dir.dermal: dir.dermal

In HumanExposure/SHEDSDevel: The SHEDS-HT model for estimating human exposure to chemicals.

Description

Models the dermal exposure scenario for each theoretical person.

Usage

dir.dermal(sd, cd)

Arguments

sd	The chemical-scenario data specific to relevant combinations of chemical and scenario. Generated internally.
cd	The list of scenario-specific information for the chemicals being evaluated. Generated internally.

Details

The dermal exposure scenario is relatively straightforward. The function produces a prevalence value, which reflects the fraction of the population who use this scenario at all. It also produces a frequency value, which is the mean number of times per year this scenario occurs among that fraction of the population specified by prevalence. Since SHEDS operates on the basis of one random day, the frequency is divided by 365 and then passed to the p.round (probabilistic rounding) function, which rounds either up or down to the nearest integer. Very common events may happen more than once in a day. The function also produces a mass variable, which refers to the mass of the product in grams in a typical usage event. The composition is the percentage of that mass that is the chemical in question. The resid variable measures the fraction that is likely to remain on the skin when the usage event ends. The final output is the total dermal exposure for each chemical-individual combination in micrograms, which is the product of the above variables multiplied by a factor of 1E+06.

Value

dir.derm For each person, the calculated direct dermal exposure that occurs when a chemical-containing product is used. This does not include later contact with treated objects, which is indirect exposure.

Author(s)

Kristin Isaacs, Graham Glen

See Also

run, p.round

HumanExposure/SHEDSDevel documentation built on Oct. 30, 2019, 6:49 p.m.