Abstract
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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Oxford Instruments, X-Ray Technology, Inc., 360 El Pueblo Road, Scotts Valley, CA 95066, USA (http://www.oxfordxtg.com).
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This work was partially supported by Projects CERN/FP/83487/2008 and PTDC/FIS/65455/2006 through FCT and FEDER programs.
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Silva, A.L.M., Oliveira, C.A.B., Gouvêa, A.L. et al. EDXRF imaging of Pb in glazed ceramics using a micropattern gas detector. Anal Bioanal Chem 395, 2073–2080 (2009). https://doi.org/10.1007/s00216-009-3196-8
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DOI: https://doi.org/10.1007/s00216-009-3196-8