United States Nuclear Regulatory Commission - Protecting People and the Environment

Thorium-229

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-229 W, see 226Th 6E-1
Bone Surf
9E-4
Bone Surf
4E-13 - - -
(1E+0) (2E-3) - 3E-15 2E-8 2E-7
Y, see 226Th - 2E-3
Bone Surf
1E-12 - - -
- (3E-3) - 4E-15 - -
Page Last Reviewed/Updated Thursday, July 10, 2014