Quantification of the 214 Pb and 214 Bi decay products before and after to reach the secular equilibria with the 226 Ra

In this work a comparison between the 226 Ra concentration and its decay products (214 Pb and 214 Bi) in soil samples is presented before and after that the decay mentioned products reach the equilibria with the radium. Moreover, the obtained daughter/father ratio is presented; and the correction factor for the calculus of the 214 Pb and 214 Bi quantification without being necessary to wait until that the secular equilibria has been established. For the quantification of the concentration of the three radionuclides the gamma spectrometry technique was used. (Author)