tokens: Analysis of the uncertainties in the exposure calculation shall incorporate the uncertainties in the source data identified in Table 11 - 3 ( from the atomic bomb data ) and Table 11 - 4 ( from the space radiation field ) . NOTE 1 The uncertainties in risk estimates have been evaluated in detail in ‘ NCRP 1997 ’ [ 14 ] . The risk estimates are presented in a distribution that ranges from 1,15 to 8,1x10 - 2 Sv-1 for the 90 % confidence interval for the nominal value of 4 % per Sv for an adult US population . NOTE 2 Uncertainties also arise from systematic errors ( and potentially statistical errors in the case of Monte Carlo simulation ) in the radiation shielding calculation - see ECSS - E - HB-10 - 12 , Section 5.8 .