Sediment Distribution Coefficients and Concentration Factors for ...

TABLE VIII. (cont.)ElementIAEA-TECDOC-211 Recommendedvalue a [179] value a NoteTm — (9 × 10 4 ) P20Yb — (9 × 10 4 ) P20Hf — (9 × 10 4 ) P20Ta — (9 × 10 4 ) P20W — (9 × 10 4 ) P20Ir — (9 × 10 4 ) P20Hg — 1 × 10 5 P10Tl — (1 × 10 3 ) P17Pb 1 × 10 4 1 × 10 5 P10Po 1 × 10 4 7 × 10 4 P21Ra 1 × 10 2 2 × 10 3 P22Ac 1 × 10 4 1 × 10 4 P13Th 1 × 10 4 4 × 10 5 P10Pa 1 × 10 3 1 × 10 3 P13U 5 × 10 0 2 × 10 1 P23Np (2 × 10 3 ) 1 × 10 2 P24Pu (2 × 10 3 ) 2 × 10 5 P24Am (2 × 10 3 ) 2 × 10 5 P24Cm (2 × 10 3 ) 2 × 10 5 P25Bk — (2 × 10 5 ) P26Cf (2 × 10 3 ) 2 × 10 5 P24a Values in parentheses are best estimates: see Section 3.3.NOTES TO TABLE VIIIP1P2The recommended CF was derived assuming a sodium concentration in phytoplanktonof 6 g/kg dry weight [55].Bowen reports a concentration range of 3 to 6 g/kg dry weight [55]. An averagevalue of 4.5 g/kg dry weight was used to derive the recommended CF.P3 The recommended CF was derived using data from Lowman et al. [219].P4P5The recommended CF was derived assuming a calcium concentration in phytoplanktonof 6.1 g/kg dry weight [55].A range of chromium concentrations in phytoplankton of 2.2 to 7.5 mg/kg dryweight is given by Bowen [55]. A mean value of 5 mg/kg dry weight was used toderive the recommended CF.61