Pulse-height discriminator

Considerable confusion results because the terms pulse-height analysis, pulse-height discrimination, and pulse-height selection are sometimes used loosely or interchangeably. We shall follow The International Dictionary of Physics and Electronics, D. Van Nostrand Company, Inc., Princeton, N. J., 1950, pages 715 and 710, where the instruments for these techniques are described as follows ... 

Discrimination by adjustable path length in gas-flow Geiger Counters, 258 Discriminators, see Pulse-height discriminator Pulse-height selection Distribution of sample in spot test, 228 Divergence of x-ray beam in slit system, 111, 112... 

Additionally, some counting devices (pulse height discriminators) are designed to record signals at specified voltages and can measure one isotope in the presence of another. 

The intensity data, uncorrected for absorption, were measured on a fully automated Hilger-Watts diffractometer (Ni-filtered Cu-A"2 radiation, 0-20 scans pulse-height discrimination) using a crystal of dimensions ca. 0.08 x 0.20 x 0.6 mm grown from methanol. Of 1763 independent reflections for 0 < 57°, 1518 were considered to be observed [7> 2.5o(7)]. The structure and relative stereochemistry of... 

Beta particle calibration sources span energies from about 100 to 3,000 keV for proportional counters, and down to a few keV for liquid scintillation counters. In this experiment, a low-background, gas-flow, end-window proportional counter with automatic sample changer for alpha- and beta-particle counting is calibrated. Beta-particles sources are counted with pulse-height discrimination to eliminate interference from alpha particles the discriminator may be turned off when no alpha particles are present. 

What is the difference between the beta particle count rate with and without pulse-height discrimination ... 

Gas proportional counters have relatively good resolution, so the heights of current pulses can be analyzed and discriminated to eliminate pulses that appear due to Kp photons and due to low and high energy white radiation photons. The pulse height discrimination is often used in combination with a p-filter to improve the elimination of the Kp and white background photons. 

Diffractometer and spectrometer measurements Pulse-Height Discriminator... 

Fig. 7-21 Pulse-height discrimination and analysis. The statistical spread in pulse size, measured by the width W of Fig. 7-13, is suggested above by the variable heights of each pulse.

The distilled water is counted in an LS system at a selected water-to-cocktail ratio (usually 1 1). Samples may be counted without purification if other radionuclides are known to be absent or can be differentiated clearly from tritium by pulse-height discrimination in the detection system, and if chemicals that cause excessive quenching or fluorescence are known to be absent. Section 15.4.3 illustrates an extension of this measurement technique, where is measured in flowing water with a scintillation counter. 

The distinction between a second event that only adds to the pulse height of the first event or is counted separately is a function of pulse height discrimination and random pulse arrival time, as shown in Fig. 8.1. Further distinctive behavior, also shown in the figure, is a second event that is counted although the first pulse has not completely died away, i.e., the second pulse has some contribution from... 

Wide-angle x-ray diffraction (WAXD) measurements were performed with a Rigaku x-ray diffractometer in the transmission mode. CuKo radiation was obtained by using a Ni-filter and detected by a scintillation counter and a pulse height discriminator. For the scan over 2 0 = 5° to 130, the background of the empty beam was subtracted from the measured intensity. 

A basic radiation measuring system consists of the detector, a high-voltage power supply for bias voltage, a preamplifier, and a power supply for the preamplifier and signal amplifier. A pulse height discriminator is used to decrease the low-energy noise from the detector and the amplifier. 

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