Page 664 - Radiation Safety
P. 664

NATURAL RADIONUCLIDES SERIES







                                    SERIES                        Emitters                    End-Up                             Total activity

                                                                                               nuclide                        concentration at


                                                                                                                                   equilibrium




                                  Uranium                              8 α                     Pb-206                           14x any single

                                     U-238                             6 β                                                radionuclide activity


                                   (4n + 2)



                                  Actinium                             7 α                     Pb-207                           11x any single


                                     U-235                             4 β                                                radionuclide activity


                                   (4n – 1)

                                   (4n + 3)




                                   Thorium                             6 α                     Pb-208                           10x any single


                                    Th-232                             4 β                                                radionuclide activity


                                       (4n)
   659   660   661   662   663   664   665   666   667   668   669