EDXRF imaging of Pb in glazed ceramics using a micropattern gas detector

Silva, A. L. M.; Oliveira, C. A. B.; Gouvêa, A. L.; Dos Santos, J. M. F.; Carvalho, M. L.; Veloso, J. F. C. A.
December 2009
Analytical & Bioanalytical Chemistry;Dec2009, Vol. 395 Issue 7, p2073
Academic Journal
A new system for energy-resolved X-ray fluorescence imaging using a microhole and strip plate (MHSP), a new type of micropattern gas detector (MPGD), is proposed. It works as a single photon counting detector with position and energy detection capability. The interaction of X-rays with the gas medium produces electrons via the photoelectric effect, and the number of electrons is proportional to the absorbed X-ray energy. These electrons are further multiplied in the MHSP. Position detection is achieved using the charge division method. The detector has an active area of 28 × 28 mm2 and shows good position resolution, about σ = 125 μm, an intrinsic energy resolution of about 14% FWHM for 5.9 keV X-rays, and a counting rate capability of up to 0.5 MHz. The system has shown good properties for energy-dispersive X-ray fluorescence (EDXRF) applications, since it allows efficient energy and position detection of fluorescence X-rays from multielemental samples. In this work, the system was used to study lead depth distributions in eighteenth-century Portuguese faiences from the Santa Clara-a-Velha monastery. The fluorescence images were obtained by irradiating the samples, with a pinhole placed between the sample and the detector to focus the radiation into the detector. The results are presented here, including the elemental map distributions for different samples.


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