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Phase behavior Triple point: 289.8 K (16.7 °C), ? Pa Critical point: 593 K (320 °C), 57.8 bar Eutectic point with water –26.7 °C Std enthalpy change
[citation needed] Sheets of amorphous selenium convert X-ray images to patterns of charge in xeroradiography and in solid-state, flat-panel X-ray cameras. [91] Ionized selenium (Se+24, where 24 of the outer D, S and P orbitals are stripped away due to high input energies [ clarification needed ] ) is one of the active mediums used in X-ray lasers.
By 1901, it could detect radiation from a cow from 400 metres away and was sensitive to differences in temperature of one hundred thousandths (0.00001 C) of a degree Celsius. [ 47 ] [ 48 ] The first commercial thermal imaging camera was sold in 1965 for high voltage power line inspections.
The scale is an absolute temperature scale with the same increment as the Celsius temperature scale, which was originally defined according to the boiling point (set to 100 °C (212 °F)) and melting point (set to 0 °C (32 °F)) of water.
During the 1980s and early 1990s, Montreal experienced a slower rate of economic growth than many other major Canadian cities. Montreal was the site of the 1989 École Polytechnique massacre , one of Canada's worst mass shootings , where 25-year-old Marc Lépine shot and killed 14 people, all of them women, and wounded 14 other people before ...