is Cs(134) a fission product? I thought Cs(135), but my memory is going. And besides....um.....um...never mind. I forgot
I, of course, meant Cs(137)
I’m not sure the precursor for Cs(134). It is characteristic of the Fukushima problem, though:
http://www.livescience.com/43631-fukushima-radiation-ocean-arrives-west-coast.html