Americium 241- RAD NET data does not have a media search tool on site

In attempting to understand recent Gamma Spikes in Kansas City
http://www.epa.gov/radnet/radnet-data/radnet-kansascity-bg.html
I decided to spend more time reading the EPA site. The EPA references Americium 241 interaction as a cause an example of a cause of the spikes. It also appears this is a product of plutonium fission. I could not find a single media that lists Americium data. Have I found an EPA loophole in their data. Given the MOX fuel you would think it would be listed in their search engine.

EPA fail

If they don't test for it, it's not here?