Abstract
The average doses received by Ontario Hydro Nuclear Station [Canada] workers of various categories were extracted from the computer based dose record system. Extrapolations of the data predicted average lifetime doses for the highest exposed categories of workers in the range 43-114 rem. The estimate depends on the data base selected for extrapolation. The total risk facing a worker in any industry is comprised of 2 components; the risk from a chronic insult and the risk from an accident with immediate effects. The total risk facing radiation workers in the Ontario Hydro nuclear program is compared with the total risk as far as it is known facing workers in some other industries. On this basis, nuclear power station work is comparable to the average risk in North American industry.

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