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

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New Isotope/Geiger Tube Holder at Images Scientific

Images Scientific Corporation just announced a new Geiger counter wand base provides a stable platform to hold the Geiger counter wand for experiments. The physical dimensions of the holder are 2″ wide by 12″ long. The length of the sled has markings in both metric and imperial. The sled isotope holder provides a stable and moveable

 
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Perkin Elmer C30902E SPADs on eBay for $91 (Unrelated to Authors)

Someone (I don’t know the seller) is selling brand new Perkin Elmer C30902E Silicon Avalanche Photodiodes on eBay.  Auction number:  200747161278. These are NOT chilled by a thermoelectric cooler, so their internal noise may be too large for experiments with entangled photons unless you rig some sort of external Peltier element to keep them chilled.  However,

 
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Is That Girl With the Green Hair Talking About Quantum Physics?

We had a very nice book presentation and discussion last night at Barnes & Noble in Marlton, NJ.  Quite a few curious shoppers stopped by while Shanni presented a lecture on diy Quantum Physics.  Thanks to our very few, but very loyal fans  🙂

 
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Lecture on “Do It Yourself Quantum Physics” and Book Signing at Barnes & Noble this Tuesday

We have been invited by Barnes & Noble in Marlton Circle to their Educator’s Night to lecture on “Do It Yourself Quantum Physics”: Educator Event Teachers are invited to meet authors David Prutchi and Shanni Prutchi for a “Do-It-Yourself Quantum Physics” night! Book Talks, thank-you bags, fun and door prizes also. CEUs available for attendance from 6:30 to

 
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Telling Apart 365 nm from 395 nm Ultraviolet LEDs and Flashlights

Today I received an UltraFire WF-502B UV flashlight advertised as emitting at 365 nm.  I was wondering how to tell if it really does, especially since vendors commonly list it as emitting 365-400 nm. Well, I was in Canada last week, and had $25 Canadian left over in my wallet, so I tried this flashlight and compared it to

 
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No Joke: Science Is A Laughing Matter – NPR’s Science Friday April 1st Edition

  Yesterday, Friday, March 30th, 2012, NPR’s Science Friday had its yearly April 1st “No Joke: Science Is A Laughing Matter” program.  Want to hear a joke about sodium hypobromite? NaBrO! Can science be the butt of a good joke? Ira Flatow and guests test the hypothesis in an annual April Fools’ joke-a-thon. They share

 
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Testing Electronic Goldmine’s “Giant Super Sensitive Geiger Muller Tube MC6”

I purchased two “Giant Super Sensitive MC6” GM tubes from Electronic Goldmine (Item Number : G18717, Unit Price: $89.95).  These are Russian-made new-old-stock model MC6.  They are 10.25″ long x 0.9″ diameter.  I compared the sensitivity of these tubes to the other GM tubes that I use with my CDV700 Pro Geiger Counter.

 
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Tom Van Baak’s Family-Friendly Relativistic Time-Dilation Experiment

I was going through my e-mails for some information on atomic frequency standards, when I came across an e-mail that I had sent to Tom Van Baak in 2007 congratulating him for his family-friendly time dilation experiment.  If you are not familiar with his work,  I heartily recommend that you explore his precision-time-keeping webpage at LeapSecond.com.

 
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d.i.y. Alpha-Particle Rutherford Scattering Experiment – Supplementary Pictures

The book’s Figures 70 and 71 show our d.i.y. version of a popular apparatus to measure alpha particle scattering.  The figure above shows additional views to help you build your own.  The apparatus allows you to demonstrate alpha particle scattering discovered by Ernest Rutherford in 1908.  Fundamental to the discovery of the atom’s structure, the experiment

 
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Connecting to Surplus Scionix Miniature Scintillation Probes

Scionix in The Netherlands has taken advantage of the recent development of miniature mesh-type dynode photomultiplier tubes to construct small-diameter scintillation probes.  Scionix’s miniature probes incorporate one of those PMTs, a NaI(Tl) scintillation crystal, and a built-in dynode voltage divider.  Connection to the probe is made through a miniature high-voltage locking coaxial connector.  Finding a mating connector is the main

 
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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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d.i.y. GPS-Disciplined 10 MHz Frequency Standard / GPS-Based Universal Time Clock

Last week I posted detailed construction information for my rubidium atomic clock frequency reference.  Besides that unit, I also built a GPS-disciplined 10 MHz oscillator to serve as a secondary frequency reference, as well as a source of GPS NMEA data for my ham shack instruments that can use precise location and real-time-clock data (e.g. for

 
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d.i.y. 15 kV @ 30 mA Floating-Output AC or DC High-Voltage Power Supply

Transformers made for powering large neon signs are inexpensive and very reliable.  Most commonly, the secondary is center-tapped, which prevents the use of its full peak-to-peak output in applications where one of the terminals needs to be grounded. In the power supply described in this post, I took out the high-voltage transformer out of its metallic

 
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d.i.y. 10 MHz Atomic Clock Frequency Standard Using Surplus Rubidium Oscillator

Efratom Model M-100 Rubidium Frequency Standard (RFS) oscillators are widely available in the surplus market.  Units on eBay commonly sell in the $150 to $200 range.  Despite their low surplus price, they were originally very expensive components, with superb performance.  The M100 was designed to be used by the military as a master oscillator in high-performance

 
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