All 3 detectors working

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Detector A: High Voltage = 1900V; Threshold = 5mV

Detector C: High Voltage = 1860V; Threshold = 10mV

Detector D: High Voltage = 1950V; Threshold = 5mV

Note: Really high background in the experimental cell, so more shielding was added: i.e. paraffin wax.

Experimental cell setup after adding addition shielding:

Apparatus October 2008.JPG

Graph before shielding:

The number of counts for the gamma flash (Channels 2000-2500) = 818

The number of counts for the neutrons (Channels 2500-4096) = 256

Taking the ratio [math]\frac{gamma}{neutrons}[/math] gives 3.19

Before shielding.JPG


Graph after shielding:

The number of counts for the gamma flash (Channels 2000-2500) = 1127

The number of counts for the neutrons (Channels 2500-4096) = 187

Taking the ratio [math] \frac{gamma}{neutrons} [/math] gives 6.03

After shielding.JPG

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