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

Facebook Flickr LinkedIn YouTube RSS
magnify
Home Book Chapters Archive for category "Chapter 3 – Atoms and Radioactvity" (Page 2)
formats

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

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
1 Comment  comments 
formats

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 

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
Comments Off on Prototyping PCB for d.i.y. Photomultiplier (PMT) Amplifier/Processor  comments 
formats

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

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
Comments Off on diy Low-Cost, Regulated, Variable, Low-Ripple High-Voltage (2kV) Photomultiplier Tube Power Supply  comments 
formats

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.

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
Comments Off on RCA 6655A PMT Data Sheet  comments 
formats

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

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
Comments Off on Assembly View of diy Variable-Output, High-Performance PMT High-Voltage Power Supply  comments 
formats

β-Particle Magnetic Deflection Experiment – Supplementary Pictures

The book’s Figure 65 shows our β-particle magnetic deflection setup.  It consists of a 90Sr disc source of beta particles, two copper washers to collimate the beam, and GM tubes placed at 0º and 90º to the β-particle beam. A sufficiently strong magnetic field (around 800 Gauss = 0.08 Tesla) provided by a permanent magnet bends the beam

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
Comments Off on β-Particle Magnetic Deflection Experiment – Supplementary Pictures  comments 
formats

Attenuation of Alpha, Beta and Gamma Radiation in Air

  The attenuation of radiation as a function of distance can be measured using a radiation counter with a Geiger-Müller tube that is sensitive to α, β, and γ radiation.  We used exempt plastic-disc sources containing Polonium 210 (210Po), Strontium 90 (90Sr), and Cobalt 60 (60Co) to experiment with the penetrating power of α, β,

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
Comments Off on Attenuation of Alpha, Beta and Gamma Radiation in Air  comments 
formats

diy Measurement of the Charge-to-Mass Ratio of the Electron Using “Magic Eye” Tube – Supplementary Pictures

Figure 54 in the book shows our setup based on a 6AF6-G “magic eye” tuning tube to measure e/m.  The pictures in this figure supplement the book’s Figure 54 to help you build your own system.   In the 6AF6, electrons produced by a thermionic cathode cause fluorescence on the tube’s anode. Applying an external magnetic field curves

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
Comments Off on diy Measurement of the Charge-to-Mass Ratio of the Electron Using “Magic Eye” Tube – Supplementary Pictures  comments 
formats

d.i.y. Measurement of Electron’s Charge-to-Mass Ratio Through Hoag’s Method – Supplemental Pictures

Figures 51 and 52 in the book show how to use an oscilloscope 2AP1 CRT to measure e/m using Hoag’s method.  The pictures in this figure supplement the book’s, showing you how to construct the d.i.y. setup, as well as the way in which the electron beam fan is reduced to a point as the magnetic

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
Comments Off on d.i.y. Measurement of Electron’s Charge-to-Mass Ratio Through Hoag’s Method – Supplemental Pictures  comments 
formats

d.i.y. Maltese Cross Cathode Ray Tube – Supplementary Picture

This is a supplementary picture to the book’s Figure 43.  It shows our d.i.y. “Maltese Cross” CRT connected to the vacuum system and high-voltage power supply.  Please note that the HV power supply is configured to produce a negative output referenced to ground.  The anode and target electrode are at ground potential.  The cathode rod

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
Comments Off on d.i.y. Maltese Cross Cathode Ray Tube – Supplementary Picture  comments 
formats

d.i.y. Glow Discharge Tube Diagnostics – Supplementary Figure

This figure supplements the book’s Figure 42.  The book’s figure describes the features that appear in the glow discharge.  However, we felt that a color picture is required as a cross-check to help you correctly set up your own system.

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
Comments Off on d.i.y. Glow Discharge Tube Diagnostics – Supplementary Figure  comments 
formats

Pictorial Instructions for Modifying ENI CD V700 into CDV700 Pro

We modified a surplus Civil Defense V-700 radiation survey meter made by Electro Neutronics Inc. (Model 6-b) into a very capable radiation counter capable of working with both Geiger-Müller and PMT scintillation probes. We modified the front panel to accommodate the new switches, connectors, and panel light. In addition, we placed a Veeder-Root count totalizer

 
 Share on Facebook Share on Twitter Share on Reddit Share on LinkedIn
2 Comments  comments