An experimental physicist who contributed to the 1962 rocket experiment reported with Riccardo Giacconi, Herbert Gursky and Bruno Benedetto Rossi. The payload used large-area Geiger counters with thin mica windows to detect soft X-rays; surrounding scintillation counters rejected charged-particle background. As the rocket rotated, the detectors scanned the sky and found a strong directional excess. The result supplied early evidence for X-ray sources outside the Solar system.[ref]
Evidence for x Rays From Sources Outside the Solar System by Riccardo Giacconi and others. Printed pp. 439–440: detector windows, anticoincidence shielding, sky scan and count-rate peak
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