Dust exposures calculation details
The long term (chronic) dust exposure assessment can be split in dermal and oral exposure related to exposure to substances in dust. MCRA applies in principle the equations as used in RSExpo.
Dermal exposure
The calculation for dermal exposure is:
Parameters used in the equation
\(\mathtt{E_{air-inhal}}\) : average daily external exposure of an individual to substances by dust dermal contact (\(\mu g/kg \, bw /day\))
\(\mathtt{BW}\): body weight of the individual (default in \(kg\))
\(\mathtt{f_d}\): fraction of substance in dust available for dermal contact (%)
\(\mathtt{M_{adh,d}}\): amount of dust adhering to the skin (default in \(g/m^2/day\))
\(\mathtt{t_{dust}}\): time of home dust exposure
\(\mathtt{S}\): body surface (default in \(m^2\))
\(\mathtt{f_{s, d}}\): fraction of the body surface exposed to dust (%)
\(\mathtt{c_d}\): substance concentration in dust (default in \(\mu g/g\))
Ingestion exposure
The calculation for exposure through oral ingestion is:
Parameters used in the equation
\(\mathtt{E_{dust-ing}}\) : average daily external exposure of an individual to substances by dust ingestion (\(\mu g/kg \, bw /day\))
\(\mathtt{BW}\): body weight of the individual (default in \(kg\))
\(\mathtt{q_d}\): average daily amount of dust ingested by the individual (default in \(g/day\))
\(\mathtt{c_d}\): substance concentration in dust (default in \(\mu g/g\))