<prompt> All are used in brachytherapy EXCEPT:I125I131Cs137Iridium 192  <response>: ANSWER: B I131REF: APPENDIX-67 for ISOTOPES USED IN RADIOTHERAPY APPENDIX - 67Isotopes Used in RadiotherapyIsotopeHalf LifeUsesTechnetium 996 hoursBone scanCobalt 60 Artificial5.27 yearsTeletherapy BrachytherapyIodine 12313 hoursRadioactive iodine uptakeIodine 12560 daysBrachytherapy PIodine 1318 daysRadiotherapyIodine 1322.3 hours min Radium1622 years maxNot used now a daysAu 198 gold2.7 daysBrachytherapy PPd 103 palladium17 daysBrachytherapy PCesium 1319.7 daysBrachytherapy PCesium 13730 yearsTeletherapy 81 Brachytherapy TIridium 192 Artificial74 daysBrachytherapy TStrontium 9029 yearsBrachytherapy TRadon 2223.8 daysBrachytherapy TBrachytherapy can be of two types, permanent implant P or temporary implant T 