Effective dose-rate [nSv h⁻¹ Bq⁻¹ kg]; ambient dose equivalent rate, [nSv h⁻¹ Bq⁻¹ kg]; and air kerma rate, [nGy h⁻¹ Bq⁻¹ kg], coefficients for nuclides uniformly distributed to an infinite depth in the soil.

and were estimated at 1 m above the ground. Here, 15-y, 10-y, 5-y, and 1-y indicate 15-, 10-, 5-, and 1-year-old children, respectively.