LIMITS OF DETECTION OF AN TOTAL REFLECTION X-RAY FLUORESCENCE SYSTEM WITH DOUBLE REFLECTION MODULE V. F. Nascimento Filho 1,2, V. H. Poblete 3 P., P. S.

Apresentação em tema: "LIMITS OF DETECTION OF AN TOTAL REFLECTION X-RAY FLUORESCENCE SYSTEM WITH DOUBLE REFLECTION MODULE V. F. Nascimento Filho 1,2, V. H. Poblete 3 P., P. S."— Transcrição da apresentação:

1 LIMITS OF DETECTION OF AN TOTAL REFLECTION X-RAY FLUORESCENCE SYSTEM WITH DOUBLE REFLECTION MODULE V. F. Nascimento Filho 1,2, V. H. Poblete 3 P., P. S. Parreira 1,4, E. Matsumoto 5, S. M. Simabuco 5, E. P. Espinoza 1 V., A. A. Navarro 1 1 Lab. Instrumentação Nuclear/CENA/USP, Piracicaba, São Paulo, Brazil 2 Dept. Física e Meteorologia/ESALQ/USP, Piracicaba, são Paulo, Brazil 3 Lab. Fluorescencia de Rayos X/CCHEN, Santiago, Chile 4 Dept. Física/CCE/UEL, Londrina, Paraná, Brazil 5 Dept. Recursos Hídricos/FEC/UNICAMP, Campinas, São Paulo, Brazil Financial support: FAPESP

2 INTRODUCTION CHARACTERISTICS OF THE TECHNIQUE: *MULTIELEMENTAR, SIMULTANEOUS AND INSTRUMENTAL *ATOMIC NUMBER > 13 *HIGH GEOMETRIC EFFICIENCY DETECTION *LOW SAMPLE VOLUMES *MATRIX EFFECT CORRECTION NOT NECESSARY *LOW LIMITS OF DETECTION CAN BE USED FOR : ENVIRONMENTAL MONITORING BIOLOGICAL FLUIDS CONTROL QUALITY OF HIGH PURITY PRODUCTS SOLID SAMPLES (AFTER DIGESTION)

3 Total reflection fluorescence system (TXRF): visualization of the tower with the X-ray tube (XRT), high voltage generator (HVG), X-ray detector (XRD) and the total reflection module (TRM).

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5 CONCLUSIONS LIMIT OF DETECTION volume of the sample on the support: 50 microliters excitation/detection time: 1000 seconds CHROMIUM IRON COPPER ZINC liquid samples: 18 9 7 6 ppb solid sample: 10 mg digestion; 1 ml final volume 1.8 0.9 0.7 0.6 ppm aerosol filter: 10 m 3 collected volume; digestion; 1 ml final volume 1.8 0.9 0.7 0.6 ng/m 3 Financial support: FAPESP

6 RELATIVE SENSITIVITY

7 LIMITS OF DETECTION

8 REGRESSION LINES

9 MULTI-PURPOSE SYSTEM FOR EDXRF

10 FUNDAMENTAL EQUATION

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13 REFLECTIVITY AND PENETRATION DEPTH