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Gemini-11 Experiment S-9 Nuclear Emulsion. This experiment will be used to study the cosmic radiation incident on Earth's atmosphere, to obtain detailed chemical composition of the heavy primary nuclei and to search for rare particles. Equipment is a rectangular package eight and a half by six by three inches weighing 15 pounds and including the nuclear emulsion film stack, motor to advance the emulsion and a timer to regulate the motor. The package is mounted atop the spacecraft retro adapter section prior to launch, is activated at insertion, and is retrieved by the EVA pilot. The experiment is conducted with the spacecraft in plus or minus 15 degrees of Earth's average magnetic field vector. Sponsors are NASA's Office of Space Science and Applications and the U.S. Naval Research Laboratories.