| OCR Text |
Show Once venient . G was determined for scintillator geometr.y tt parison to the 'The voltage (DUmont The gain G of 6364, yield·a standard. number --o'f G VB. V :for a RCA 6342) of types was varied rn = of phct.ons 8.78; for the It , implied· .by is used on a f's were in m 8.28. ::; plot well With in all cases. throughout this experiment, single counter. Since for gain. A Fig. Al.2.· The points only one a pair of In order to achieve op timUm counter uniformity of response and minimum noise, it ble to match'them for selected to measured Pl·arees 'The pulse mean found that for the 2" tubes was the manufacturer's curves m.atching. and the Fast typical 6364 t,,-be is found PhotomultiE.lie photomul,tipliers is known to be phot()lllul tipliers used 5" 6364, how.ever, represet.empiricalrly.measured g;ains.· hat con- other tubes in om calibrte liquid scintillator measured; (6292 and 6342), more a Vm• DUmont a atandard" ), photomultiplter a V on ene each of the three ·6292, ·heght from k = used to was ff standard. ,. Gain !!. voltage. G on tube (the counter ... wa desira (Cl) were two tubes 'found with id-emtioal gain, for the other counters the photomul ti . 1'1ier bse circldt The circuit u$ed tor . Fig. Al.3. or tubs T2 is G2" capacity (Al.6) altered to was a Resistors;Rl and Tl nd T2. If the and desired pulse. to R2 are. gain for the two tubes. providet equal gain eoll.ctor-signal connection at ... is illutrated in in series with the base resistors R some voltage V of T1 is Gi' and of time constant is 'r, and the total collector ground is C, then we chose R1 and R2 such that |
