The HRC accurately records the position, number, and energy of X-rays. The camera consists of two clusters of 69 x 106 lead oxide (PbO2) glass tubes, 1.2 mm long and 10m in diameter (1/8th the diameter of a human hair.) The X-rays strike the tubes and release electrons that are accelerated down the tubes at high voltage. The electrons trigger the release of other electrons, and at the end of the tubes millions of electrons strike a grid and produce a finely detailed map of the source which emitted the X-rays.

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Slide 14 of 28