SPI Supplies Brand Chromium Evaporated on 3 mm Gold Grid

The SPI Supplies^® Brand Chromium Evaporated on Gold Grid consists of a uniform layer of chromium evaporated onto a Formvar™ coated gold grid. The EDS spectrum from a grid bar shows characteristic x-ray spectra for both chromium and gold (Figure 1). The EDS spectrum from the center of a grid square will show only the characteristic spectrum of chromium (Figure 2) unless stray radiation and/or electrons are exciting the grid bars. In quantitative EDS protocols, this specimen can be used to assure that the operating conditions of the analytical electron microscope do not include stray radiation and/or electrons. Who should consider purchasing this instrument performance standard? Anyone contemplating the conduct of any quantitative TEM work.