Natural radioactivity in groundwater and estimates of committed effective dose due to water ingestion in the state of Chihuahua (Mexico).

Villalba L1, Montero-Cabrera ME, Manjón-Collado G, Colmenero-Sujo L, Rentería-Villalobos M, Cano-Jiménez A, Rodríguez-Pineda A, Dávila-Rangel I, Quirino-Torres L, Herrera-Peraza EF.
Radiat Prot Dosimetry. 2006;121(2):148-57. Epub 2006 Jan 6.

https://www.ncbi.nlm.nih.gov/pubmed/17142821