in the body can damage organs . Besides introducing inoculation for small-pox into Austria Ingen-Housz proposed the inhalation of oxygen in diseases of the lungs .