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New geiger counter build

Posted on July 7, 2012 7:56 pm by Johan

I’m currently building a GM counter for a friend and was looking for nice, low
power circuits working on 9V cells.

I found this circuit which is derivative of Charles Wenzel’s designs:

http://www.mikrocontroller.net/attachment/103170/Geiger_Hochspannung.png

Components are fairly basic apart from the HV transistor and zeners. The other
transistors can be basically any small signal PNP/NPN transistor from the
junkbox. I used BC547 and BC557 and a MPSA44 HV transistor. Continue reading → Post ID 1068

Electronica english wetenschap/science 📎and tagged Electronica english geiger counter high voltage radioactivity soldering
Some info on getting started with radiation detection

Posted on May 23, 2012 2:06 pm by Johan

Quite a lot of the posts on this weblog are about radiation. To summarize some of the information I decided to write this post.

Geiger Counters

If you want to detect some radiation it is the easiest to buy a simple geiger counter. On eBay various geiger counters are sold for varying prices. Also check out the links at the end of the article. Possible options are: Continue reading → Post ID 1068

Electronica english wetenschap/science
GS-1100A2 teardown and review

Posted on May 12, 2012 8:58 pm by Johan

The Australian company Bee Research offers the Gamma Spectacular USB powered scintillation probe bias supplies with integrated preamplifier and audio output. With this box, a scintillation detector and the excellent free PRA software it is possible to perform some basic gamma spectrometry far cheaper than obtaining a multichannel analyser, which usually cost thousands of dollars/euros.

I bought one of these from a Yahoo groups Gamma spectrometry member out of curiosity. What’s in this little box? Continue reading → Post ID 1068

Electronica english wetenschap/science 📎and tagged Electronica english gammaspectroscopy radioactiviteit radioactivity science scintillation detector
Easy GM tube connecting and testing

Posted on March 28, 2012 11:20 pm by Johan

Need a simple interface for connecting GM tubes to geiger counters? Use 1/4″ /6,35mm TRS sockets and plugs. It’s not what these plugs and sockets were designed for but it works nice. I use the tip as positive, ring as return and sleeve for ground. Two wires are sufficient to connect geiger tubes but the sleeve is connected to the ground of the circuit and to the shield of shielded cabling. You can also solder geiger tubes directly to the plug, I have done this with a SI-29BG tube and it works fine. Continue reading → Post ID 1068

Electronica english wetenschap/science 📎and tagged english geiger counter radioactiviteit radioactivity
Basic scintillation setup

Posted on March 17, 2012 6:29 pm by Johan

Pictured above is my recently build scintillation setup. Scintillation detection is detection of radiation by means of a material that emits small pulses of light when struck by radiation. Most scintillation setups consist of a scintillation crystal, most often thallium doped potassium iodide, NaI(Tl) and a photomultiplier tube (PMT).

The PMT is a very sensitive sensor which converts light pulses into electrons. These electrons are multiplied by putting a high voltage across the cathode, a number of auxiliary electrodes called dynodes and the anode. The result is a clear pulse for each detected photon emitted by the scintillation crystal. Continue reading → Post ID 1068

Electronica english wetenschap/science

New geiger counter build

Some info on getting started with radiation detection

Geiger Counters

GS-1100A2 teardown and review

Easy GM tube connecting and testing

Basic scintillation setup