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Apparatus for reducing pulse pileup in an elemental analyzer measuring gamma rays arising from neutron capture in bulk substances

  • US 4,152,596 A
  • Filed: 07/05/1977
  • Issued: 05/01/1979
  • Est. Priority Date: 07/05/1977
  • Status: Expired due to Term
First Claim
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1. In an apparatus for the on-line analysis of the composition of a bulk substance, wherein said analysis includes the production and capture of neutrons and the detection and measurement of the energy spectrum of the resulting capture gamma rays, an improvement for reducing the deleterious effects of pulse pileup, the improvement comprising, in combination:

  • (a) a gamma-ray detector operably associated with the bulk substance which is exposed to neutrons to generate capture gamma rays, the detector producing electrical signals indicative of the energies of the gamma rays to provide for the measurement of their energy spectrum;

    (b) slow-amplifier means connected to the output of the gamma-ray detector, the slow-amplifier means producing a pulse of sufficient width that satisfactory resolution can be obtained in the energy-spectrum measurement;

    (c) fast-amplifier means also connected to the output of the gamma-ray detector, the fast-amplifier means producing a pulse with a width chosen to optimize the detection of pulse pileup; and

    (d) amplitude-correlation means connected to the outputs of the slow-amplifier means and of the fast-amplifier means, the amplitude-correlation means detecting an event where the amplitude of the pulse produced by the slow-amplifier means is inconsistent with the amplitude of the pulse produced by the fast-amplifier means,whereby events with pulse amplitudes which pileup has distorted can be eliminated from the measurement of the energy spectrum of the capture gamma rays.

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