A quantity expressing the increase in risk per unit of exposure or per unit dose.
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from ICRP Publication 126, 2014
Increase in risk per unit exposure or per unit dose. In general expressed as excess relative risk per working level month per J h m-3 per 100 Bq m-3 or per Sv.
from ICRP Publication 115, 2010
Increase of risk per unit exposure or per unit dose. In general, expressed as excess relative risk per WLM, per Jh/m3, per 100 Bq/m3, or per Sv.