Nuclear Power Plant : Read the data and learn the fact - Hojo Tea
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The situation in Japan now is a little messy due to the accident on nuclear power plant.
Japan Prime Minister is paying his full attention on nuclear power plant. The world news is everyday alarming the risk of nuclear pollution and obviously a lot of foreigners are evacuating from Japan. Due to less efficient and accurate communication made by Japanese government, the information being reported by foreign media seems to be getting less accurate but rather a little extreme for now.
Here, I would like to share the information that I have collected by far.
1. Japanese nuclear power plant is using the system called "light water reactor" , which is different from the one used in Russia at Chernobyl Nuclear Power Plant. Chernobyl nuclear power plant was using a carbon reactor. The carbon reactor is in much bigger scale and the explosion was very serious as carbon kept burning for a week. In addition, Chernobyl nuclear power plant exploded when the reactor was active, while Fukushima nuclear power plant was already stopped by the control rod when tsunami hit. The worst scenario that could happen on a nuclear reactor is the pressure vessel melt-down. If it is happen, more radio active substance will be released. However, the pollution will be much more domestic and unlikely to be spread very wide as like what happened in Chernobyl.
http://news.nationalgeographic.com/news/en...ee-mile-island/
2. So far all the artists, including tetsubin artists are safe.
3. In Japan, each prefecture has monitoring post for the radiation. The monitoring is carried out independently by the respective institute in each prefecture. By far, the level of pollution is as follow:
* 1nGy/hr = 1n Sv/hr
* 1nSv = 0.001uSv = 0.000001mSv
a: Fukushima : 500m away from the nuclear reactor - 3.5 micro Sievert/hour based on the latest data on 18th March (3.5uSv/hr)
b: Ibaragi (next prefecture situated in the West) About 0.5uGy/hr =0.5uSv/Hr
http://www.houshasen-pref-ibaraki.jp/present/result01.html
c: Tokyo 0.05μGy/h = 0.05uSv/Hr
http://113.35.73.180/report/report_table.do
d: Nagano (my hometown): 0.08uSv/hr
http://www.pref.nagano.jp/kankyo/kansei/ho...u/houshanou.htm
e: Shizuoka (where most of tea is produced): 70-80nGy/hr = 70-80nSv/hr = 0.07 uSv/hr
http://www.hoshasen.pref.shizuoka.jp/dynam...ble/03-001.html
* CT Scan 6.9mSv = 6900uSv.
* Taking X-ray for one time is at 50,000nSv = 50uSv.
* Taking a flight from Tokyo to New York = 0.2mSv = 200uSv
* The upper limit of radiation dosage per year is set at 50mSv (50,000uSv/year) in Japan.
* Even if there is no pollution by radio-active substance, we are receiving about 2.4mSv/year. It is equivalent to 0.27uSv/hr. (2400uSv/365/24 = 2.7uSv/hr)
The above data indicates that firstly most of the reading shows more or less the same figure as before the disaster took place. Right now a lot of medias are trying to highlight how dangerous the Tokyo is. If our people can manage the situation and the things never get worse, the level of radiation being accumulated in a year in Tokyo is lower than one time of CT Scan. (0.05uSv x 24 x 365 = 435uSv/year)
I hope more attention is paid on the fact rather than the stories and rumors and wish that our people can overcome the obstacle and solve the problem ASAP.
Tea (Chinese/ Oriental/ Japanese /Green), Come share your experience
Mar 19 2011, 04:20 AM
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