There are various versions of maps of Japan showing where radiation fallou8t has been detected. I’ll use sone of Japan’s official (gov) maps.
Note that these maps tend to report Cesium but there are several other contaminants there as well (e.g., Strontium) so these maps report a fraction (tested) of the contaminants present.
http://ex-skf.blogspot.com/2011/09/radiation-map-by-ministry-of-education.html
I remember back in the 50s - 60s on the dairy farm, some whacky forerunners of the AGW loonies of today, were giving themselves hernias over supposed Strontium 90 in the milk from cows grazing on grass that contained nuclear fallout.
That slowly fizzled out and went away, as I hope this current AGW lunacy soon does....but probably won’t because prostitute politicians and media types have become co-conspirators in the fraud.