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Home Instrumentation Archive for category "PMT/Scintillation Processor"
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Using the $79 SainSmart DSO201 Pocket Oscilloscope and GammaGrapher with the PMT/Scintillation Probe

Connects directly to PMT probe shown in the book’s Figure 30 with no need for PMT amplifier!   The nice guys at the Yahoo GammaSpectrometry Group developed multichannel analyzer software for the $79 SainSmart DSO201 Pocket-Sized Digital Oscilloscope.  The upload of the MCA software to the oscilloscope is really easy (via USB), and it allows the PMT probe shown in

 
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Simple d.i.y. Bias-T for Scintillation Probes with Single Connector

Many surplus scintillation probes have a single connector through which the PMT is fed with high voltage and the anode signal is output.  However, this may require an external “Bias-T” (a high voltage / signal splitter) to connect the probe to a high-voltage power supply that is separate from the PMT amplifier/processor.

 
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Simple d.i.y. Low-Pass Filter for Interfacing PMT Amplifier to PC Sound Card (Used with Free “Pulse Recorder and Analyser” Software MCA)

Figure 34 in the book shows the schematic diagram for our photomultiplier tube (PMT) signal processing circuit has an analog output that is suitable for use with a sound-card-based multichannel pulse-height analyzer (MCA).  However, if you already have a commercial scintillation processor that you would like to use with PRA, then you will somehow need to

 
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Converting a DT-590A/PDR-56F “X-Ray” Probe into a General-Purpose NaI(Tl) Gamma Probe

The military Radiac Set, AN/PDR-56 is a portable scintillation type instrument used for detection of alpha contamination. The system includes a large and small interchangeable probe with a probe extension.  This system is being phased out by the US Air Force, so new probes are becoming widely available in the surplus market. The “x-ray” probe

 
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d.i.y. Handheld Multichannel Analyzer (MCA) based on 16F877 PIC Microcontroller and LCD

Some time ago I was developing a medical instrument which required histogramming, which got me in the mood to retake my own PIC MCA project(http://home.comcast.net/~prutchi/index_files/scint.htm ).   I used the variable RAM in the microcontroller (16F877), so I limited the number of channels to 95 and let the histogram run until some channel reaches 240 counts (the

 
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Prototyping PCB for d.i.y. Photomultiplier (PMT) Amplifier/Processor

We built the bulk of our PMT amplifier/processor/discriminator on a Universal PDIP Operational Amplifier Evaluation Module by Texas Instruments (model OPAMPEVM-PDIP).  Click on the picture above for a full-size version of the picture. The diagram in the following pdf file shows the connection layout for the circuit shown in the book’s Figure 34: PMT Processor PCB 

 
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diy PMT Pulse Processor Suitable For Use With “Pulse Recorder and Analyser (PRA)” MCA

Figure 34 in the book shows the schematic diagram for the photomultiplier tube (PMT) signal processing circuit that amplifies the narrow pulses detected by the PMT probe.  The discriminator stage removes small pulses produced by thermal noise in the tube.  A pulse stretcher outputs pulses that can be heard on a speaker.  In addition, the analog

 
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