Late normal tissue responses

Radiation-induced normal tissue damage that in humans is expressed months to years after exposure (by definition, later than 90 days after the onset of radiotherapy).

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from ICRP Publication 118, 2012

Radiation-induced normal tissue damage that in humans is expressed months to years after exposure (by definition, later than approximately 90 days after the onset of radiotherapy). The ratio tends to be small (<5 Gy).