Abstract
Coffee is becoming one of the most popular beverages in Mexico. In the present work, X-ray Fluorescence (XRF) was used to determine the contents of several elements (with atomic numbers between 11 and 38) in 11 samples of commercial ground coffee, comparing with another one of soluble coffee and two of used ground coffee. Samples were dried at room temperature and pelletized. XRF analyses were carried out using a spectrometer based on an Rh X-ray tube, registering the characteristic x-rays with a Silicon Drift Detector. The system detection calibration and accuracy check was performed through the analysis of NIST certified reference materials 1547 (peach leaves), 1570a (spinach leaves), 1573a (tomato leaves), and 1571 (orchid leaves). As a general rule, the elemental concentrations measured are similar in all samples of coffee, in values not exceeding toxic levels. However, the differences among the elemental concentrations are shown.
Highlights
The study of interactions of photons with material has an important role in the field of nuclear engineering, space technology, medicine and biology, agriculture and industry
Mass attenuation coefficient is a fundamental parameter of radiation interaction, from which the other radiological parameters like half Value Layer [half value layer (HVL)], tenth Value Layer [tenth value layer (TVL)], total atomic and electronic cross-sections, mass energy absorption coefficient, KERMA, CT number and effective atomic number are deduced
Mass attenuation coefficients are determined experimentally for some organic compounds at 122 keV incident photons using narrow-beam transmission geometry to establish a relation between effective atomic number (Zeff) and other deduced parameters
Summary
The study of interactions of photons with material has an important role in the field of nuclear engineering, space technology, medicine and biology, agriculture and industry. The effective atomic number is the ratio of total atomic cross-section to the total electronic cross-section for a mixture/compound and varies with incident photon energy that provides conclusive information of number of parameters. This radiological parameter has number of applications and is useful in dosimetric studies for calculation of radiation dose and shielding. The WinXcom [4] software package had made possible to evaluate the effective atomic number with more accuracy It provides the information content for essential amino acids over wide range of incident photon energies above 1 keV-100 GeV [5]. Several investigations [7,8,9,10] had determined the parameters like mass attenuation coefficient, effective atomic number, electron density, half value layer (HVL), tenth value layer (TVL), atomic and electronic cross-sections, and mass energy absorption coefficients
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
