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  • Easy and cheap CDV-700 tube adapter

    Posted on April 19, 2011 7:11 pm by Johan

    I own a CDV-700 geiger counter of which the tube stopped working. It turns out that replacement tubes are both hard to find and expensive. The simplest option is to buy the LND 720 which basically is a drop-in replacement that should cost about $100.

    It’s also possible to use cheaper, easier to find tubes with the CDV-700.  I found the following post from radio amateur K0FF on the “Geiger Counter Enthousiasts”  group on Yahoo groups. It describes a simple circuit to adapt tubes of varying voltage to the CDV-700. I built one, and it works! Continue reading → Post ID 859


    📂This entry was posted in Electronica english wetenschap/science 📎and tagged civil defense Electronica english geiger counter radioactiviteit radioactivity
  • Online geiger counter using Arduino and Cacti

    Posted on April 2, 2011 6:21 pm by Johan

    I have always had an above average interest in radioactivity.  It’s a subject with political, sociological and scientific aspects. I have been mostly interested in the scientific part, but I also closely follow any news and other developments. With the earthquake in Japan and the following nuclear disaster the discussion about nuclear energy has  been fired up after being quite silent for years. In the Netherlands there was talk about building a new reactor next to the existing plant in Borssele. Well, I guess it will be a bit harder now to get support for this plan…

    To be honest, watching the developments with the damaged reactors in Japan got me thinking again. Is nuclear energy a proper way of generating electricity? Sure,  for the immediate surroundings it is very clean. There are virtually no CO2 emissions and with proper shielding and maintenance you’ll need some pretty advanced equipment to measure any radioactivity coming from a reactor. Still, uranium mining is not very nice for the environment and there is no clear solution for storage of waste. And, if a reactor malfunctions there is the possibility of widespread contamination as currently seen in Japan. So, while I am not against nuclear energy my support for it has weakened somewhat.

    Anyway, enough rambling, how to monitor radiation with your computer!

    Update 18/4: Guess I am not the only one doing some monitoring: http://radgoes.blogspot.com

     

    Continue reading → Post ID 859


    📂This entry was posted in Electronica english wetenschap/science 📎and tagged arduino cacti Electronica geigercounter radioactiviteit radioactivity solderen
  • Uranium

    Posted on March 6, 2010 6:53 pm by Johan

    Intro

    Hoe moeilijk is het om aan een (zeer) kleine hoeveelheid radioactief materiaal zoals uranium te komen?

    Gezien de afstand die het normale volk heeft tot “mysterieuze” zaken als radioactiviteit, redelijk moeilijk zou je denken. De beweging tegen kernwapens en -energie hebben hard hun best gedaan om dit onderwerp zo beladen mogelijk te maken en zijn daar zeker in geslaagd. Continue reading → Post ID 859


    📂This entry was posted in skeptisch/sceptical wetenschap/science 📎and tagged radioactiviteit uranium uraniumglas vaseline glass

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