Experimental Modern and Quantum Physics for Do-It-Yourself Science Enthusiasts 

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Home Experiments Archive for category "Compton Scattering"
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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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Open-Source Handheld Gamma Spectrometer on Yahoo Group GammaSpectrometry

An amateur-use open-source gamma spectrum analyzer is being developed by members of the GeigerCounterEnthusiast (GCE) Yahoo Group.  This multichannel analyzer (MCA) is based on the STM32F103VBT6 microcontroller.  It displays spectra on a color LCD. To access the design files (and hopefully to participate in the development) you will need to join the GammaSpectrometry Yahoo Group

 
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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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diy Low-Cost, Regulated, Variable, Low-Ripple High-Voltage (2kV) Photomultiplier Tube Power Supply

The book’s Figure 32 shows the schematic diagram for a low-cost, variable-voltage PMT power supply based on a BXA-12579 inverter module that is originally designed as a power supply for cold-cathode fluorescent lamps.  This under-$20 module produces 1,500VAC at around 30kHz from a 12VDC input. We are posting this picture to help you build your own power

 
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RCA 6655A PMT Data Sheet

This is the datasheet for the RCA 6655A PMT used in the probe shown in the book’s Figure 30: RCA_6655A_Datasheet This is the datasheet for Hamamatsu’s replacement of the RCA 6655A PMT: Hamamatsu replacement for RCA 6655A R2154-02 Schematic diagrams for the probe are in Figure 29.

 
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Assembly View of diy Variable-Output, High-Performance PMT High-Voltage Power Supply

We are posting this picture to help you construct the variable-output, low-ripple, high-stability, high-voltage power supply described in pages 38-40 of “Exploring Quantum Physics Through Hands-On Projects.”  The schematic diagrams for this power supply are in the book’s Figure 31.  Output voltage (up to 2 kV) and current (up to 1 mA) are monitored via

 
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Compton Scattering Experiment Using Spectrum Techniques’ Equipment

Spectrum Techniques of Oak Ridge, TN - a top supplier of Exempt Quantity radioisotope sources and nuclear measurement instrumentation – released today our tutorial: “Experiment Note: Exploring Compton Scattering Using the Spectrum Techniques Universal Computer Spectrometer”

 
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