Radon in Soils of Parts of Cameron, Hidalgo, and Willacy Counties, Texas

The study area (see index map) includes parts of Cameron, Hidalgo, and Willacy Counites all of which are shown as zone 3 in Figure 1. High-resolution airborne gamma-ray data from Duval (2005) as well as regional data in Duval and Riggle (1999) indicate that specific geologic units within the study area have uranium concentrations greater than 3 ppm eU.

The geologic units in question are mapped by Page, VanSistine, and Turner (2005) as Holocene floodplain deposits of the Rio Grande and as members of the Beaumont Formation. This study examines whether the geologic units with higher uranium concentrations have more potential for indoor radon than other geologic units within the study area. [Summary provided by the USGS.]