The signal supplied to the amplifier from the preamplifier (Sect. 6.4.5) in a nuclear spectroscopy system is usually a “tail” pulse (Fig. 7–1) with a 50- to 100-μsec tail time constant and a rise time of 20 to 100 nsec (to rise from 10 to 90% of top value). The amplitude of this pulse will be directly proportional to the energy of the nuclear event taking place in the detector since the preamplifier has a fixed gain.


Coupling Capacitor High Count Rate Noise Power Spectrum Common Mode Rejection Ratio Main Amplifier 
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References and Notes

  1. 1.
    K. F. Hatch, Analysis and description of a high stability nuclear pulse amplifier, IEEE Trans. Nucl. Sci., NS-13:351, 767 (1966). Description of the design and analysis of the nuclear pulse amplifier developed at Lawrence Radiation Laboratory, Livermore.ADSCrossRefGoogle Scholar
  2. 2.
    R. E. Bell, Comparison of leading-edge and crossover timing in coincidence measurements, Nucl. Instr. Meth. 42:211 (1966).CrossRefGoogle Scholar
  3. 3.
    R. L. Chase, Pulse timing systems for use with gamma rays on Ge(Li) detectors, Rev. Sci. Instr., 39:1318 (1968). A complete description of constant fraction timing.ADSCrossRefGoogle Scholar
  4. 4.
    K. F. Hatch, Aspects of resolution degradation in a nuclear pulse analyzer system, IEEE Trans. Nucl. Sci., NS-15:303 (1968). A discussion of the various problems at low and high rates that effect resolution.ADSCrossRefGoogle Scholar
  5. 5.
    V. Radeka, Effect of baseline restoration on signal-to-noise ratio in pulse amplitude measurements, Rev. Sci. Instr., 38:1397 (1967).ADSCrossRefGoogle Scholar
  6. 6.
    F. S. Goulding, Semiconductors for nuclear spectrometry. I, Nucl. Inst. Meth., 43:1 (1966). A complete description of the nuclear spectrometry system with emphasis on Ge(Li) detectors. A good basic section on pulse amplifiers and shaping is included.ADSCrossRefGoogle Scholar
  7. 6a.
    See also: E. Fairstein and J. Hahn, Nuclear pulse amplifiers—Fundamentals and design practice, Nucleonics, 23 (July, September, and November 1965); 24 (January and March 1966).Google Scholar

Copyright information

© Plenum Press, New York 1973

Authors and Affiliations

  • Kenneth F. Hatch
    • 1
    • 2
  1. 1.MITCambridgeUSA
  2. 2.Canberra IndustriesMeridenUSA

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