#Fukushima I Nuke Plant: Krypton-85 and Xenon-131m in Reactor 2 Containment Vessel Air Samples

Diposkan oleh Pengetahuan dan Pengalaman on Thursday, August 11, 2011

Half life of xenon-131m is about 12 days.



The measurement of density of radioactive materials in the air inside the Reactor 2 Containment Vessel was delayed because there was water in the temporary sampling instrument that TEPCO installed outside the CV. It looks like they decided to measure the water anyway, as well as the air.



According to the measurement, the air is more radioactive than the water inside the Containment Vessel, but less radioactive than the air inside the Reactor 1 CV.



So the melted fuel is probably not even inside the Containment Vessel in Reactor 2 either.



But what's with krypton and xenon? I also read a tweet by one of the workers at the plant who said there is still radioactive iodine being released, even though TEPCO's monitoring says iodine-131 is not detected at the plant any more.



From TEPCO's handout for the press on August 10: