A cold electron source has been developed using a microchannel plate (MCP) electron multiplier. Primary electron emission is initiated by illumination with ultraviolet photons from a diode. Final electron emission currents of up to 10 μA in continuous wave (CW) mode and 10 mA in pulsed mode have been achieved from a MCP with an active diameter of 5.5 mm. Electron emission generated by UV photons with a wavelength of 260 nm has been shown to be about 30 times more efficient than emission generated by photons with a wavelength of 300 nm. Application of this cold electron source in mass spectrometry is discussed.
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In vitro comparison of the marginal adaptation of cold ceramic sealer with the single-cone obturation technique versus AH-26 sealer with the lateral compaction technique in single-canal teeth.
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