The linear regression slope of 0.70 and intercept of 0.03 were influenced by the quantity of ABS data collected and model parameter input distributions at a site broader than those at other sites. ![]() Modeled breathing zone concentrations were statistically correlated (p-value < 0.001) with independently collected ABS concentrations. Both models predicted probability distributions of asbestos breathing zone concentrations that bracketed experimentally measured personal exposure concentrations. A Monte Carlo simulation calculated the breathing zone concentration probability distribution for each scenario. ![]() A Lagrangian model tracked the cumulative number of individual particles entering the breathing zone volume at a particular time. This surface wipe sample was taken on the operating room floor near the surgical technician. Cisplatin was detected above the LOQ of 0.031 g/sample on one of the 15 wipe samples taken. 3), or cotton glove samples (LOD 0.009 g/sample). The second scenario modeled exposure in a quiescent environment. ), personal breathing zone air samples (MDC 0.058 g/m. One scenario used an Eulerian model based on a Gaussian concentration distribution to quantify aerosol exposure in the trailing wake of a moving object. The model predicted the particle emission rate, tracked particle transport to the breathing zone, and calculated the breathing zone concentration for two scenarios. ![]() As an alternative approach, a probabilistic model based on aerosol physics and fluid dynamics was developed to predict the breathing zone concentration of a particulate contaminant emitted from a surface during activities of variable intensity. Activity based sampling determines the contaminant concentration in a person's breathing zone as they perform a scripted activity, such as raking a specified area of soil, while wearing appropriate sample collection instrumentation. Activity based sampling (ABS) is typically performed to assess inhalation exposure to particulate contaminants known to have low, heterogeneous concentrations on a surface.
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