Is the radiation level in Japan higher, equal, or lower than in neighbouring countries to Japan that did not (yet) experience a Nuclear Disaster? I decided to find out, so I packed a bGeigie in my check-in luggage when leaving on a business trip to Seoul, Korea, and Hong Kong, China. After arriving at Incheon…
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If you’ve been following our measurements and discussions surrounding them, you know we’ve been saying that the decision to evacuate people in a set radius from the Fukushima Daiichi plant is flawed. Wind, weather, topography and many other factors ensure that radiation isn’t higher the closer you get to the plant, and lower further away,…
It should be no surprise that we think about maps a lot here at Safecast. In fact, it’s probably one of the most frequent topics of conversation. Especially maps with a lot of data and especially making that data understandable. But more than understandable, it needs to be useful. Understanding what data a map is…
Here is a little video of Safecast team members Kalin Kozhuharov and Pieter Franken in Ichikawa, Chiba Prefecture demonstrating some radiation measurement and filtering methods we’re using in Japan. The video is about 20 minutes but runs through many examples to give a clear idea how it all works. 私達が日本で採用している放射線測定方法とフィルタリング方法のいくつかを、SafecastのチームメンバーであるKalin KozhuharovとPieter Frankenが千葉県市川市内で説明している短いビデオをここに掲載します。ビデオは約20分ですが、これらの方法がどのように機能するかを多数の例を挙げながら説明しています。
As you may recall we’ve been working with a team from Keio University and recently equipped them with one of our bGeigie mobile sensor units. Over several days they drove through Fukushima, Iitate and Minami-soma documenting the radiation levels and taking photos of some of the destruction and neighborhoods. The map of those radiation readings…
A new joint survey by the US and Japan shows that evacuations based on distance from the plant is not the best approach. This confirms suspicions that wind carried radioactive particles to the northwest and many areas beyond the current evacuation zone are showing elevated levels, as well as some areas to the southwest that…
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Last month I blogged about our concept bGeigie, which is essentially a pair of geiger counters rigged to a car and connected to a GPS device and laptop to log the points as we drive around the country side. We’ve now completed several of these drives and have mapped out the data so it makes…
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The sensors we’re using are very sensitive and pick up Apha, Beta and Gamma radiation which is different for some equipment and published readings which sometimes eliminate Alpha all together, or focus specifically on high energy Gamma. We’ve created some filters that block different kinds of radiation so we can break down our measurements and…
Last week a team from Keio University took one of our geiger counters for a drive. That was a test run for our slightly more elaborate set up, the first test of which happened this weekend. Rather than taping the counter to the window and taking photos (a method which worked fine btw) we’ve developed…
This graphic is helpful in understanding much about radiation. 放射線についての理解に役立つ解説図があります。リンクをクリックするとこの記事の続きが読めます。