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Selenium (Se) is # 34 on the Periodic Table of Elements. Elemental selenium is a nonmetal that varies in its appearance, from gray to red to black. Native selenium does occur, scarcely, as a mineral.
Thirty-five isotopes of selenium are known - seven occur naturally. About 50% of Se is selenium-80. About 24% is selenium-78. Selenium 74, selenium-76, selenium-77, and selenium-82 occur in minor to small amounts. Selenium-79 is radioactive and occurs in trace amounts only.
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Info. at:
en.wikipedia.org/wiki/Selenium
and
en.wikipedia.org/wiki/Isotopes_of_selenium
and
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Replaced selenium rectifier with diode. Oddly, there was what seemed to be a factory-installed dropping resistor (that was not on the schematic) in series already with the selenium . It was dropping the voltage down a bit too much with the original selenium, however when I replaced with the diode the voltages were right on spec. Happy accident I suppose.
I also later removed the clear insulation I put on the power resistors, as I found out that it doesn't take heat all that well.
Taken while having a little break from mountain biking to Fairlie.
The image toning has given it an IR look.
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2007
7" x 11"
Selenium-toned gelatin silver print
Available at: www.art-mine.com/artistpage/michael_howard.aspx