Abstract
Cascade centripeters were used to make measurements of aerosol activity size distributions in several buildings involved in the reprocessing of Magnox Nuclear Reactor Fuel on BNFL's Sellafield site. Whilst the 50 measurements made demonstrate significant variations in size distribution between buildings (2.8 µm-4.2 µm) and even between sampling locations within particular buildings (1.9 µm-9.0 µm), they demonstrate consistently larger particle sizes than the 1 µm AMAD default value recommended in ICRP Publication 30 and provide further empirical support for the adoption of a 5 µm AMAD default value as most recently proposed in ICRP Publication 66 for workplaces.
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