Energy Dispersive X-Ray Fluorescence Profile of Some Brazilian Postage Stamps

Radiology on postage stamps.

Analysis of Postage Stamps by Proton-Induced X-Ray Emission Spectrometry

Subtle variations in ink color and paper of postage stamps can affect their value and desirability to collectors and investors. Protoninduced Xray emission spectrometry (PIXE) is a generally nondestructive forensic analysis tool that reveals the concentrations of chemical elements in a sample. PIXE has been used for more than 30 years, sometimes in conjunction with other analytical methods, to ...

Postage stamps of ophthalmological interest.

POSTAGE stamps of ophthalmological interest include portrait figures of two practising ophthalmologists, Ferdinand Ritter von Arlt (1812-87) and Franz Cornelius Donders (1818-89). Four further portrait figures of scientists who have directly or indirectly contributed greatly to ophthalmology are shown in the stamps commemorating Johannes Evangelista Purkinje (1787-1869), Hermann von Helmholtz (...

Determination of multi-element profiles of street dust using energy dispersive X-ray fluorescence (EDXRF).

Street dust samples have been collected in different areas in Hong Kong associated with various levels of traffic and pedestrian flow, and the concentrations of 23 chemical elements have been determined using energy dispersive X-ray fluorescence (EDXRF). The 23 studied elements were Na, Al, Si, Cl, Ti, Ba, V, Cr, Mn, Fe, Co, K, Ca, Ni, Cu, Zn, As, Pb, Rb, Sr, Y, Zr and Sn. A profile for average...

Determination of multi-element profiles of soil using energy dispersive X-ray fluorescence (EDXRF).

The source profile for soil in Hong Kong is important both for determination of the main air pollutant source in Hong Kong and for assessment of the impact of Asian dust storms on Hong Kong. Soil associated with different rock types have been sampled, and the concentrations of 19 chemical elements, Na, Al, Si, Ti, V, Cr, Mn, Fe, Co, K, Ca, Ni, Cu, Zn, Pb, Rb, Sr, Y and Zr, have been determined ...