 In nuclear energy applications , xenon is used in bubble chambers , probes , and in other areas where a high molecular weight and inert nature is desirable . A by @-@ product of nuclear weapon testing is the release of radioactive xenon @-@ 133 and xenon @-@ 135 . The detection of these isotopes is used to monitor compliance with nuclear test ban treaties , as well as to confirm nuclear test explosions by states such as North Korea . 
