# Risk

A multi-attribute quantity expressing hazard, danger or chance of harmful or injurious consequences associated with actual or potential exposures. It relates to quantities such as the probability that specific deleterious consequences may arise and the magnitude and character of such consequences.

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## Previous glossary entries

### from ICRP Publication 132, 2016

Risk relates to the probability that an outcome (e.g. cancer) will occur. Terms relating to risk are grouped together here: Excess relative risk is the rate of disease in an exposed population divided by the rate of the disease in an unexposed population minus 1. This is often expressed as the excess relative risk per Sv. Relative risk is the rate of disease in an exposed population divided by the rate of the disease in an unexposed population.

### from ICRP Publication 126, 2014

Risk relates to the probability that an outcome (e.g. lung cancer) will occur. Terms relating to risk are grouped together here.

### from ICRP Publication 122, 2013

The probability of harmful or injurious consequences (e.g. cancer) associated with exposures or potential exposures in a year. It takes into account the probability of receiving a dose in a year, and the probability that the dose received will give rise to harm. Risk = likelihood of occurrence · seriousness if incident occurs.

### from ICRP Publication 115, 2010

Risk relates to the probability or chance that an outcome (e.g. lung cancer) will occur.