Sunday, October 16, 2011

Home radiometry results

 after testing house for radiation October 16

Our house and garden seems to be around 0.11-0.14 microsieverts/hr, according to my friend's dosimeter. It's lower as you go up closer to the roof and eaves, not higher as with some houses. Inside is not much different than outside. We tested the sandbox in the park and at the daycare next door, and it was about the same.

He has found 0.2, 0.3, and 0.4 in Chiba. In one case a house in Matsudo had those numbers for the first, second floor, and eaves, respectively. There is a spot along the river in Noda-shi where he measures 0.4. The hot spot in Andersen Park was 0.5 microsieverts/hr. Reality is about 3 times the silly numbers the gov't reports as seen at

I don't really need to strip all organic material and topsoil from the garden, because it is not any more or less radioactive than the surrounding area, and it would eventually become the same anyway. And if i did collect radioactivity in my rain catchment system, it was probably radioactive iodine, which would have decayed by now. Hot spots which exist in Chiba are about 6 miles or 10k north of here.

Thursday, October 13, 2011

Mindmapping your bubble diagram
For the Mac, there is MyMind, a mind-mapping (diagramming) app which converts to and from an outline. Linux has Freemind, VYM(ViewYourMind), Labyrinth, and Semantik, which don't seem to be as good as MyMind. Commercially, there's Inspiration for Windows. Somehow I missed the web-based option of until recently. You can export to png or jpg without creating an account, and control the colors and font sizes easily.

Saturday, October 01, 2011

"Contaminated Zone" in Chiba

Radiation spread reaches Chiba, Saitama prefectures - AJW by The Asahi Shimbun

» In Chiba Prefecture, the highest levels of cesium-137, between 30,000 and 60,000 becquerels per square meter, were detected in northern areas, such as Kashiwa, Matsudo, Abiko and Nagareyama. Cesium-137 has a half-life of 30 years.
In the 1986 Chernobyl nuclear accident, areas with 37,000 becquerels or more of radioactivity per square meter were designated contaminated zones, while levels of 555,000 becquerels or more required forcible relocation.
In Chiba and Saitama prefectures, the highest radiation levels were 0.2 to 0.5 microsievert per hour. In most other areas, the radiation levels were 0.1 microsievert or less.