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RF (risk factor, lifetime risk of cancer death per person-WLM)
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This factor has uncertainty only
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RF=LN(µ ,σ
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µ= ln(2.83 × 10-4) σ = ln(1.53)
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UR (unit risk factor, lifetime risk of cancer death per pCi/L)
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Uncertainty = => Variability 5th percentile mean 95th percentile
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5th percentile 1.3 × 10-10 2.1 × 10-9 7.2 × 10-8
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median 3.4 × l0-10 5.1 × l0-9 1.8 × l0-8
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95th percentile 8.9 × 10-10 1.2 × 10-8 4.2 × 10-8
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C (concentration of radon in the water, pCi/L [water])
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Lognormal distribution LN(µ,σ)
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C = LN(µl,σl,) µ = TS(m,s,n) (σ)2=IChi(s,n)
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Student t distribution, TS(m,s,n) Inverse chi-squared distribution, IChi(s,n)
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n= 10 m = ln(200) s = ln(1.85)
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IR (individual risk, lifetime risk of cancers per person-year)
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Uncertainty==> Variability 5th percentile mean 95th percentile
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5th percentile 1.8 × 10-8 5.2 × 10-7 1.9 × 10-6
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median 5.4 × 10-8 1.3 × 10-6 5.0 × 10-6
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95th percentile 1.5 × 10-7 3.2 × 10-6 1.3 × 10-5
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