United States Nuclear Regulatory Commission - Protecting People and the Environment

Cobalt-57

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)
27 Cobalt-57 W, see 55Co 8E+3 3E+3 1E-6 4E-9 6E-5 6E-4
Y, see 55Co 4E+3 7E+2 3E-7 9E-10 - -
Page Last Reviewed/Updated Thursday, July 25, 2013