wetenschap/science Archives - Page 5 of 8

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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 1057

Electronica english wetenschap/science 📎and tagged Electronica english gammaspectroscopy radioactiviteit radioactivity science scintillation detector
Most fearsome medical treatments

Posted on May 6, 2012 2:42 pm by Johan

I have a more than healthy interest in medical procedures. When I have something or hear from somebody having some sort of serious illness I read up on it. Most stuff is just interesting, but some treatments cause me to fear and respect medicine. Here are some of the treatments I will hopefully never need:

(please note, I am not a doctor, consult one for official opinions on these procedures)

Heart transplant

A heart transplantation is performed when a heart is no longer able to support the patients body. The new heart is harvested from someone who has recently deceased and is kept on artificial circulation to keep the heart in good condition. When the surgery is near, the heart is stopped and put on ice. The patient is put on cardiopulmonary bypass which means that circulation and oxygenation of the blood is done with a heart-lung machine. The old heart is removed, the new one put into its place and connected to the main veins and arteries. The heart is then restarted and from then on handles circulation in its new body. Continue reading → Post ID 1057

english medisch/medical wetenschap/science 📎and tagged cancer fearsome medisch/medical radioactivity respect
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 1057

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 1057

Electronica english wetenschap/science
Arduino environment monitor

Posted on February 16, 2012 10:42 pm by Johan

Above is a picture of my recently (practically ) finished project. It is a sort of weather station which measures light, temperature, relative humidity, atmospheric pressure, and of course radioactivity!

The core of this setup is the excellent DIY Geiger Counter PCB by [Brohogan]. This kit is a geiger counter circuit combined with a standalone Arduino circuit. Most people buy this kit, connect an LCD and put it in a nice box. Because the Atmega328 pins are broken out via handy pin sockets it is very easy to connect any additional components and/or sensors to this PCB. Continue reading → Post ID 1057

computers-networking Electronica english Uncategorized wetenschap/science 📎and tagged arduino bash english geiger counter linux radioactivity weather station

GS-1100A2 teardown and review

Most fearsome medical treatments

Heart transplant

Easy GM tube connecting and testing

Basic scintillation setup

Arduino environment monitor