Cohort study

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Type of epidemiological study in which a population exposed to different levels of an agent (e.g. radiation) is followed over time for the occurrence of diseases. This type of epidemiological design was applied to the Japanese atomic bomb survivor study (Life Span Study) and most often used in underground miner studies on health effects of radon.

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from ICRP Publication 115, 2010

Type of epidemiological study in which a population exposed to different levels of radon and its progeny is followed over time for the occurrence of diseases (including lung cancer). This type of epidemiological design was most often used in underground miner studies. The exposure in time was considered for each individual on an annual basis.