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    • Total Terrestrial Gamma Activity Polygons for an Aerial Radiological Survey of Abandoned Uranium Mines, Navajo Nation, 1994-1999, USEPA and USDOE

    Metadata Updated: March 22, 2024

    This polygon shapefile presents ranges of ground surface exposure rate from total terrestrial gamma activity, and calculated from aerial gross count data (all gamma events in the range of 38-3026 keV). Forty one (41) aerial radiological surveys of potential uranium mining areas (1,144 square miles) were conducted within the Navajo Nation during the period from October 1994 through October 1999. The US Environmental Protection Agency (USEPA) Region 9 funded the surveys and the US Department of Energy (USDOE) Remote Sensing Laboratory (RSL) in Las Vegas, Nevada conducted the aerial surveys. The aerial survey data were used to characterize the overall radioactivity (ground surface exposure rate) and excess Bismuth 214 levels within the surveyed areas.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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    Dates

    Metadata Date September 25, 2017
    Metadata Created Date March 22, 2024
    Metadata Updated Date March 22, 2024
    Reference Date(s) []
    Frequency Of Update notPlanned

    Metadata Source

    Harvested from Environmental Dataset Gateway ISO Geospatial Metadata

    Additional Metadata

    Resource Type Dataset
    Metadata Date September 25, 2017
    Metadata Created Date March 22, 2024
    Metadata Updated Date March 22, 2024
    Reference Date(s) []
    Responsible Party U.S. Environmental Protection Agency, Region 9 (Publisher)
    Contact Email
    Guid 7B0FC4CE4C-FE9C-4375-B273-F51F0819776C
    Access Constraints https://edg.epa.gov/EPA_Data_License.html
    Bbox East Long -108.972101
    Bbox North Lat 37.160006
    Bbox South Lat 35.007696
    Bbox West Long -111.780543
    Coupled Resource
    Frequency Of Update notPlanned
    Harvest Object Id fcc1f9db-61b3-43f7-b6c1-8909eaf27693
    Harvest Source Id 9b3cd81e-5515-4bb7-ad3c-5ae44de9b4bd
    Harvest Source Title Environmental Dataset Gateway ISO Geospatial Metadata
    Licence Ground surface exposure rate measures total gamma radiation activity without considering constituent isotopic sources. 1144 square miles of the more than 25,000 square mile Navajo Nation were surveyed. This area does not include all areas that may have had uranium mining. Specifically, these surveys do not include the Grants Uranium District that is partially on the Eastern Agency of the Navajo Nation. Use of this data generally requires computer workstations with ESRI's Arc/Info (8.x or above), ArcGIS (8.x or above), or ArcView (3.x), or some other GIS or CAD software that is capable of reading or converting this dataset. The data are provided "as-is," without warranty of any kind, either express or implied. These data have been compiled as part of a desktop project to collect existing spatial data to support the study of Navajo abandoned uranium mines. No field verifications were undertaken as part of this desktop study.
    Lineage
    Metadata Language eng
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-111.780543, 35.007696], [-108.972101, 35.007696], [-108.972101, 37.160006], [-111.780543, 37.160006], [-111.780543, 35.007696]]]}
    Progress completed
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True

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