United States Nuclear Regulatory Commission - Protecting People and the Environment

Thorium-227

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)
90 Thorium-227 W, see 226Th 1E+2 3E-1 1E-10 5E-13 2E-6 2E-5
Y, see 226Th - 3E-1 1E-10 5E-13 - -
Page Last Reviewed/Updated Thursday, July 25, 2013