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textbook:nrctextbook:chapter8 [2025-09-01 13:10]
Merja Herzig 		textbook:nrctextbook:chapter8 [2025-09-01 13:46] (current)
Merja Herzig
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-{{:textbook:nrctextbook:effect_of_counting_geometry_on_radiation_detection_of_a_point_source_n.png?200 |}}+{{:textbook:nrctextbook:effect_of_counting_geometry_on_radiation_detection_of_a_point_source_light.png?200 |}}
 Figure VIII.1. Effect of counting geometry on radiation detection of a point source. Figure VIII.1. Effect of counting geometry on radiation detection of a point source.
  
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   * A single channel analyzer (SCA) counts only pulses at a defined height range. As described above, selection of pulse height range is accomplished with voltage discriminators, lower and upper. In addition, there is a pulse counter that sums all pulses coming to the discriminator window. For example, single channel can be set to count only pulses with heights between 50 mV and 150 mV, i.e. pulses that would go channels 50-150 in the multichannel analyzer, presuming same settings. Single-channel analyzer is used to measure only one [[textbook:nrctextbook:chapter4|radionuclide]] at the time. The discriminators are set by measuring the spectrum of the desired radionuclide by using a narrow discriminator window at increasing mV range. Plotting the counts at increasing mV results in the formation of an energy spectrum. The measurement window is set by measuring the spectrum of the desired radionuclide and selecting from the spectrum the lower and upper discriminator voltage values so that the pulses from the [[textbook:nrctextbook:chapter9#photopeak|photopeak]] is between them. Single channel mode is typically used in gamma counters with [[textbook:nrctextbook:chapter9#solid_scintillators|solid scintillation detectors]].   * A single channel analyzer (SCA) counts only pulses at a defined height range. As described above, selection of pulse height range is accomplished with voltage discriminators, lower and upper. In addition, there is a pulse counter that sums all pulses coming to the discriminator window. For example, single channel can be set to count only pulses with heights between 50 mV and 150 mV, i.e. pulses that would go channels 50-150 in the multichannel analyzer, presuming same settings. Single-channel analyzer is used to measure only one [[textbook:nrctextbook:chapter4|radionuclide]] at the time. The discriminators are set by measuring the spectrum of the desired radionuclide by using a narrow discriminator window at increasing mV range. Plotting the counts at increasing mV results in the formation of an energy spectrum. The measurement window is set by measuring the spectrum of the desired radionuclide and selecting from the spectrum the lower and upper discriminator voltage values so that the pulses from the [[textbook:nrctextbook:chapter9#photopeak|photopeak]] is between them. Single channel mode is typically used in gamma counters with [[textbook:nrctextbook:chapter9#solid_scintillators|solid scintillation detectors]].
  
-{{:textbook:nrctextbook:components_and_scheme_of_radiation_measurement_equipment_systems_fig_8_4.png|}}+{{:textbook:nrctextbook:components_and_scheme_of_radiation_measurement_equipment_systems.png|}}
  
 Figure VIII.4. Components and scheme of radiation measurement equipment systems. PMT is [[textbook:nrctextbook:chapter9#photomultiplier_tube|photomultiplier tube]]. Figure VIII.4. Components and scheme of radiation measurement equipment systems. PMT is [[textbook:nrctextbook:chapter9#photomultiplier_tube|photomultiplier tube]].
textbook/nrctextbook/chapter8.1756725003.txt.gz · Last modified: 2025-09-01 13:10 by Merja Herzig

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