Algorithms for external dermal exposure Sample Clauses

Algorithms for external dermal exposure. ‌ Depending on the type of transfer coefficients that are used to estimate the dermal exposure, different sets of algorithms are used to estimate the dermal exposure. The transfer coefficients can be based on either potential dermal exposure or actual dermal exposure. Transfer coefficients based on potential dermal exposure allow to user to specify the clothing and gloves used by the worker. This is taken into account by using coverage and migration factors. Coverage factors define how much of the body surface area is covered by clothing, whereas migration factors define how much of the substance migrates through the clothing/gloves and reaches the skin of the worker. Transfer coefficients based on actual exposure already consider the amount of migration through protective and work clothing (Figure 5). Hence, there is no need to use coverage or migration factors when this type of transfer coefficients is used. Furthermore, separate or combined transfer coefficients for hand and body exposure can be used. In order to evaluate the effect of work clothing or gloves on workers’ exposure, a separate assessment of hand and body exposure is needed. This can be done by using separate transfer coefficients for hand and body exposure. A separate assessment for hand exposure is also needed as input to calculate the amount of oral exposure due to hand-to- mouth contact. However, it may be possible that only a combined transfer coefficient for total exposure is available. In this case, the user can specify how the exposure is distributed between the hands and the body or use the defaults provided in the software. Transfer coefficients based on potential dermal exposure: separate TC for hands and body DEHANDS = DFR X TCP,HANDS X T X MFG DEBODY,B = DFR X TCP, BODY X T X (1 - C) DEBODY,C = DFR X TCP,BODY X T X C X MFC Algorithm set 1 Where: DEhands Dermal exposure of the hands (µg/d) DFR Dislodgeable foliar residue (µg/cm²) TCp,hands Transfer coefficient for the hands based on PDE (cm²/hr) T Duration of exposure (hours/day) MFG Migration factor for gloves (%) DEbody,b Dermal exposure of bare body parts (µg/d) TCp,body Transfer coefficient for the body based on PDE (cm²/hr) c Coverage of the body, provided by clothing (%) DEbody,c Dermal exposure of covered body parts (µg/d) MFC Migration factor for clothing (%) Transfer coefficients based on potential dermal exposure: combined TC for hands and body DEHANDS = DFR X TCP, TOTALX FHANDS X T X MFG DEBODY,B = DFR X TCP,TOTAL X ...
Sample 1
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