Fig. 1: The location of RadNet monitors and the UOGD wells (completed by 2017) in the continental U.S.
From: Unconventional oil and gas development and ambient particle radioactivity

The 157 RadNet monitors are categorized into O&G RadNet monitor (black edge) and Other RadNet monitors (no edge) based on whether a monitor is within 50 km of any O&G extractive activities.