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Category Archives: Compton Scattering

Using the $79 SainSmart DSO201 Pocket Oscilloscope and GammaGrapher with the PMT/Scintillation Probe

Posted on September 21, 2012 by David Prutchi Posted in Chapter 2 - Light as Particles, Chapter 3 - Atoms and Radioactvity, Chapter 5 - Wave-Particle Duality, Compton Scattering, MCA/PHA, Photomultipliers, PMT/Scintillation Processor, Scintillation Detector, Single-Photon Experiments

Connects directly to PMT probe shown in the book’s Figure 30 with no need for PMT amplifier!

 

Freeware Gamma Grapher MCA with diy PMT Scintillation Probe by David and Shanni Prutchi diyPhysics.com

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 the book’s Figure 30 to be connected directly to the oscilloscope’s input with no need for a PMT amplifier!

Continue reading→

Open-Source Handheld Gamma Spectrometer on Yahoo Group GammaSpectrometry

Posted on February 1, 2012 by David Prutchi Posted in Chapter 3 - Atoms and Radioactvity, Chapter 5 - Wave-Particle Duality, Compton Scattering, Ionizing Radiation Detection, MCA/PHA, Radio-Isotope Identification, Scintillation Detector

GammaGrapher Open-Source MCA developed by members of Yahoo Group GCE

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 (free membership).  Join through: http://groups.yahoo.com/ Continue reading→

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

Posted on January 31, 2012 by David Prutchi Posted in Chapter 2 - Light as Particles, Chapter 3 - Atoms and Radioactvity, Chapter 7 - Schrödinger's Wave Equation, Compton Scattering, Ionizing Radiation Detection, Photomultipliers, PMT/Scintillation Processor, Scintillation Detector, Single-Photon Experiments

Printed circuit board for diy PMT amplifier, processor, discriminator and scintillator detector

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  Continue reading→

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

Posted on January 20, 2012 by David Prutchi Posted in Chapter 2 - Light as Particles, Chapter 5 - Wave-Particle Duality, Compton Scattering, Ionizing Radiation Detection, MCA/PHA, Photomultipliers, PMT/Scintillation Processor, Scintillation Detector, Single-Photon Experiments 2 Comments

diy Photomultiplier Processor

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 output is suitable for use with a sound-card-based multichannel pulse-height analyzer (MCA). Continue reading→

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

Posted on January 20, 2012 by David Prutchi Posted in Chapter 2 - Light as Particles, Chapter 3 - Atoms and Radioactvity, Chapter 5 - Wave-Particle Duality, Compton Scattering, High-Voltage Power Supply, Ionizing Radiation Detection, MCA/PHA, Photomultipliers, Scintillation Detector, Single-Photon Experiments

diy Low-cost, regulated, variable-output photomultiplier 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 supply.  It shows the BXA-12579 that has been modified as described in the book.   The op-amp to the right of the CCFL module is used to control the voltage supplied to the module.  The high-voltage AC output of the inverter is rectified and doubled and filtered by the diodes and capacitors at the left of the CCFL module. Continue reading→

RCA 6655A PMT Data Sheet

Posted on January 14, 2012 by David Prutchi Posted in Chapter 2 - Light as Particles, Chapter 3 - Atoms and Radioactvity, Chapter 5 - Wave-Particle Duality, Chapter 7 - Schrödinger's Wave Equation, Compton Scattering, Ionizing Radiation Detection, Photomultipliers, Scintillation Detector

RCA 6655A photomultiplier tube

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.

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

Posted on January 14, 2012 by David Prutchi Posted in Chapter 2 - Light as Particles, Chapter 3 - Atoms and Radioactvity, Chapter 5 - Wave-Particle Duality, Chapter 7 - Schrödinger's Wave Equation, Compton Scattering, High-Voltage Power Supply, Ionizing Radiation Detection, MCA/PHA, Photomultipliers, Single-Photon Experiments

Variable-output, low-ripple, high-stability, high-voltage power supply described in pages 38-40 of "Exploring Quantum Physics Through Hands-On Projects."

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 two LCD panel meters. Continue reading→

Compton Scattering Experiment Using Spectrum Techniques’ Equipment

Posted on January 13, 2012 by David Prutchi Posted in Chapter 5 - Wave-Particle Duality, Compton Scattering, Ionizing Radiation Detection, MCA/PHA, Scintillation Detector

Observing Compton Scattering Using the Spectrum Techniques UCS-20 MCA

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” Continue reading→

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