EP-95 ON THE MOON WITH APOLLO 16

FIGURE 65.-X-ray Fluorescence Equipment.

FIGURE 65.-X-ray Fluorescence Equipment. The collimator is a grid of tubes that restricts the viewing angle of the proportional counter; it is necessary in order to view small area (say a few square miles) of the Moon's surface at any particular time. The proportional counter provides an electrical voltage proportional to the energy of incident X-rays. It uses a mixture of the gases argon, carbon dioxide, and helium. The electronics package which is used to process the signals for radio transmission to the Earth is not shown in this figure.

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