NRPB - W1 Calculation of Resuspension Doses for Emergency Response

Synopsis

Following an accident, a number of potential pathways of exposure exist. In order to make decisions on countermeasures, there is a need to predict future pathways and exposure due to the inhalation of resuspended activity is one such pathway.

This paper reviews two types of resuspension methodologies: those using a resuspension factor, and those using a dust loading approach. A modified Garland formula for use in the UK for emergency response is recommended. Tables of the activity concentration in air due to resuspension and integrated doses due to the inhalation of resuspended air concentrations at a range of times, appropriate for wind driven resuspension in UK conditions are presented. The uncertainties associated with estimates of the activity concentration in air due to resuspension are discussed. Recommendations are given on scaling factors to account for mechanical disturbances, high winds and arid climates. A resuspension factor appropriate for indoors is also recommended.

Additional information

This work was carried out under the Environmental Assessments Department and Emergency Response Group Quality Management System which is certified to ISO 9001:2000, certificate No. 956546.

A non-technical summary  is also available.

Last reviewed: 29 July 2009