However, a 2011 review of studies addressing childhood leukaemia following exposure to ionizing radiation, including both diagnostic exposure and natural background exposure  , concluded that existing risk factors, excess relative risk per Sv (ERR/Sv), is "broadly applicable" to low dose or low dose-rate exposure .
A 2011 review of studies addressing childhood leukaemia following exposure to ionizing radiation, including both diagnostic exposure and natural background exposure from radon , concluded that existing risk factors, excess relative risk per Sv (ERR/Sv), is "broadly applicable" to low dose or low dose-rate exposure , "although the uncertainties associated with this estimate are considerable". The study also notes that "epidemiological studies have been unable, in general, to detect the influence of natural background radiation upon the risk of childhood leukaemia"
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, "although the uncertainties associated with this estimate are considerable". The study also notes that "epidemiological studies have been unable, in general, to detect the influence of natural background radiation upon the risk of childhood leukaemia"