Baldwin TD and Hicks TW, Assessment Calculations for Human ...

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0977-6Version 1Table 5.3Summary of key exposure pathway parameters for each intrusion event. The choice of these parameter values is discussed byHicks and Baldwin (2011, §6.2).Intrusion parametersParameterB1aBoreholedrillerB1bTrial pitexcavatorB1cLaboratoryAnalystB3aConstructionworkerB3bHouseoccupantB7SmallholderIntrusion depth [m] 20 4.5 5 5Cross sectional area of intrusion [m 2 ] 0.025 2.3 400 50Extracted sample volume [m 3 ] 0.03Volume of mixed soil and excavated material [m 3 ] 2250Number of intrusion events [-] 5 20 25Inhalation pathwayC1ScavengerC2MaterialRecoveryworkerDust density [kg/m 3 ] 6E-07 6E-07 6E-07 6E-07 1E-07 1E-07 6E-07 6E-07Outdoor inhalation rate [m 3 /hr] 1.7 1.7 1.2 1.7 1.375 1.7 1.375 1.7Outdoor inhalation time [hr/yr] 16 1 2 80 1753.2 1461 50 40Ingestion pathwaySoil ingestion rate [kg/day] 0.00004 0.000005 0.00001 0.00004 0.000024 0.00002 0.000005 0.00004Soil ingestion time [day/yr] 2 1 1 10 365.25 365.25 50 5Crop ingestion rate [kg/yr] 250Goat’s milk ingestion rate [kg/yr] 215Egg ingestion rate [kg/yr] 20Pasture ingestion rate for goat [kg/yr] 500Soil ingestion rate for goat [kg/yr] 10Soil ingestion rate for hen [kg/yr] 1Galson Sciences Ltd 18 21 March 2011
0977-6Version 1External irradiationRadonParameterB1aBoreholedrillerB1bTrial pitexcavatorB1cLaboratoryAnalystB3aConstructionworkerB3bHouseoccupantB7SmallholderC1ScavengerC2MaterialRecoveryworkerOutdoor external irradiation time [hr/yr] 16 1 80 1753.2 1461 50 40Outdoor external irradiation scaling factor [-] 0.1 0.4 1 1 1 1 1Indoor external irradiation time [hr/yr] 2 7012.8 7305 365Indoor external irradiation scaling factor [-] 0.08 0.3 0.3 0.002Radon dose conversion factor [(Sv/h)/(Bq/m 3 )] 3.6E-09 7.13E-09 7.13E-09Thoron dose conversion factor [(Sv/h)/(Bq/m 3 )]9.1E-10Room ventilation rate [1/yr] 44000Room volume [m 3 ] 100Radon emanation coefficient [-] 0.2Thoron emanation coefficient [-] 0.2Galson Sciences Ltd 19 21 March 2011
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