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<p>particle detector systems. One system, containing two sensors, detected the <a href="page.php?w=energy_spectra">energy spectra</a> of the <a href="page.php?w=alpha_particle">alpha particle</a>s scattered from the lunar surface, and the other, containing four sensors, detected energy spectra of the <a href="page.php?w=proton">proton</a>s produced via reaction (alpha and proton) in the surface material. Each detector assembly was connected to a <a href="page.php?w=pulse_height_analyzer">pulse height analyzer</a>. A digital electronics package,</p><p>
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