Exempt Liquid and Solid Concentrations, Exempt Quantities
(Tables 1 and 2 of OAR 345 Division 50. See notes at the end of this table.)
Element
|
Atomic Number
|
Chemical Symbol
|
Isotope
|
Concentration*
(See Table 1)
|
Quantity
(See Table 2)
|
---|
Many radioisotopes transform into isotopes that are also radioactive. In expressing the concentrations in Column 5 ("Concentration") of Table 1, the activity stated is that of the parent isotope and takes into account the daughters.
For purposes of OAR 345-050-0025, where a combination of isotopes is involved, the limit for the combination should be derived as follows:
Determine for each isotope in the product the ratio between the radioactivity concentration present in the product and the exempt radioactivity concentration established in Column 5 ("Concentration") of Table 1 for the specific isotope when not in combination.
The sum of such ratios must not exceed "1".
Concentration of Isotope A in Product
Exempt Concentration of Isotope A
|
+ |
Concentration of Isotope B in Product
Exempt Concentration of Isotope B
|
≤ | 1 |
Not included in division 50 tables - see OAR 345-050-0020 (2) and -0025 (2).
When Th-232 is present - Not included in division 50 tables - see OAR 345-050-0020 (3) and -0025 (3).
When certain wastes are out of equilibrium with U-238 - Not included in division 50 tables - see OAR 345-050-0020 (4).