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Table XV. Radon Equilibrium Factors Indoors at Home
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Internal Dosimetry - index
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Table XIX. Thoron (220Rn) Equilibrium Factors


DOE-STD-1121-98
with a GSD = 2.0. These workplace equilibrium factors (Table XVI) are lower than many of the home
equilibrium factors given in Table XV.
Table XVI. Radon Equilibrium Factors Indoors at Work
Country
avg
sd
min max Reference
Environment
Rec.
Japan
0.28 0.09
Hattori and Ishida (1994)
PWR Aux Bldg
Japan
0.32 0.10
Hattori and Ishida (1994)
BWR Turb Bldg
0.30 0.10
AVERAGE
No. Studies
2
In modern underground uranium mines, with their large ventilation rates, equilibrium factors are low
(National Research Council 1991), as shown in Table XVII. The average of three studies is 0.27. Such
factors may apply to underground tunnel sites like the Waste Isolation Pilot Plant and the Yucca
Mountain facility.
Table XVII. Radon Equilibrium Factors in Uranium Mines
Country
avg
sd
min max Reference
Environment
Rec.
USA
0.29
Kotrappa and Mayya (1976)
USA
0.32
Holub and Droullard (1980)
USA
0.19
0.05  0.36 George et al. (1977)
All Studies
AVERAGE
0.27
No. Studies
3
recommendation
UNSCEAR (1988)
0.3
Non-uranium mines may have lower ventilation rates, and radon equilibrium factors are likely to be
higher, as shown in the four results listed in Table XVIII. The average of four studies is 0.55.
Table XVIII. Radon Equilibrium Factors in Non-Uranium Mines
Country
avg
sd
min max Reference
Environment
Rec.
Norway
0.50
Stranden and Berteig (1982a, 1982b)
Poland
0.30
Domanski et al. (1979)
Sweden
0.70
Snihs (1977)
UK
0.70
Strong et al. (1975)
AVERAGE
0.55
No. Studies
4
129


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