June, 6, 2007 Scintillator Signals from source

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Today Oleksiy, Tamuna, and Tony looked at the scintillator response to a californium neutron source. There were used two types of PMTs and scintillators. PMTs were (i) ORTEC 266 and (ii) PHOTONIS VD 119. In case of (i) it was applied voltage 700 V, I=500 uA. In case (ii) the voltage 1200 V was applied, I=800 uA.

The Cf-252 was placed first at the distance ~0 cm to the front edge of scintillators. (i) Signal amplitude was ~8 mV at the threshold set on the oscilloscope 2.4 mV. (ii) Signal amplitude was ~20 mV.

In the case the distance between Cf-252 and scintillators was ~3 m we had only cosmic rays events in both channels.

Material of scintillator used in case (i) was BC-420.

To be continued...

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