Ahhhhh...your actual samples are most likely from nuclear reactors or other airborne nuclear sources. My radioactive sources are the real deal...as in Uranium/Pitchblende sources from non-active mines. So instead of tiny traces on a piece of paper, I am getting actual chunks of ore. I also use UV flashlights to hunt for chunks of ore. There are no nuclear reactors in New Mexico, although it is the 2nd richest state for uranium deposits. Most of the uranium is in the northern part of the state in Grants County (especially Indian reservations). But there are some mines no longer used here in southern New Mexico and they still have some ore to be obtained. Don't worry, I am very careful about watching the readouts of the ore before handling them.

My brother lives in New Mexico. He said there many military nuclear sources there.

Yes, that's true. MANY military/government locations (Los Alamos is here). Some military locations are well known (Roswell) and some aren't. But there are no nuclear power reactors in the state. And digging for uranium has stopped for many years. "Although New Mexico has the second largest identified uranium ore reserves of any state in the United States (after Wyoming), no uranium ore has been mined in New Mexico since 1998"...from Wikipedia.
Actually, in my location there is a higher risk of a toxic chemical spill from the chemicals used in the copper mines than a nuclear accident. The chemicals are transported by rail and truck and one truck already had an accident in the heart of our town. Fortunately it was right across the street from the fire department so they got the chemicals washed away pretty quickly.