actinium series造句

• The actinium series, has 15 members and eventually decays into lead-207.
• The three isotopes lead-206, lead-207, and lead-208 represent the ends of three decay chains : the uranium series ( or radium series ), the actinium series, and the thorium series, respectively.
• Three main decay chains ( or families ) are observed in nature, commonly called the thorium series, the radium or uranium series, and the actinium series, representing three of these four classes, and ending in three different, stable isotopes of lead.
• The method relies on two separate decay chains, the uranium series from 238 U to 206 Pb, with a half-life of 4.47 billion years and the actinium series from 235 U to 207 Pb, with a half-life of 710 million years.
• In this scheme, 227Th was named radioactinium ( RdAc ), 228Th radiothorium ( RdTh ), 230Th ionium ( Io ), 231Th uranium Y ( UY ), 232Th thorium ( Th ), and 234Th uranium X1 ( UX1 ) . [ 18 ] This reflects that 227Th and 231Th occur in the decay chain of natural 235U ( the actinium series ), 228Th occurs in the decay chain of 232Th ( the thorium series ), and that 230Th occurs in the decay chain of 238U ( the uranium or radium series ) . "-- think this belongs here, except needs to be re-written into a nice story : after you mention the first discovery of radioactivity, it generally makes sense to say something along the lines of " Research on radioactivity sparked like fire, and many new nuclides have been found that received their own names : . . . At one moment [ say when ], however, it became apparent that all of these were isotopes of the same element as the nuclide that was at that time referred to as " thorium " [ Th's only natural one, 232Th ].