Printed in Great Britain Radon Exposure and Leukaemia in Adulthood

Positive associations between leukaemia and radon concentrations have been observed in England, Scotland and Wales, and Canada. Results of a similar study for the populations of 41 French administrative areas ('departements') are reported for 1984-1986. The average indoor radon and gamma ray concentrations per 'departement ' range from 12 to 147 Bq.rrT3 and from 28 to 142 nG.h"1, respectively. Acute lymphoid leukaemia mortality rate is similar to the na-tional level, whereas an excess of acute myeloid leukaemia deaths is observed. According to Poisson regression models and modified tests for partial correlation, acute myeloid leukaemia mortality is significantly and positively related to in-door radon concentration whether or not adjustment is made for indoor gamma ray dose, socioeconomic status and linear gradient. This result reinforces the evidence that indoor exposure to high levels of radon is a leukaemic en-vironmental hazard. Geographical correlations have been reported between indoor radon concentration on the one hand, and in-cidence of acute myeloid leukaemia (AML), '~3 myeloid leukaemia (ML),2 acute lymphoblastic leukaemia (ALL),3-4and chronic lymphoid leukaemia (CLL),3on the other. Radon and its decay could be considered a