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Tuesday, August 2, 2011

Lethal Radiation Levels Detected at Fukushima


CNN
3:35 p.m. CDT, August 2, 2011
TOKYO, Japan -- The operator of Japan's crippled Fukushima Daiichi nuclear plant says it has detected record radiation levels at the facility.

Lethal levels of radiation were measured Monday at the bottom of a ventilation tower on the grounds between reactors No. 1 and 2, Tokyo Electric Power Company spokesman Naoki Tsunoda.

The radiation levels are more than double the previous record high that was reached in early June after the devastating quake and tsunami.

The radiation levels measured at 10 sieverts are high enough that a single 60-minute dose would be fatal within weeks.


In addition, 10 sieverts is the highest the Geiger counters used are capable of reading, indicating the actual level could be even higher, Junichi Matsumoto, a general manager at the utility, said at a press conference.

The Fukushima Daiichi disaster occurred when a 15-meter (48-foot) tsunami inundated the coastal plant after northern Japan's historic March 11 earthquake.

The flooding knocked out the cooling systems for the three operating reactors and their associated spent fuel pools, causing the reactors to overheat and hydrogen gas explosions that blew apart the building housing reactors No. 1 and 3.

Another hydrogen blast is believed to have damaged the inside of the No. 2 reactor, while engineers are struggling to manage an estimated 100,000 tons of highly contaminated water that was used to cool the reactors during the emergency.

Tokyo Electric Power Company projects the situation won't be fully over until sometime between October and January. The disaster has caused Japan to rethink its commitment to nuclear energy, and Germany has since announced plans to abandon atomic power entirely by 2022.
at 3:01 PM Posted by JD
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Geiger Counters - Radiation Detection Meters - Handheld Radiation Detector



When it comes to radiation detection meters you really have a wide field of gadgets to choose from, however radiation detectors are the most common to use. First of all if you need to know what type of radiation you are looking for. There are Alpha, Beta and Gamma radiation detectors. And also there is neutron emission of nuclear radiation. And all these different types of emissions have radiation detectors for a specific type of radiation that you can buy radiation detector for. Some also measure both Alpha and Beta. Others detect Alpha, Beta and Gamma. While others let you measure Beta and Gamma radiation.



What most people have use for though are Dosimeters you can buy a handheld radiation detector pretty cheap that are good addition to a survival kit. There are different kinds that you can use that will detect radiation. There are radiation badges that will tell you when radiation become high. Workers at nuclear power plants use these to inform them of how much radiation they have been exposed to. Now also children in the Fukushima prefecture have each been given a radiation badge so they know if they are exposed to radiation. Some come in the shape of a pen that you can carry in your pocket while other are made more compact so that you can attach them to your keychain. And then you have what is called a personal radiation monitor. These are also called Dosimeters and also normally called Geiger counters. Although not all use the Geiger-Muller Tube for the radiation detection some use a semiconductor instead. These and mostly the older geiger counters seen are pretty big to carry around, so they might not be best suited for a survival situation where you only need to carry the most important things. However if you have land and want to check radiation around the property and drinking water then these are the geiger counters to get because they are very well built units.

These are the once that you normally see people use. They have different units of radiation detection, because when it comes to radiation there are many standards used. some give the measurements in Rads, while other use Sieverts. Some have the maximum radiation value for the measured radioactivity quite low but they will still give you an idea of the amount of radiation in the area. With the units ranging from between background radiation 0.001 mSv/hr all the way up to 10 Sv/h. Normally a dosimeter will measure radiation in micro siverts per hour. If you were to walk into one of the reactor units at the Fukushima Daiichi Nuclear Plant you probably would get an error reading from your dosimeter because the radiation levels are so high there.

Note that some places outside the exclusion zone in Fukushima that are too radioactive for people to live in have areas where the radiation levels are above 30 Sv/h. So if you are in a area that have high radiation the radiation detectors would also there go off the scale. However Geiger counters or radiation detectors are still favored as general purpose alpha/beta/gamma portable radiation detectors and radiation detection equipment, due to their low cost and robustness. Most come with an LCD Display that show you the radioactivity in the area. Nowdays you will even get alarm sound and the possibility to connect the device to a computer. Either with a Infrared, Bluetooth or USB connection.

So if you look at the radiation detectors for sale that have this, then these radiation detection meters will allow you to make maps of contaminated areas that show where the radiation is high and low. This also will help you to see which areas are becoming more contaminated over time. With several nuclear reactors in the US and around the world located near fault zones that makes it a danger if a big earthquake would hit the area there is always a good choice to have a radiation dosimeter avaliable. I'm sure many in Fukushima would have been grateful to have dosimeters avaliable at the time of the disaster and I am sure you to would be grateful to have a geiger counter handy when you need one.

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