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Mr Khan said:

Isn't Cesium in the class of elements that catch fire on contact with water? Or does the radioactive isotope not have that same effect?

Yeah, cesium is in that group but will only ignite on contact with water if it's in its elememtal form (I think!). In the rectors I think it's part of a cesium-uranium-oxide (or something like that) and so won't react with water, at least as far as I know!