Radioisotope

Dose conversion factors (mSv Bq-1)

  <1 y 2–7 y ≥ 17 y
214Bi 1.4 × 10-9 3.6 ×10-10 1.1 × 10-10 (Ajayi and Owolabi 2007)
226Ra 4.7× 10-6 6.2 ×10-7 2.8 × 10-7 (Ajayi and Owolabi 2007)
228Ac 7.4 × 10-9 1.4 × 10-9 4.3 × 10-10 (Ajayi and Owolabi 2007)
212Pb 1.5 ×10-7 3.3 × 10-8 6.0 × 10-9 (Ajayi and Owolabi 2007)
235U 3.5 × 10-7 8.5 ×10-8 4.7 ×10-8 (Ajayi and Owolabi 2007)
40K 6.2 × 10-8 2.1 × 10-8 6.2 × 10-9 (Ajayi and Owolabi 2007)
238U 3.4× 10-7 8 ×10-8 4.5 ×10-8 IRPA 2010
Table 5: Dose conversion factors for ingestion of radionuclides in water [17,18].