Exploitable results
Data collected in the United Kingdom's National Registry for Radiation Workers (NRRW) have been analysed. Standardized mortality ratios (SMR) were calculated to compare the mortality of radiation workers with the general population of England and Wales. The SMR for all causes of death was 85, significantly below 100 at the 0.1% level. The SMR for all malignant neoplasms (86) was similarly below 100. This is a manifestation of the expected healthy worker effect. For all known cases of death except cancers the excess relative risk (RR) was almost exactly zero. For all malignant neoplasms the estimated excess RR was above zero, but was not statistically significant (p=0.10). For all neoplasms of the haematopoietic system the estimated excess RR was positive but not significant (p=0.3). For all leukaemias the excess RR was positive and closer to statistical significance (p=0.10). For leukaemias, except chronic lympatic leukaemia (CLL), the postive excess RR reached statistical significance. The lifetime risk estimate from combined studies (NRRW and United States nuclear worker survey) for all malignant neoplasms is 4.9% Sv{-1} (90% CI less than zero to 18) and for leukaemia is 0.3% Sv{-1} (90% CI less than zero to 1.04).
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