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The 222Rn regional background value in surface water was tentatively established at 1 pCi/L, on the basis that generally there is no 222Rn in surface water (Ellins et al. 1990). This result indicates that, at the sampling moment, surface flow predominated and groundwater contribution was approximately only in the order of 2% (Table 9, Figure 8).

Table 9

Results of calculation of the %Qgw in the A3 section

StationQsw (m3/s)222Rnsw (pCi/L)222Rngw (pCi/L)222Rnf (pCi/L)Qgw (m3/s)%Qsw
A3 (Ají stream) 0.8 4.5 274 0.013 1.60 
StationQsw (m3/s)222Rnsw (pCi/L)222Rngw (pCi/L)222Rnf (pCi/L)Qgw (m3/s)%Qsw
A3 (Ají stream) 0.8 4.5 274 0.013 1.60 

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