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[[File:Glossary Icon-2.png|100px|frameless|right|link=ICRP Glossary]]
The ratio of the absorbed dose required to cause the same biological endpoint in hypoxic conditions as in normoxic conditions. Hypoxia often occurs in the middle of a rapidly growing tumour. The OER of x rays is approximately 3 while high-LET radiation tends to show smaller OERs down to 1 indicating that high-LET radiation is effective against hypoxic tumours.
([[ICRP Publication 127]], 2014)
'''Return to [[ICRP Glossary|Glossary]]'''
The ratio of the absorbed dose required to cause the same biological endpoint in hypoxic conditions as in normoxic conditions. Hypoxia often occurs in the middle of a rapidly growing tumour. The OER of x rays is approximately 3 while high-LET radiation tends to show smaller OERs down to 1 indicating that high-LET radiation is effective against hypoxic tumours.
([[ICRP Publication 127]], 2014)
'''Return to [[ICRP Glossary|Glossary]]'''