Naturally occurring radioactive elements depend on lithology geogenic characteristics, such as depositional, environmental, or diagenetic. Thus, evaluating these elements constitutes a tool to define ionizing radiation effect from rocky sequences. This study carried out in the Rancheria Sub-Basin establishes both characterization and assessment of this kind of material, known as NORM. The sampling included uranium-238, thorium-232, potassium-40, radon-226, and radon-222 in soil samples, cutting samples from the Molino-1 well, and radon in surface water. Bases on a radiometric methodology with a gamma-ray spectrometer for uranium-238, thorium-232, and potassium-40 and emanometric with ionizing chambers for radio-226 and radon-222. The analysis and results of the activity concentrations in soil samples of U-238, Th-232, K-40, and Ra-226 are 11.7 BqKg⁻¹, 33.0 BqKg⁻¹, 424.5 BqKg⁻¹, and 15.59 BqKg^-1, respectively, among the acceptable global averages. However, in some areas, observed values indicate high activity concentrations of U-238, Th-232, K-40, Ra-226, and Rn-222 in the soil of 50.2 BqKg⁻¹, 62.8 BqKg⁻¹, 1596.3 BqKg⁻¹, 44.25 BqKg⁻¹, and 112546.79 Bqm⁻³, respectively. Those activity concentrations were associated with zone lithology.

天然存在的放射性元素取决于岩性地质特征，例如沉积、环境或成岩作用。因此，评估这些元素构成了定义岩石序列电离辐射效应的工具。在 Rancheria Sub-Basin 进行的这项研究确定了这种材料的特征和评估，称为 NORM。采样包括土壤样品中的铀 238、钍 232、钾 40、氡 226 和氡 222，从 Molino-1 井中切割样品，以及地表水中的氡。基于辐射测量方法，使用用于铀 238、钍 232 和钾 40 的伽马射线光谱仪，以及用于 radio-226 和氡222 的电离室的测压法。U-238、Th-232、K-40、Ra-226土壤样品活性浓度分析及结果为11.7 BqKg^-1，33.0 BqKg ^-1，424.5 BqKg ^-1，和15.59 BqKg ^- 1，分别，可接受的全球平均之中。然而，在某些地区，观测值表明土壤中 U-238、Th-232、K-40、Ra-226 和 Rn-222 的高活性浓度为 50.2 BqKg ^-1、62.8 BqKg ^-1、1596.3 BqKg ^{- 1}、44.25 BqKg ^-1和 112546.79 Bqm ^-3分别。这些活动浓度与带岩性有关。