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Occupancy factor

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The fraction of time for which a location is occupied by an individual or group.

(Adapted from IAEA Glossary, 2018)

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from ICRP Publication 136, 2017

For calculation of external doses the occupancy factor is the fraction of time that an organism spends at a speciļ¬ed location in its habitat (whether under- ground on the soil/sediment surface or fully immersed in air or water). (For non-human biota)