Table 1: The Standard reference values and experimental activity values of the IAEA reference soil 375 (Bq/kg ± SD).

RadionuclidesEnergy
(keV)
Experimental activity concentration Certified reference values

226Ra186.5 keV20.54 ± 0.920.0 ± 0.9
214Pb295.219.46 ± 0.8 19.96 ± 0.8
351.9220.61 ± 1.119.96 ± 0.5
214Bi176420.94 ± 0.819.96 ± 0.4
2477.722.46 ± 1.219.96 ± 0.9
40K1460499.93 ± 2.1423.40 ± 0.2
228Ac338.521.58 ± 1.520.46 ± 0.3
208TI860.422.20 ± 1.120.46 ± 0.3
2614.522.44 ± 1.720.46 ± 0.6
228Ac910.722.29 ± 0.720.46 ± 0.5
968.523.69 ± 0.920.46 ± 0.5