United States Nuclear Regulatory Commission - Protecting People and the Environment

Protactinium-231

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)
91 Protactinium-231 W, see 227Pa 2E-1
Bone Surf
2E-3
Bone Surf
6E-13 - - -
(5E-1) (4E-3) - 6E-15 6E-9 6E-8
Y, see 227Pa - 4E-3
Bone Surf
2E-12 - - -
- (6E-3) - 8E-15 - -
Page Last Reviewed/Updated Thursday, July 10, 2014