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  • Opportunism

    Posted on April 21, 2011 11:23 pm by Johan

    With the developing nuclear disaster in Japan, I discovered that there is lots of money being made selling geiger counters. Prices of geiger counters on Ebay and various other places seem to have tripled instantly.

    Well, you could say that’s the free market in action. But it wouldn’t surprise me if prices are driven up by people not actually needing geiger counters but buying them anyway out of fear while they are not likely to experience any effects of the disaster.

    Today I saw something much worse, some German on Ebay trying to sell a “geiger counter” which actually is a high range survey meter, a CDV715 according to the picture. Continue reading → Post ID 870


    english skeptisch/sceptical wetenschap/science 📎and tagged english radioactiviteit radioactivity sceptisch
  • 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 870


    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 870


    Electronica english wetenschap/science 📎and tagged arduino cacti Electronica geigercounter radioactiviteit radioactivity solderen
  • Triops, update en links

    Posted on November 6, 2010 7:00 pm by Johan

    Momenteel hou ik mij nog steeds bezig met het houden en kweken van Triops. Ik heb de afgelopen maanden wat generaties opgekweekt en weer zien sterven en ik heb eitjes weten af te scheiden om voor toekomstige generaties te kunnen zorgen.

    Op het moment ben ik wat aan het experimenteren om een bak met Triops wat represenatiever te maken met de dingen die je normaliter in aquaria voor vissen ziet. Ik heb grind gebruikt om waterplanten goed te kunnen laten wortelen, en een stuk kienhout op de bodem gelegd. Continue reading → Post ID 870


    biologie/biology wetenschap/science
  • DS1820 Temp. monitoring using Linux and Cacti

    Posted on October 4, 2010 3:23 pm by Johan

    This article will try to explain how to monitor and graph temperatures remotely using Dallas Semiconductor DS18xx sensors, SNMP and Cacti. DS18xx sensors are relatively cheap, accurate and multiple sensors can be connected to a single bus.

    This guide is based on Ubuntu, so YMMV on other Linux/Unix based systems and may need modification to work properly.

    Continue reading → Post ID 870


    computers-networking Electronica english wetenschap/science 📎and tagged cacti ds1820 sensor temperature

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