Author: María Elena Montero Cabrera

PIXE study of Cuban quaternary paleoclimate geological samples and speleothems

MARIA ELENA MONTERO CABRERA (2000)

PIXE elemental analysis of sediments, speleothems, and other geological formations related to the karst of the Sierra de San Carlos is presented. The similarity of the elemental composition of the sediments studied, as well as the alluvial regime which created them, indicate their common origin at each location. The Sr/Ca concentration ratio of a stalactite indicates that the average atmospheric temperature 12,000 and 18,000 years B.P. was colder than that of 6000 years B.P.

Article

BIOLOGÍA Y QUÍMICA QUÍMICA

True coincidence summing corrections for an extended energy range HPGe detector

MARIA ELENA MONTERO CABRERA (2015)

True coincidence summing (TCS) effect for natural radioactive families of U-238 and Th-232 represents a problem when an environmental sample with a close source-detector geometry measurement is performed. By using a certified multi-nuclide standard source to calibrate an energy extended range (XtRa) HPGe detector, it is possible to obtain an intensity spectrum slightly affected by the TCS effect with energies from 46 to 1836 keV. In this work, the equations and some other considerations required to calculate the TCS correction factor for isotopes of natural radioactive chains are described. It is projected a validation of the calibration, performed with the IAEA-CU-2006-03 samples (soil and water).

Article

Calibration Isotopes Soils BIOLOGÍA Y QUÍMICA

Arsenic, lead, and uranium concentrations on sediments deposited in reservoirs in the Rio Grande Basin, USA–Mexico border

MARIA ELENA MONTERO CABRERA (2016)

The El Granero reservoir is the last reservoir of the Rio Conchos before it joins the Rio Grande at the Mexico–USA border. This reservoir, together with the San Marcos reservoir, is located in the arid region of Chihuahua, Mexico. High, naturally occurring radioactivity levels, as well as high arsenic (As) concentrations, have been found in both reservoirs. The main goal of this research was to establish the spatial and temporal distribution of trace and radioactive elements in surface sediments and cores collected from these reservoirs.

Article

210Pb-137Cs dating Arsenic Fresh water sediments Lead Pollution indicators Uranium BIOLOGÍA Y QUÍMICA QUÍMICA