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Monday, October 17, 2011

☢ Radiation Detectors Find Tokyo Hot Spots - High Levels Cesium Found at Ballpark in Edogawa Japan Parents Uninformed ☢

October 16, 2011
Steve Herman | Tokyo

Boys playing baseball adjacent to shrubbery where a high level of radioactive cesium has been detected, Edogawa, Japan, October 15, 2011.

Residents in the greater Tokyo metropolitan area, the world's most populous with about 33 million people, have taken radiation monitoring into their own hands. They are making some unexpected discoveries following the March tsunami damage to the Fukushima-1 nuclear power plant.

Uninformed parents

Just meters from where a hot spot of radioactive cesium was confirmed days before by a private laboratory, a Little League baseball game was underway Sunday.

The players, their parents and the spectators, mostly neighborhood residents, unaware that some of the dirt here has tested equivalent to four times the minimum level of the contaminated zones from the 1986 Chernobyl accident in Ukraine.

While the news about the Edogawa municipal ballpark complex had been reported overseas, including on the front page of Saturday's New York Times, it had yet to be mentioned in Japan's mainstream media.

Between two of the ball fields, the Odaka family was walking in a small park with their four year-old daughter.

Odaka (who wanted to be identified only by his family name) says he and his wife had not heard anything about the radiation here, nearly 250 kilometers from the reactors that leaked radiation in the days after a huge earthquake and tsunami hit Japan's northeastern Pacific coast on March 11.

He says he would like to know more about the source of the information relayed to him by VOA News. He says the government should evaluate this information and properly inform the public.

If the area is radioactive, then the government, he adds, should decontaminate the area.


Two mothers watching their elementary school age boys playing in a league baseball game, also expressed surprise when asked by VOA News about the adjacent contaminated soil.

The women agree that they have heard numerous general reports about radiation since the March disaster, but felt they could not be overly concerned or they would not be able to go on with their daily lives.

But this is the first time they have heard about a high level of radiation in their own neighborhood. In the nearby city of Yokohama, higher than normal levels of radioactive strontium have been found at three locations.

The suspect materials were analyzed by a private company in Yokohama that charges entities to analyze soil, sediment and food samples for various types of radiation. The Isotope Research Institute is reported to have analyzed thousands of samples sent by citizens, ranging from swimming pool water to breast milk, in the past seven months.

Hot spots

Another hot spot has been uncovered in a children's theme park in Chiba Prefecture, which is adjacent to Tokyo. The reported level of radiation there is higher than in an evacuated village in Fukushima, 45 kilometers from the crippled plant.

Citizen monitoring last week also detected abnormal levels of airborne radiation on a sidewalk on the path to a primary school in an upscale Tokyo neighborhood (in Setagaya ward). That case, however, appears not related to the Fukushima nuclear plant.

Government officials say the radiation source was found under the floor of a nearby house, old bottles containing radium powder. Radium was previously used as a luminous paint to make watch and clock faces glow in the dark.

The incidents have prompted Japan's government to order the science and environment ministries to boost monitoring of radiation levels.

But local and central government officials say the isolated hot spots outside Fukushima are not a cause for alarm because no one spends such an extended period of time at such spots to absorb doses that would harm their health.

They also are expressing skepticism about some of the highest reported readings from citizens, saying they could be erroneous as uncalibrated small dosimeters can be very inaccurate.

Radiation in sea life off the Fukushima coast and its effects on the food chain also remain a concern. Researchers at the Tokyo University of Marine Sciences and Technology say samples of plankton collected in July exhibited high levels of radioactive cesium. Many fish feed on plankton.

But the scientists say it is too soon to conclude a serious risk to humans. Some species of fish caught off Japan's Pacific Coast since the reactor meltdowns have also been found to be contaminated and Japanese authorities moved to halt those fish from being sold.

View the Voice of America Story here - One Tokyo Neighborhood Still Oblivious to Radiation Hot Spot

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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.