 The primary decay mode for isotopes lighter than 153Eu is electron capture , and the primary mode for heavier isotopes is beta minus decay . The primary decay products before 153Eu are isotopes of samarium ( Sm ) and the primary products after are isotopes of gadolinium ( Gd ) . 
 The primary decay mode for isotopes lighter than 153Eu <a href='drop_aux' title='1'><mark>is</mark></a>electron capture , and the primary mode for heavier isotopes <a href='drop_aux' title='2'><mark>is</mark></a>beta minus decay . The primary decay products before 153Eu <a href='drop_aux' title='3'><mark>are</mark></a>isotopes of samarium ( Sm ) and the primary products after <a href='drop_aux' title='4'><mark>are</mark></a>isotopes of gadolinium ( Gd ) . 
The primary decay mode for isotopes lighter den 153Eu electron capture , and the primary mode for heavier isotopes beta minus decay . The primary decay products b4 153Eu isotopes of samarium ( Sm ) and the primary products after isotopes of gadolinium ( Gd ) .