A pulsed 931‐A photomultiplier and TW‐10 traveling wave oscilloscope have been used to measure the scintillation decay times of (a) transtilbene, (b) terphenyl‐in‐toluene, and (c) polystyrene plastic containing one percent terphenyl, 0.03% α‐NPO, and 0.01% zinc stearate. The times for 1/e decay are (a) 4±1×10−9 sec, (b) 2.2±0.3×10−9 sec, and (c) 2.2±0.3×10−9 sec. The behavior of the multiplier with large collector currents was studied, using a synchronized flash lamp. Linear currents up to 1.5 amperes and maximum currents up to 15 amperes were obtained. Currents in the ampere range can give rise to an oscillation which may limit the application of pulsed photomultipliers.

Topics
Oscilloscopes, Polymers, Luminescence, Photomultipliers, Laser lamp, Chemical compounds
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A more complete description of the decay time measurements is given by S. Singer, “Measurement of rise and decay times of three fast scintillators including a special plastic,” LASL Report 1694.
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The specific resistor values were chosen by letting Rn+1 = 1.2 Rn for n = 1,⋯,8; Rn+1 = 1.5 Rn for n = 9,10 (⁠n = 1 corresponds to the photocathode—1st dynode resistor).
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Since this work was carried out, further investigations of this effect was undertaken. It appears that the rms power developed during the “on” time of 0.25×10−6 sec is almost 0.5 megawatt, very nearly equal to the peak power put into the system (10 000 v at 55 amp). A further description of this investigation will be published.
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© 1956 The American Institute of Physics.
1956
The American Institute of Physics
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