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Summary of Contents for ORTEC 276
- Page 1 Model 276 Photomultiplier Base Operating and Service Manual ® Printed in U.S.A. ORTEC Part No. 733130 0405 Manual Revision D...
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Page 2: Warranty
In the event ORTEC fails to manufacture or deliver items called for in this agreement or purchase order, ORTEC’s exclusive liability and buyer’s exclusive remedy shall be... -
Page 3: Table Of Contents
CONTENTS WARRANTY ................ii SAFETY INSTRUCTIONS AND SYMBOLS . -
Page 4: Safety Instructions And Symbols
SAFETY INSTRUCTIONS AND SYMBOLS This manual contains up to three levels of safety instructions that must be observed in order to avoid personal injury and/or damage to equipment or other property. These are: DANGER Indicates a hazard that could result in death or serious bodily harm if the safety instruction is not observed. -
Page 5: Safety Warnings And Cleaning Instructions
SAFETY WARNINGS AND CLEANING INSTRUCTIONS DANGER Opening the cover of this instrument is likely to expose dangerous voltages. Disconnect the instrument from all voltage sources while it is being opened. WARNING Using this instrument in a manner not specified by the manufacturer may impair the protection provided by the instrument. -
Page 7: Description
ORTEC MODEL 276 PHOTOMULTIPLIER BASE 1. DESCRIPTION The ORTEC 276 Photomultiplier Base is designed RCA: 4518, 5819, 6217, 6342A, 6655A, 7326, to provide a near-optimum voltage distribution for 8053, 8054, and 8055 essentially all 10-stage photomultiplier tubes that fit the standard 14-pin tube socket. The unit has a self... -
Page 8: Output
Dimensions 5.58 cm (2.2 in.) diam × 10.1 cm (4.0 in.) long plus 3-m (10 ft) captive power cable. TEST Type BNC connector on panel accepts test pulses from an ORTEC Pulse Generator for testing and calibration. Nominal 100- charge termination built into preamplifier circuit. -
Page 9: Operation
4. OPERATION Once the steps outlined in Section 3 of this manual The thickness of the scintillator is frequently chosen are performed, the unit is ready for use. High according to the required stopping power. The flight voltage may be applied and adjusted for the time of the radiation (gamma rays or neutrons) appropriate gain associated with the specific across the scintillator normally becomes a limitation... - Page 10 If the output charge is integrated on a capacitor as Example: it is on this unit, the capacitor voltage becomes: P h o t o m u l t i p l i e r : R C A - 8 0 5 5 , S - 1 1 photocathode, gain 1 ×...
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Page 11: Timing Applications
0.28 mA × 50 = 14 mV. In the fast channel the timing amplifiers indicated may be the ORTEC 474 or equivalent or may be a 4.2. TIMING APPLICATIONS combination of fast amplifier/fast discriminator such The different specific applications for the unit are... -
Page 12: Gamma-Gamma Coincidence System For The High-Purity
Figure 4.2 outlines a simple conventional crossover it results in a 2 coincidence resolving time which is pick-off coincidence system, which is probably the theoretically worse by a factor of ~12 than may be easiest and most versatile method of doing achieved by leading-edge timing such as was coincidence when the ultimate resolving time is not indicated in Fig. -
Page 13: Maintenance
Fig. 4.3. Gamma-Gamma Coincidence System Using HPGe Detectors. Fig. 4.4. Scintillation Spectrometry System. 5. MAINTENANCE The resistor divider string of this unit is composed comparative purposes. Almost all failures of the only of passive components; so the only dynode string may be isolated by removing the PM maintenance to be expected is replacement of tube and making these measurements. -
Page 14: Factory Repair
Q1–Q4 should be very high 5.1. FACTORY REPAIR gain ( or hfe) low-noise NPN transistors. R19, This instrument can be returned to the ORTEC R23, and R24 should be of precision metal film for factory for service and repair at a nominal cost. Our low noise and good stability. -
Page 15: Bibliography
Table 5.2. Preamplifier Voltages. 6. BIBLIOGRAPHY 1. P.R. Orman, Nucl. Instr. Methods 21(1), 121 (1963). 13. C.R. Kerns, IEEE Trans. Nucl. Sci. NS-14(1), 2. D.L. Wieber and H.W. Lefevre, IEEE Trans. 449 (1967). Nucl. Sci. NS-13(1), 406 (1966). 14. M. Cocchi and A Rota, Nucl. Instr. Methods 3. - Page 16 C.W. Williams, “High Nucl. Instr. Methods 31(1), 112 (1964), and Resolution Time Spectroscopy. 1. Scintillation references contained therein. Detectors,” ORTEC Publication August 1968. 32. D. Landis and F.S. Goudling, Nat. Acad. Sci. – 37. RCA Photocathode Spectral Response Nat. Res. Council Publ. 1184, 143 (1963).
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