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PostPosted: Thu, 17-03-11, 16:27 GMT 
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Hi all,

here you find the link to the official measurements of radioactivity for many Japanese cities and on a day-by-day/hour-by-hour basis.

http://eq.wide.ad.jp/index_en.html

Units are μSv/hour (Sv = Sievert, accounts for biological effects of ionizing radiation)

Analogously for locations > 20 km around Fukushima Daiichi nuclear plant (see image with measurement points on last page and below)

http://eq.wide.ad.jp/110317fukushima_1000_en.html

Image

It is very easy to read the data out (Perl/Maple) and to make more intuitive plots.
Anybody volunteering? ;-)


Fridger

PS:

Here is a western translation for each prefecture(city), with the help of which you may find the columns of interest in the online radiation tables without being able to read Japanese...

City List of the Table:

1 北海道(札幌市) Hokkaido (Sapporo)
2 青森県(青森市) Aomori (Aomori)
3 岩手県(盛岡市) Iwate (Morioka)
4 宮城県(仙台市) Miyagi (Sendai)
5 秋田県(秋田市) Akita (Akita)
6 山形県(山形市) Yamagata (Yamagata)
7 福島県(双葉郡) Fukushima (Futaba-Gun)
8 茨城県(水戸市) Ibaraki(Mito)
9 栃木県(宇都宮市) Tochigi(Utsunomiya)
10 群馬県(前橋市) Gunma(Maebashi)
11 埼玉県(さいたま市) Saitama(Saitama)
12 千葉県(市原市) Chiba(Ichihara)
13 東京都(新宿区) Tokyo(Shinjuku)
14 神奈川県(茅ヶ崎市) Kanagawa(Chigasaki)
15 新潟県(新潟市) Niigata(Niigata)
16 富山県(射水市) Toyama(Imizu)
17 石川県(金沢市) Ishikawa(Kanazawa)
18 福井県(福井市) Fukui(Fukui)
19 山梨県(甲府市) Yamanashi(Koufu)
20 長野県(長野市) Nagano(Nagano)
21 岐阜県(各務原市) Gifu(Kakamigahara)
22 静岡県(静岡市) Shizuoka(Shizuoka)
23 愛知県(名古屋市) Aichi(Nagoya)
24 三重県(四日市市) Mie(Yokkaichi)
25 滋賀県(大津市) Shiga(OTSU)
26 京都府(京都市) Kyoto(Kyoto)
27 大阪府(大阪市) Osaka(Osaka)
28 兵庫県(神戸市) Hyogo(Kobe)
29 奈良県(奈良市) Nara(Nara)
30 和歌山県(和歌山市) Wakayama(Wakayama)
31 鳥取県(東伯郡) Tottori(Touhaku-Gun)
32 島根県(松江市) Shimane(Matsue)
33 岡山県(岡山市) Okayama(Okayama)
34 広島県(広島市) Hiroshima(Hiroshima)
35 山口県(山口市) Yamaguchi(Yamaguchi)
36 徳島県(徳島市) Tokushima(Tokushima)
37 香川県(高松市) Kagawa(Takamatsu)
38 愛媛県(松山市) Ehime(Matsuyama)
39 高知県(高知市) Kouchi(Kouchi)
40 福岡県(太宰府市) Fukuoka(Dazaifu)
41 佐賀県(佐賀市) Saga(Saga)
42 長崎県(大村市) Nagasaki(Omura)
43 熊本県(宇土市) Kumamoto(Uto)
44 大分県(大分市) Oita(Oita)
45 宮崎県(宮崎市) Miyazaki(Miyazaki)
46 鹿児島県(鹿児島市) Kagoshima(Kagoshima)
47 沖縄県(うるま市) Okinawa(Uruma)


Footnote:

* Blanks represent no data available
* μGy/h (microgray per hour) ≈ μSv/h (microsievert per hour)
* The Ministry of Education, Culture, Sports, Science and Technology of Japan created this report based on data colected from each prefecture. Translation by volunteers students of Keio University.


Last edited by t00fri on Sat, 19-03-11, 14:05 GMT, edited 8 times in total.

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PostPosted: Thu, 17-03-11, 18:04 GMT 
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Tx Fridger for these datas!
I'm following the entire situation since 3 days now via the live stream from Le Monde (a French newspaper).
This disaster is so unbelievable! Things could not be worst, quake, tsunami, nuclear meltdown and to help out SNOW on top!! :shock:

I really hope they will be able to reconnect power within the next hours, I guess THAT would be a great news...


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PostPosted: Thu, 17-03-11, 18:11 GMT 
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ElChristou wrote:
Tx Fridger for these datas!
I'm following the entire situation since 3 days now via the live stream from Le Monde (a French newspaper).
This disaster is so unbelievable! Things could not be worst, quake, tsunami, nuclear meltdown and to help out SNOW on top!! :shock:

I really hope they will be able to reconnect power within the next hours, I guess THAT would be a great news...


Salut, old friend!

I hope you are fine? Yes, that triple disaster along with the tremendous suffering of the Japanese people is hard to bear!

