C.R.O.P. at Mount Michael

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C.R.O.P. at Mount Michael
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Jamie AntonelliSean MahoneyDerek StreichFr.
Michael Liebl
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Mount Michael Benedictine High School
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Cosmic Ray Experiments

• Setting the Threshold Voltages of the Detectors
• Count Rate as a Function of Atmospheric Pressure
• Count Rate as a Function of Time of Day
• Count Rate as a Function of Separation of Counters

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Setting the Threshold Voltage

• High voltage to PMT 1350 V.
• Counts recorded for each detector separately for
  five minutes.
• Look for the change in slope of the log(count
  rate) versus threshold voltage.
• One PMT bites the dust.

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While measuring voltage to PMT, large ground lead
from voltmeter touches both terminals, shorts out
PMT on Detector D.
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PMT and panel ready for threshold measurement.
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