Reduction of uncertainties in exposure assessment based on environmental monitoring data

Open Access

Table 1

Uncertainties in monitoring data and methods to reduce uncertainties.

Monitoring method	Source of uncertainty	Type of uncertainty	Assessment of typical uncertainty	Reduction method
Stationary dose rate monitoring	Probe characteristics	Stochastic and systematic	Low, ∼15%
Stationary dose rate monitoring	Site characteristics	Systematic	High, factor of 2–3	Site characterisation
Mobile dose rate monitoring	Probe characteristics	Stochastic and systematic	Low, ∼15%
	Vehicle characteristics	Systematic	Moderate, up to a factor of 2	Vehicle characterisation
	Site/region characteristics	Systematic	High, factor of 2–3	Increased density of measurement points
Monitoring of airborne radioactivity	Sample measurement	Stochastic and systematic	Low, ∼5%
	¹³¹I speciation	Systematic	High, up to factor of 4.5	Dedicated collection using activated carbon
	Sampler characteristics	Systematic	Low, factor of 1.1
Monitoring of fallout	Sample measurement	Stochastic and systematic	Low, ∼5%
	Collector characteristics	Systematic	High
	Deposition surface characteristics	Systematic	High, factor of 0.25–4
Spatial interpolation	Site/region characteristics and the distribution of deposited activity		High	Increased density of measurement points

The qualitative assessment is here classified as: high: can decisively sway a decision, e.g. a systematic underestimation would cause a significant exceedance of an OIL level to go un-noticed; moderate: will cause a careful deliberation of a decision; low: no impact on a decision.

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