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

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Two SPCMs on eBay at $400 Each (No Connection To Seller)

SPCMs for sale on eBayToday I found two Perkin Elmer SPCM-AQE-13-FC SPCMs for sale on eBay at $400 each.  eBay auction numbers are 280877451350 and 280877453169.  I am passing along this information in case that blog readers may be interested.  I have no connection whatsoever to seller.

 
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USA Science & Engineering Festival in Washington DC

Shanni Prutchi with Theo Gray, USA Science & Engineering Festival, Washington Dc, April 2012

We just came back from the USA Science & Engineering Festival in Washington DC, where we had the pleasure to meet fellow diy Science authors Theo Gray (Mad Science, The Elements, Popular Science’s Gray Matter, etc.) and William Gurstelle (Backyard Ballistics, Whoosh Boom Splat, The Practical Pyromaniac, etc.)

Shanni Prutchi with William Gurstelle at the USA Science & Engineering Festival, Washington DC, April 2012

 
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Posted to www.prutchi.com: diy High-Power UV/IR/Visible Flashlight

diy High-power UV/IR/Visible flashlight by David Prutchi PhD www.diyPhysics.com
I just posted detailed instructions for the construction of a high-power (10W) flashlight that has interchangeable LED heads to produce UV, IR, or visible illumination.
 
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New Isotope/Geiger Tube Holder at Images Scientific

Radioisotope/GM tube calibrated sled

Image Credit: Images Scientific Corporation

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 platform for radioactive isotopes 1″ diameter discs. The sled isotope holder is available in two sizes:  One that holds 1/8″ thick discs and the other to hold 1/4″ thick discs.

When used in conjunction with the Sled isotope holder a number of nuclear experiments may be performed such as the Inverse Square Law of radiation, half life, shielding effects, etc.

Read more…

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

Perkin Elmer Excelitas single photon avalanche photodiodes on eBay  www.diyPhysics.comSomeone (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, if you are developing a SPCM, using $91 SPADs during debugging is a lot better than frying $1,000 TE-cooled SPADs.

Read more…

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

David and Shanni Prutchi at Barnes&Noble book signing.  Marlton, NJ April 18, 2012We 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  :) Read more…

 
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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 8:30 pm. Call 856.596.6881 to register.
Tuesday April 17, 2012 6:30 PM Marlton 200 West Route 70, Marlton, NJ 08053, 856-596-7058
We will be lecturing at 7:30pm.  Our lecture at 7:30pm and meet & greet are open to the public.  We would love to see you there!
 
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Telling Apart 365 nm from 395 nm Ultraviolet LEDs and Flashlights

Comparison of fluorescence produced on Canadian bills by 365nm and 390nm UV LEDs. David Prutchi, Ph.D.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 the fluorescence produced by an Inova X5MT-UVT 400 nm flashlight.  Much to my surprise, the 365 nm UltraFire caused fluorescence that did not show up at all under the Inova 395 nm flashlight. Read more…

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

 h bar joke.  www.diyPhysics.com

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 the best gags in the business. Sidesplitting or groan-worthy? You decide.

Program announcement in NPR’s Archive:

 http://www.sciencefriday.com/program/archives/201203301

Download mp3 of the show: http://www.podtrac.com/pts/redirect.mp3/traffic.libsyn.com/sciencefriday/scifri201203301.mp3

 

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

Russian-made MC6 Geiger Muller Tube evaluated by David Prutchi PhD www.diyPhysics.com

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. Read more…

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

Tom Van Baak and his family-friendly relativistic time-dilation experiment

Image Credit: Tom Van Baak, Leapsecond.com

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. Read more…

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

diy Alpha-particle Rutherford scattering device by David and Shanni Prutchi www.diyPhysics.com

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 demonstrates that the charge of the atomic nucleus is concentrated at the center of the atom. Read more…

 
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Connecting to Surplus Scionix Miniature Scintillation Probes

Scionix miniature photomultiplier scintillation probe David Prutchi PhD www.diyPhysics.com

Lemo connector on Scionix miniature photomultiplier scintillation probe David Prutchi PhD www.diyPhysics.com

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 problem faced by enthusiasts who find these probes in the surplus market. Read more…

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

diy Signal/High-Voltage Splitter for Scintillation Probe with Single Connector David Prutchi www.diyphysics.comMany 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. Read more…

 
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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)

diy low pass filter interface between photomultiplier scintillation probe amplifier and PRA by David Prutchi Ph.D. www.diyPhysics.comFigure 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 extend the typically narrow output pulses (e.g. 1 to 10 microseconds) so that they can be acquired through the sound card. Read more…

 
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