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To prepare for a radiation measurement test in space, I had to prepare a Geiger Counter measurement data logging system. This video demonstrates the testing I had to do, mainly temperature and vacuum tests. In the vacuum test, at the end you'll see the LED light up non-stop. Normally, air provides an electrical resistance to prevent electrons jumps across circuit board traces. However, the Geiger counter employs very high voltages, and the vacuum chamber removed most of the air. As such, electrical shorts formed due to electron jumping. To resolve the issue, hot glue was applied across the circuit board to provide insulate. The glue had no issues for three separate space flights. I will put up more information in written form on my website later,