Gamma and X-Ray Detection

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detectors (such as proportional counters and NaI(Tl) detectors) are used in x ray or lowenergygamma ray applications where only a few peaks occur. An example of a simpleNaI(Tl) detector-based counting system of this type is illustrated in Figure 1.16.Figure 1.16: NaI Detector and Counter/Timer with Alarm RatemeterIn this configuration, a Model 2015A Amplifier/SCA is used to generate a logic pulse forevery amplified (detector) pulse that falls within the SCA’s "energy window". The logicpulse is then used as an input to the Model 2071A Counter/Timer which provides theuser with a choice of either preset time or preset count operation. The Model 2071Amay be equipped with an optional Model 207X-03 EIA Interface, which enables theModel 2071A to be read out to a printer, or controlled and read out to a computer fordata storage or further analysis.Alternatively, Model 1481LA Linear/Log Ratemeter is used as the counter, with an alarmrelay that will trigger if the count rate exceeds a user preset value.Although counters are still used in some applications, most of today’s counting systemsinclude a multichannel analyzer (MCA). Besides being more cost effective than multipleSCA-based systems, a MCA-based system can provide complete pulse height analysissuch that all nuclides, (i.e., even those not expected), can be easily viewed and/oranalyzed.NaI(Tl)Detectors and Multichannel AnalyzersThe need for a single-input Pulse Height Analysis with Sodium Iodide detector is bestserved by a PC-card MCA, such as the AccuSpec NaI/Plus (Figure 1.17).Figure 1.17: AccuSpec/NaI Plus MCA ConfigurationGamma Ray Dectection - An Overview - CAMBERRA 14
This single plug-in board includes a High Voltage Power supply, Amplifier, and ADC inaddition to its MCA functions, and thus, there is no need for additional modules or a NIMBin. Further technical discussions concerning multichannel analyzers and multichannelanalysis systems (including spectroscopy software) may be found in MultichannelAnalyzers and Advanced Spectroscopy Software sections.PIPS Detectors and Multichannel AnalyzersAlpha spectroscopy measurements of low-level samples require long counting times. Alarge area PIPS detector, when configured with a Canberra alpha spectrometer andmultichannel analyzer, provides a high resolution, low background, counting system thatwill satisfy a multitude of alpha spectroscopy applications.Figure 1.18 Example Large Scale Alpha Spectroscopy SystemGamma Ray Dectection - An Overview - CAMBERRA 15
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Gamma and X-Ray Detection

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