The extremely radioactive black substance was found at 4km from the center of Tokyo.
In 10 minutes walk from Hirai station of JR Sobu line, where is about 4 km from Tokyo station, 5 km from Imperial Palace
black substance was found in several places near the play ground of a public estates.
A local citizen’s group found this and had it analyzed by Prof. Yamauchi from Kobe university. He measured 243,000 Bq/Kg of cesium and the surface dose was 2μSv/h.
Mr. Ishikawa, the chairman of citizen’s group states, the black substance is now everywhere in Tokyo, and it moves by wind or rain.
Roughly estimating, the soil around the black substance is contaminated as 15,600,000 Bq/m2 (cesium134/137).
In Belarus, the place where is more contaminated than 1,480,000Bq/Kg (cesium137) was defined as mandatory evacuation area.
To double the Belarus standard to make it close to the total of cesium 134 and 137, it becomes 2,960,000Bq/m2.
The graph to compare Tokyo to the mandatory evacuation area in Tokyo is below, which shows the contamination situation around Hirai Station is worse than no-man’s zone of Belarus by 527%.
↓ The black substance and a baby stroller
Iori Mochizuki
_____
Français :
240 000 Bq/kg à 5 km du Palais Impérial
De la substance noire extrêmement radioactive a été trouvée à 4 km du centre de Tokyo.
A 10 de marche de la gare de Hirai sur la ligne JR Sobu qui est à environ 4 km de la gare de Tokyo, 5 km du Palais Impérial
la substance noire a été trouvée en plusieurs endroits près de l’aire de jeu d’une résidence publique.
Un groupe d’habitant l’a trouvée et faite analyser par le Pr. Yamauchi de l’université de Kobe. Il a relevé 243 000 Bq/kg de césium et la dose en surface était à 2 μSv/h.
M. Ishikawa, le président de l’association affirme que la substance noire est partout dans Tokyo à présent et qu’elle se déplace selon le vent ou la pluie.
En estimation grossière, le sol autour de la substance noire est contaminé à 15 600 000 Bq/m² (césium134/137).
En Bielorussie, les endroits contaminés à plus de 1 480 000 Bq/kg (césium137) ont été définies comme zone d’évacuation obligatoire.
En doublant le standard biélorusse pour le rapprocher du total des césium 134 et 137, on en arrive à 2 960 000 Bq/m².
Le graphique comparatif entre Tokyo et la zone d’évacuation obligatoire est le suivant et il montre que la situation de la contamination autour de la gare de Hirai est pire que la zone interdite biélorusse à 527 %.
↓ La substance noire et une poussette
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too sad…
I think there is a mistake in the calculation Mr. Ishikawa made to convert it from Bq/kg to Bq/m2
usually, assuming a density of the soil of 1.3 (dry sand) and taking a sample of 5cm deep, you get in 1m2 about 65kg of sample soil.
thus you have a factor 65 (which was used above)
But here, it seems unlikely they took the sample that way, as the sample is on a hard surface. Thus they must have collected some dust and then analysed that. It looks like they must have brushed the dust off the surface or so.
There is no methodology I know how to correctly measure hard surface in Bq/m2 (unless destructive, scraping off a cm or so)
The dose rate suggests the same thing, with 15,600 kBq/m2 you would get a much much higher dose rate, meaning that the activity (total amount of cesium) must be very small, if the concentration in Bq/kg is correct, which I assume to be the case given its analysed by Yamaouchi
It looks like the black sediment comes from the concentration through water flow from a large surface, you can see the collected sediment in the lower parts of that hard surface, where water was standing still after rain and sediments were collected, water evaporated, so you can have a serious concentration, and I would think that this level of activity/kg is not very exceptional. You might have in average some 50kBq/m2 in that area (rough guess)
I am not saying this is insigificant or so, its simply the sad reality. Even with a dose rate of 100nSv/h in Tokyo (which looks pretty normal compared to world average doserate), you still have about 50nSv/h above pre-fukushima (roughly), which at first looks insigificant, but that is coming from cesium activity, its not coming from the earth crust, it is at the surface, can easily be concentrated, and then you get this kind of shit as in the link above.
Thats my impression at least from what I see on the pics
You convinced me. While i wouldnt want my kids playing with this stuff it is the kind of thing thats going to be commonplace in Japan post Fuku, for a long long time…..
[...] Following up this article..240,000 Bq/Kg at 5km from Imperial Palace [...]
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[...] Following up this article..240,000 Bq/Kg at 5km from Imperial Palace [...]
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Fascinating…& outrageous…in the worst way!!
Hi,
I don’t understand the conversion between :
243,000 Bq/Kg into 15,600,000 Bq/m2
Do you think there are ~64kg of this black substance per m^2?
If it is a kind of dust, I estimate it to take (and exagerating, I guess it is less), around 1kg per m^2, which reach then a radioactivity of 243.000 Bq/m^2, it is still high but it is one tenth of Belarus radiation for evacuation.
[...] Fukushima Diary: The extremely radioactive black substance was found at 4km from the center of Tokyo. [...]
Terrible. Please folks, if you can, leave now.
[...] The headline of yesterday..240,000 Bq/Kg at 5km from Imperial Palace [...]
[...] Following up this article..240,000 Bq/Kg at 5km from Imperial Palace [...]
[...] – 650,000,000 Bq/m2 in Minamisoma (Fukushima Diary, May 16, 2012): Following up this article..240,000 Bq/Kg at 5km from Imperial Palace [...]
Wow, Cesium-137 from fall out scatters into everything and it’s very difficult to clean up because it’s ability to scatter every where. Cesium has a long lived radioactivity. How does Cesium clean up begin? How can it be properly cleaned up? Since it scatters into every eco system known to man kind? This is serious and I don’t think the information is coming across as a difficult clean up situation. This isn’t your every day radio activity that people are normally subjected to day to day.
Absolutely awful. The media has no idea what their blackout does when so many people are looking to them for answers. The time to be independent from irresponsible parasites is now.
[...] Following up this article..240,000 Bq/Kg at 5km from Imperial Palace [...]
[...] Following up this article..240,000 Bq/Kg at 5km from Imperial Palace [...]
[...] (cf. 240,000 Bq/Kg at 5km from Imperial Palace) [...]
[...] [...]
Well it is clear that Tokyo is highly irradiated, even if there are doubts concerning the way it is measured. For longterm this will have a lot of consequences on the health of the population. But is there a choice for the people? what can they do? Nearly nothing. Those who are rich can go abroad for a while but will want to come back as they are missing their country and culture. The tragic is similar to Hiroshima and Nagasaki where life had to go on after the hit of the two nuclear bombs.
Those who leave will have regret of abandoning their neighbours, friends, collegues.
The imperial family does give the example. They do stay in tokyo despite being warned and well informed about the tragic situation.
The abandon of Tokyo as capital of Japan would be also an economic desaster. The whole economy of japan is based on high prizes of land and buildings. If Tokyo is declared inhabitable the whole economic structure of japan is breaking down.
already its a miracle that the economic situation is quite stable. But on longterm who will want to invest in a city like Tokyo or a country like japan ? It will be a hard time for japanes people. The good times are over. This is something youth don t understand but the imperial family did understand that immediatedly. Their reaction was immediatedly too. Now their only positive contribution is to stay with their people and to accept this tragic destiny….
[...] As a reference though this is not natural soil, comparing it with the contamination level in Belarus in the same way as this, [...]
[...] (cf, 240,000 Bq/Kg at 5km from Imperial Palace [URL 3]) [...]