Article Author: Dr. Brian Plimley.
RadWatch postdoc Brian Plimley was backpacking in the Grand Canyon in November 2016 near Horn Creek, a stream marked on park maps as “Do Not Drink” as a result of an old uranium mine at the canyon rim above the creek. Brian was able collected samples of water and sediment from Horn Creek to be measured at the LBL Low-Background Facility. The results of those measurements are included in this article along with some discussion of what they tell us.