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Abstract
Activation cross sections of xenon and krypton isotopes were evaluated as tag gases to identify capsule rupture in liquid metal cooled fast reactors. The accuracy of the activation cross sections was investigated with several tag gas samples irradiated in the standard neutron field of JOYO and YAYOI reactors. Comparing the measured radio activities and calculated values using YAYOI neutron fluence and activation cross section processed from the JENDL-3.2 cross section library yielded C/E values of approximately 0.86 to 2.6 for tag gas nuclides. The discrepancy between calculation and measurement appears due to the cross section uncertainty. This study confirmed the present accuracy of tag gas activation cross sections.