United States Nuclear Regulatory Commission - Protecting People and the Environment

Radon-222

Atomic
No.
Radionuclide Class Table 1
Occupational Values
Table 2
Effluent Concentrations
Table 3
Releases to
Sewers
Col. 1 Col. 2 Col. 3 Col. 1 Col. 2
Oral
Ingestion
ALI
(µCi)
Inhalation Air
(µCi/ml)
Water
(µCi/ml)
Monthly
Average
Concentration
(µCi/ml)
ALI
(µCi)
DAC
(µCi/ml)
86 Radon-222 With daughters removed - 1E+4 4E-6 1E-8 - -
With daughters
present
- 1E+2
(or 4 working
level months)
3E-8
(or 0.33
working
level)
1E-10 - -
Page Last Reviewed/Updated Thursday, July 25, 2013