english Archives - Page 7 of 12

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Arduino/Cacti Geiger counter update

Posted on September 6, 2011 8:22 pm by Johan

My online geiger counter which I described earlier has been offline for some time. During that time I experimented with a standalone Arduino with the goal of making a dedicated board for the setup. I have now completed the board shown in the picture below.

In the picture you can see the HV generator on the top of the board, on the lower left the Arduino standalone parts along with a MAX232 as a level converter for easy serial hookup and on the right two tubes connected in parallel, a SI-29BG (beta and gamma) and a SI-12B for added alpha sensivity. Also shown are the USB>Serial adapter and a separate USB connector to provide 5V to the board. Continue reading → Post ID 921

computers-networking english wetenschap/science 📎and tagged arduino cacti english geiger counter radioactiviteit radioactivity
Oog update / Eye update

Posted on August 20, 2011 1:11 pm by Johan

(Scroll down for summary in English)

Wat betreft mijn ogen gaat het momenteel goed en matig. Mijn linkeroog heeft een nieuwe sclerale lens gekregen die behoorlijk scherper zicht geeft. Ik heb mijn computer nu op een hogere resolutie staan omdat ik weer wat beter kan zien.

Met mijn rechteroog gaat het helaas minder goed. Na de afstotingsreactie is de algehele toestand van dat oog niet beter geworden. Er slaan regelmatig pijnlijke putjes in het oogoppervlak bij de verdikte plek in het transplantaat en het restzicht is slechter geworden, het oog is ook vaker mistig omdat vocht blijkbaar niet goed wordt afgevoerd. In de avond kan het zicht echter behoorlijk goed zijn. Continue reading → Post ID 921

english keratoconus medisch/medical 📎and tagged corneal transplant hoornvlies hoornvliestransplantatie keratoconus medisch/medical
CPM to Sv/R conversion and workings of GM tubes

Posted on June 18, 2011 5:04 pm by Johan

(picture: “Geiger Tube” by “dh” on Flickr, showing Russian SBM-20 hard beta and gamma GM tube)

On the internet there lots of DIY people showing off their homebuilt Geiger counter circuits, complete with microprocessors and LCD’s calculating and displaying count rates and often the dose rate in microsieverts/roentgen per hour.

The last thing surely makes a project look more impressive with the floating point number with a weird unit that most people are unfamiliar with. It’s not a big deal with DIY setups but there are lots of mentions of sending projects to Japan to help people over there “measure” contamination. Continue reading → Post ID 921

Electronica english wetenschap/science
Afstoting/Rejection

Posted on May 21, 2011 1:10 pm by Johan

(Een van de afstotingsreacties / One of the rejection episodes)

(English summary can be found below as usual)

De laatste tijd heb ik helaas erg veel last gehad van mijn oog door terugkerende afstotingsverschijnselen. Vorige week dinsdag (10/5) was het goed mis. Ik werd wakker met enorm mistig zicht en een vuurrood oog. Ik had het de vorige avond al een beetje voelen aankomen, het oog was toen al aan de kant van mijn neus rood aan het worden. Continue reading → Post ID 921

english keratoconus medisch/medical 📎and tagged corneal transplant hoornvliestransplantatie keratoconus medisch/medical oog
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 921

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

Arduino/Cacti Geiger counter update

Oog update / Eye update

CPM to Sv/R conversion and workings of GM tubes

(picture: “Geiger Tube” by “dh” on Flickr, showing Russian SBM-20 hard beta and gamma GM tube)

Afstoting/Rejection

Opportunism