Thanks for the headsup - but there's nothing wrong with some competition and not to mention getting more coverage; for example it doesn't look like they have any data near the coast of Fukushima preficture which is the most important spot. Also the monitoring does not appear in realtime and if we are getting nitpicky there are certainly a few UX issues with how the data is presented.

On a related note, I'm sure Ken Buesseler is a good guy and his site is nice and I have nothing bad to say about him; I don't know him - but you can find comments about him from people who claim he's a "nuclear shill" and so regardless as a matter of principal it would be prudent to get more independent researchers involved in gathering data.