Safecast is interesting, been following it for a while since I am taking a group of college students to Japan shortly.
But do spend some time researching what mainstream scientists have to say about the accuracy of the readings that "lay people" come up with using less than laboratry grade instruments and mostly having a lack of technical schooling in how to actually use the stuff they do have.
So it is just one more source of potential information to add to all the stuff out there.
I was the original poster. Unfortunately after trying to post the picture, I lost the address of the original data I found from a scientist in Japan. I am still trying to find it again. If I do... I will post it. It was good some information.