A map of strontium-90 contamination around Chernobyl has been published by the IAEA. This tends to be used in palliative care to reduce the pain due to secondary tumors in the bones.ĩ0Sr has a fission yield of about 1% and a half-life of 28.8 years. On the other hand, this also allows 89Sr to be used in the open source radiotherapy of bone tumors. While the atom yield of strontium is low, the strontium radioisotopes are very important as strontium is a calcium mimic which is incorporated in bone growth and therefore has a great ability to harm humans.
Increase of fission gases above a certain limit can lead to fuel pin swelling and even puncture, so that fission gas measurement after discharging the fuel from reactor is most important to make burn-up calculations, to study the nature of fuel inside the reactor, behaviour with pin materials, for effective utilisation of fuel and also reactor safety. Strictly speaking, the stage which is detected is the dissolution of used nuclear fuel in nitric acid, as it is at this stage that the krypton and other fission gases like the more abundant xenon are released. This krypton release can be detected and used as a means of detecting clandestine nuclear reprocessing. During the fuel dissolution this radioactive krypton is released into the air. Only 20% of the fission products of mass 85 become 85Kr itself the rest passes through a short-lived nuclear isomer and then to stable 85Rb. Krypton-85 is formed by the fission process withĪ fission yield of about 0.3%.
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