Table 4.

Distribution of the cumulated recorded doses, extracted from the REIRS and Landauer databases, among the cohort of nuclear power plant workers; the doses are expressed in terms of personal dose equivalent.

Cumulated recorded dosea (mSv)	Number of workers	Percentage of workers
<10	181,948b	74.2
10 – 49	77,383	17.7
50 – 99	21,578	4.5
100 – 499	18,846	3.5
500 – 999	322	0.02
≥1,000	22	0.002
All	330,099b	100

^aThe dose is essentially due to low-LET radiation (external irradiation from photons).

^bSimilar to the study of atomic veterans where approximately 115,000 of the over 250,000 aboveground nuclear weapons test participants were selected for study on the basis of cost considerations, not all of the nuclear utility workers will be studied. A sample of workers with <5 mSv is being considered for inclusion and not the entire number of available workers such that the selected cohort of early nuclear power plant workers (1957–1985) will likely be of the order of 150,000.