Grau-Bové, J; Mazzei, L; Thickett, D; Vlachou-Mogire, C; Strlic, M; (2017) Diagrams of equal area coverage: a new method to assess dust deposition in indoor heritage environments. In: Bridgland, J, (ed.) ICOM-CC 18th Triennial Conference Preprints, Copenhagen, 4–8 September 2017. International Council of Museums (ICOM): Paris, France.

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Abstract

Particulate matter can cause a loss of value of in indoor heritage, and for this reason it is frequently monitored. The process of deposition is well-described by theoretical models that relate deposition rates with environmental variables. However, we find that the inputs and outputs of models are not directly relevant to preventive conservation. While heritage managers are concerned about area coverage by particulates, the existing models use deposition velocities as the main variable. We propose an improved graphical representation of predictions of deposition, that takes inputs that can be modified as part of preventive conservation plans (concentration and air movement) and an output that can be related to risk assessment and cleaning schedules (time to visible area coverage). By comparing the predictions with experimental data, we show that this approach is useful for small particles of outdoor origin. We also find that further research is needed to make numerical predictions relevant for cases where deposition involves coarse dust and is caused by visitor movement.

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