Cheers,
Fridger


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PostPosted: Thu, 17-03-11, 18:32 GMT 
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Here is another page with an online plot (cpm = counts per minute) of radiation readings with a small Geiger-Mueller counter (GM-10) .

http://park30.wakwak.com/~weather/geiger_index.html

Location: Tokyo. 2nd floor of a wooden residential building near the window. 250km SSW from the Fukushima Daiichi plant.

When you start seeing a substantial rise or a peak, things may get dangerous...But for now the level is very close to normal.

Wind direction and wind speed (Tokyo):
--------------------------------------------------------
ImageImage

Radiation, counts per minute (cpm) versus date/time
-------------------------------------------------------------------------
Image

Reference counts Dec 2010
--------------------------------------
Image


The horizontal axis is time/date. Moreover the bottom image refers to a reference reading way before the nuclear accident! So you see whenever there is a deviation from normal level in Tokyo.

Here are the readings from March 15 (2 days ago)! That's how they look when radiation is coming in....

Image

Fridger


Last edited by t00fri on Sun, 20-03-11, 10:37 GMT, edited 7 times in total.

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PostPosted: Thu, 17-03-11, 19:22 GMT 
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Here is a close-up of the Fukushima nuclear reactors from a video released today by TEPCO from a helicopter flight (March 16) over the plant.

http://www.youtube.com/watch?v=lBXqiw6EJUk

Fridger


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PostPosted: Thu, 17-03-11, 19:55 GMT 
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Here you can see the radiation plume from Fukushima Daiichi heading towards the US! The animation is taken from Spiegel Online (http://www.spiegel.de/)

Image

The actual time is displayed on top of the image. According to the UN forcast (NY Times), the radiation plume is going to hit southern California by Friday, i.e. tomorrow

Here you see the plume from the UN forcast on a larger scale on YouTube

http://www.youtube.com/watch?v=AIgiDaMB0G4&NR=1
http://www.youtube.com/watch?v=bEf5O8R5Wl0


Fridger


Last edited by t00fri on Fri, 18-03-11, 19:40 GMT, edited 2 times in total.

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PostPosted: Fri, 18-03-11, 16:09 GMT 
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Reiko wrote:
Where exactly you need translations?


Well, Reiko,

fortunately, there are now an increasing number of translations coming in (e.g. by Japanese students).

I rather thought that I'd leave this to your own judgement: if you think you read some relevant info in the japanese material collected here, you might just leave a comment in English about it.
Just anything you find relevant for us to know...

Here is something specific

On the site from which I took the above radiation monitoring plot,
http://park30.wakwak.com/~weather/geiger_index.html

there are also two dials at the top that have something to do with the speed and direction of the wind. There are some explanations in Japanese that might be interesting...

Thanks for your help,
Fridger


Last edited by t00fri on Fri, 18-03-11, 20:48 GMT, edited 1 time in total.

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PostPosted: Fri, 18-03-11, 16:50 GMT 
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Hi all,

meanwhile the Japanese authorities have also added plots to their tables with the actual radiation levels.

The two most relevant files for us seem these containing mainly plots of the radiation in
the usual units of μSv/h = (micro-Sievert / hour)

March 18th
=========
http://eq.wide.ad.jp/files/110318graphs_1600.pdf

p5-Iwate, p6-Akita, p7-Yamagata, p8-Niigata, p9-Tochigi, p10-Ibaraki, p11-Saitama, p12-Chiba, p13-Tokyo

March 17th
=========
http://eq.wide.ad.jp/files/110317graphs_1900.pdf

p1-Iwate, p2-Akita, p3-Yamagata, p4-Niigata, p5-Tochigi, p6-Ibaraki, p7-Saitama, p8-Chiba, p9-Tokyo

p1, p2,... denote the plot numbers referring to the various Japanese prefectures (cities). Tokyo is always last. Ibaraki is somewhat north of Tokyo, for example. There are also locations at the west coast of Japan.

As an example, here is the radiation in μSv/h for Tokyo as function of date/time (including March 18th). You see the characteristic series of spikes between March 15 and March 16. The radiation level in Tokyo rose to something around 0.5 μSv/h.

Image

So now compare what happened during the same period of time near the Fukushima nuclear plant: Here is a plot as taken from the German Spiegel-online site (http://www.spiegel.de/). The data have been measured by TEPCO.

Image

You can clearly now associate the peaks with various events at the Fukushima I plant.
However, take a look at the scale of radiation!!! The peak values here are around 12000
μSv/h! This is to be compared with a maximum of 0.5 μSv/h measured in Tokyo.

In order to appreciate the effects on peoples' health, note first that it is not the radiation rate in μSv/h but the sum (integral) over time that counts.

