Last week I wrote about how Arizona Radiation Regulatory Agency (ARRA) instruments detected trace levels of Iodine-131 in AZ air from the troubled nuclear power plant in Japan.  This week testing by ARRA and the AZ Dept. of Agriculture found trace levels of I-131 in the milk samples that they routinely monitor.  The levels are of no public health consequence (they’re thousands of times lower than any level of concern).  Still, it’s interesting that troubles with the plant on the other side of the Pacific can be detectable by these sensitive instruments. If you’re interested you can check out the data here.