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ATM, Event Analyzer, X-Ray


Display Status:

This object is on display in the James S. McDonnell Space Hangar room at Steven F. Udvar-Hazy Center in Chantilly, VA.

ATM, Event Analyzer, X-Ray

Collection Item Summary:

Engineering prototype for an event analyzer that formed part of the assembly of one (S056; Cat #19840408000) of the three X-ray telescopes that were flown on the Apollo Telescope Mount (ATM)on Skylab. This analyzer (X-REA), built by James E. Milligan and his staff at Marshall, comprises a proportional counter system with beryllium and aluminum windows. The instrument, which contained its own amplifier and preamplifier, also included a pulse height analyzer, rate meter and activity history plotter. It was transferred to NASM from NASA's Marshall Space Flight Center in 1986.

Collection Item Long Description:

Data Source

National Air and Space Museum


Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum

Credit Line

Transferred from NASA/Marshall Space Flight Center


  • Metal case, electronics, wires
  • Electronics


3-D: 76.2 x 16.5 x 14cm (30 x 6 1/2 x 5 1/2 in.)

Country of Origin

United States of America



Inventory Number