Yep thats the one,

I was expecting the Log scale to go down the 1 part per million not 1 part per thousand.

To have some parts of California getting between 1 part per 10 and 100 of the radiation compared to a few hundred miles downwind from eastern Japan came as a bit of a surprise especially considering the distances involved and also considering the following link and the Estonian coal ship sample I mentioned earlier which was about 900 miles away from Chernobyl.

http://en.wikipedia.org/wiki/Chernobyl_disaster#Radiation_levels_2

Quote:
The radiation levels in the worst-hit areas of the reactor building have been estimated to be 5.6 roentgens per second (R/s) (1.4 milliamperes per kilogram), equivalent to more than 20,000 roentgens per hour. A lethal dose is around 500 roentgens (0.13 coulombs per kilogram) over 5 hours, so in some areas, unprotected workers received fatal doses within minutes. However, a dosimeter capable of measuring up to 1,000 R/s (0.3 A/kg) was inaccessible because of the explosion, and another one failed when turned on. All remaining dosimeters had limits of 0.001 R/s (0.3 ľA/kg) and therefore read "off scale." Thus, the reactor crew could ascertain only that the radiation levels were somewhere above 0.001 R/s (3.6 R/h, or 0.3 ľA/kg), while the true levels were much, much higher in some areas