+++++++++++++++++++
If you have an X-ray taken of your spine, you absorb a dose of around 1.2 mSv (milli=1000 * micro). A computer tomography of your entire body amounts to 10 mSv.
An anual dose of 100 mSv triggers cancer with 1 % of the exposed people. Accute radiation illness is caused by 250 mSv. Finally a dose of 4000 mSv is considered lethal.
++++++++++++++++++

Fridger


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PostPosted: Fri, 18-03-11, 17:21 GMT 
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Here is a live-radiation monitor in cpm = counts-per-minute from West-LA / US

++++++++++++++++++++++++++++++++++++++++++++++++++
http://www.ustream.tv/channel/live-radi ... om-west-la
++++++++++++++++++++++++++++++++++++++++++++++++++
A range of normal background radiation has been determined to be between 40 to 46 CPM.

More info about this monitoring station you find on the homepage:
http://www.enviroreporter.com/2011/03/e ... n-station/

The arrival of the radiation plume in south California was forcast for March 18...
Actually, on March 19, minuscule traces of radiation have indeed been measured in Sacramento. But there is absolutely no associated health risk (so far).

Here are some recent 10-minute averages of the measured rates

3/19/11
Code:
2:17 pm 10-minute average: 41.9 Counts Per Minute NORMAL
10:45 am 10-minute average: 39.8 Counts Per Minute NORMAL

3/18/11
Code:
11:50 pm 10-minute average: 41.9 Counts Per Minute NORMAL
8:30 pm 10-minute average: 41.4 Counts Per Minute NORMAL
5:05 pm 10-min average: 42.7 Counts Per Minute NORMAL
1:00 pm 10-min average: 44.8 Counts Per Minute NORMAL
9:10 am 10-minute average: 44.2 Counts Per Minute NORMAL
1:42 am 10-minute average: 45.1 Counts Per Minute NORMAL


Fridger


Last edited by t00fri on Sun, 20-03-11, 15:25 GMT, edited 6 times in total.

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PostPosted: Fri, 18-03-11, 18:20 GMT 
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The originally linked Geiger-Mueller counter in Tokyo went offline a few days ago. Here is another one, I suppose also in Tokyo

EDIT: again now we see yet another one with rates agreeing reasonably well with the above GM-10 monitored radiation (average count: <cpm> = 16.52 +- 3.8 ) ...

http://www.ustream.tv/channel/%E3%82%AC%E3%82%A4%E3%82%AC%E3%83%BC%E3%82%AB%E3%82%A6%E3%83%B3%E3%82%BF



Fridger


Last edited by t00fri on Sun, 20-03-11, 15:32 GMT, edited 4 times in total.

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PostPosted: Fri, 18-03-11, 19:58 GMT 
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Yesterday were 16 cpm, today 22. Moreover, through the Spiegel data is clear that TEPCO is hiding the real situation. Even the IAEA play an obscure role:
from http://www.iaea.org/newscenter/news/tsunamiupdate01.html

Quote:
Japan Earthquake Update (18 March 2011, 10:15 UTC)

Japanese authorities have informed the IAEA that new INES ratings have been issued for some of the events relating to the nuclear emergency at the Fukushima Daiichi and Daini nuclear power plants.
Japanese authorities have assessed that the core damage at the Fukushima Daiichi 2 and 3 reactor Units caused by loss of all cooling function has been rated as 5 on the INES scale.
Japanese authorities have assessed that the loss of cooling and water supplying functions in the spent fuel pool of the Unit 4 reactor has been rated as 3.
Japanese authorities have assessed that the loss of cooling functions in the reactor Units 1, 2 and 4 of the Fukushima Daini nuclear power plant has also been rated as 3. All reactor Units at Fukushima Daini nuclear power plant are now in a cold shut down condition.


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PostPosted: Fri, 18-03-11, 20:09 GMT 
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Massimo,

unfortunately yesterday's Geiger counter (now offline, service?) is a different instrument from today's. The two had somewhat diffrent readings. There are various possible reasons: position in the house (wood, concrete? window?) or efficiency of instrument which is a material constant varying between instruments. These cheap Geiger counters only serve as relative indicators of radiation.

Yes we have heard that today the overall INES rating went up from 4 to 5. The rest of the made statements I am not sure I fully understand...

Fridger


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PostPosted: Fri, 18-03-11, 21:03 GMT 
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Citations in black are mine. Before is said that the INES scale has been rated from 4 to 5 in two and three reactor Units, then is said that ALL the reactor Units are "in a cold shut down condition". If the condition is as such, why to rise the INES scale? At least it should have been costant or diminuishing.

_________________
Never at rest.
Massimo


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PostPosted: Sun, 20-03-11, 15:46 GMT 
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Official update of radiation at posts around Fukushima Dai-ichi for March 20 (local date)

Image

The data are from http://eq.wide.ad.jp/index_en.html
as always.

Fridger


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PostPosted: Sun, 20-03-11, 16:02 GMT 
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Radiation in drinking water for some locations including Tokyo (yellow). Units are Bq/kg

Some non-dangerous amounts of contamination in the drinking water have now been found
Image

The first number in the table refers to I-131, while the second one refers to Cs-137.

According to the Nuclear Safety Commission of Japan", upper limits for intake are: I-131:More than 300Bq/kg, Cs-137:More than 200Bq/kg

Fridger


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