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Not fucking good.  It looks like a power outtage destroyed a couple tubes or a preamp on my camera.  Luckily this camera has two heads but that means all the pictures until someone can get out here to fix it will take TWICE as long.  Gah!



Every morning I take a "flood" image on each of the heads of the camera.  These images are used to verify uniformity across the field of view of the camera.  This is what it SHOULD look like:



This is what one of the heads looked like this morning:



The way these cameras work is that there is a large, flat crystal that phosphoresces when hit by gamma rays.  Behind the crystal is an array of photomultiplier tubes that recieve the light energy and amp up the signal, while also mapping the point of light on a matrix.  In sequence with the tubes are amplifiers to increase the gain on the image according to preset energy tables(depending on what isotope you're imaging with and the energy of its photon).  Anyway, I either lost a couple tubes or an amplifier, by the looks of this image.  I hope the guy can get out here quick because the images are taking FOREVER!

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wlight
Aug. 1st, 2005 10:20 pm (UTC)
Behind the crystal is an array of photomultiplier tubes that recieve the light energy and amp up the signal, while also mapping the point of light on a matrix. In sequence with the tubes are amplifiers to increase the gain on the image according to preset energy tables(depending on what isotope you're imaging with and the energy of its photon).

Great, now you got me all hot and bothered.
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