Air quality. Guidelines for estimating measurement uncertainty1 Scope This International Standard provides comprehensive guidance and specific statistical procedures for uncertainty estimation in air quality measurements including measurements of ambient air, stationary source emissions, indoor air, workplace atmospheres and meteorology. It applies the general recommendations of the Guide to the Expression of Uncertainty in Measurement (GUM) to boundary conditions met in air quality measurement. The boundary

and fission chambers or fission counters

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geotechnical and materials

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Concept diagram showing the twelve different definitions of size