internationalnucleareventscale7

Icon

power – strom und macht

Radioactivity in Japan

Susanne Gerber

20.06.2011

TEPCO also began late Sunday to release air containing radioactive substances from the building of reactor 2 by opening its doors. An estimated 1.6 billion becquerels of radioactive materials were released, compared with 500 million becquerels when the double doors of the building of reactor 1 were opened in May, the Jiji Press agency reported, citing TEPCO.

Japan is dangerously contaminated by radioactivity over a far larger area than previously reported by TEPCO and the central government according to new reports from multiple sources. The prefectural government of Iwate released new data that shows radioactive contamination of grass exceeds safety standards at a distance of 90 to 125 miles from the damaged Fukushima nuclear power plants. The prefectural government found on Tuesday radioactive cesium exceeding the limit of 300 becquerels per kilogram in grass collected from pastures in four areas, including Tono and Otsuchi. The areas are located about 150 to 200 kilometers north of the Fukushima nuclear power plant. Science Magazine reports that Japanese scientists have become so concerned about the health of their children that they have initiated their own radiation monitoring program and made their own maps. The results are shocking. It shows one wide belt of radiation reaching 225 kilometers south from the stricken reactors to Tokyo and another extending to the southwest. Within those belts are localized hot spots, including an oval that encloses northeast Tokyo and Kashiwa and neighboring cities in Chiba Prefecture.

A map of citizen measured radiation levels shows radioactivity is distributed in a complex pattern reflecting the mountainous terrain and the shifting winds across a broad area of Japan north of Tokyo which is in the center of the of bottom of the map.


Radiation limits begin to be exceeded at just above 0.1 microsieverts/ hour blue. Red is about fifty times the civilian radiation limit at 5.0 microsieverts/hour. Because children are much more sensitive than adults, these results are a great concern for parents of young children in potentially affected areas.

TEPCO announced that the accident probably released more radioactive material into the environment than Chernobyl, making it the worst nuclear accident on record. Meanwhile, a nuclear waste advisor to the Japanese government reported that about 966 square kilometres near the power station – an area roughly 17 times the size of Manhattan – is now likely uninhabitable. In the US, physician Janette Sherman MD and epidemiologist Joseph Mangano published an essay shedding light on a 35 per cent spike in infant mortality in northwest cities that occurred after the Fukushima meltdown, and may well be the result of fallout from the stricken nuclear plant. According to Gundersen, the exposed reactors and fuel cores are continuing to release microns of caesium, strontium, and plutonium isotopes. These are referred to as „hot particles“. „We are discovering hot particles everywhere in Japan, even in Tokyo,“ he said. „Scientists are finding these everywhere. Over the last 90 days these hot particles have continued to fall and are being deposited in high concentrations. A lot of people are picking these up in car engine air filters.“ Radioactive air filters from cars in Fukushima prefecture and Tokyo are now common, and Gundersen says his sources are finding radioactive air filters in the greater Seattle area of the US as well. The hot particles on them can eventually lead to cancer. Gundersen pointed out that the units are still leaking radiation. „They are still emitting radioactive gases and an enormous amount of radioactive liquid,“ he said. „It will be at least a year before it stops boiling, and until it stops boiling, it’s going to be cranking out radioactive steam and liquids.“ Gundersen worries about more earthquake aftershocks, as well as how to cool two of the units. „Unit four is the most dangerous, it could topple,“ he said. „After the earthquake in Sumatra there was an 8.6 [aftershock] about 90 days later, so we are not out of the woods yet. And you’re at a point where, if that happens, there is no science for this, no one has ever imagined having hot nuclear fuel lying outside the fuel pool. They’ve not figured out how to cool units three and four.“ Indeed, a 5.9 earthquake hit 110 kilometers from Fukushima today.

A water decontamination system has been halted after a rapid rise in radiation. Radiation limits were reached in 5 hours, when it wasn’t supposed to happen for a month. As Jamail notes, the long-term prognosis is challenging: „Units one through three have nuclear waste on the floor, the melted core, that has plutonium in it, and that has to be removed from the environment for hundreds of thousands of years,“ he said. „Somehow, robotically, they will have to go in there and manage to put it in a container and store it for infinity, and that technology doesn’t exist. Nobody knows how to pick up the molten core from the floor, there is no solution available now for picking that up from the floor.“ Dr Sawada says that the creation of nuclear fission generates radioactive materials for which there is simply no knowledge informing us how to dispose of the radioactive waste safely. „Until we know how to safely dispose of the radioactive materials generated by nuclear plants, we should postpone these activities so as not to cause further harm to future generations,“ he explained. „To do otherwise is simply an immoral act, and that is my belief, both as a scientist and as a survivor of the Hiroshima atomic bombing.“ Gundersen believes it will take experts at least ten years to design and implement the plan.“So ten to 15 years from now maybe we can say the reactors have been dismantled, and in the meantime you wind up contaminating the water,“ Gundersen said. „We are already seeing Strontium [at] 250 times the allowable limits in the water table at Fukushima. Contaminated water tables are incredibly difficult to clean. So I think we will have a contaminated aquifer in the area of the Fukushima site for a long, long time to come.“ Unfortunately, the history of nuclear disasters appears to back Gundersen’s assessment. „With Three Mile Island and Chernobyl, and now with Fukushima, you can pinpoint the exact day and time they started,“ he said, „But they never end.“

http://enenews.com/happening-now-1-6-billion-becquerels-of-radioactive-materials-released-from-reactor-no-2-late-sunday-says-tepco

http://www.washingtonsblog.com/2011/06/global-nuclear-update.html

Advertisements

Einsortiert unter:Accident, Fukushima, Radiation

Kommentar verfassen

Trage deine Daten unten ein oder klicke ein Icon um dich einzuloggen:

WordPress.com-Logo

Du kommentierst mit Deinem WordPress.com-Konto. Abmelden / Ändern )

Twitter-Bild

Du kommentierst mit Deinem Twitter-Konto. Abmelden / Ändern )

Facebook-Foto

Du kommentierst mit Deinem Facebook-Konto. Abmelden / Ändern )

Google+ Foto

Du kommentierst mit Deinem Google+-Konto. Abmelden / Ändern )

Verbinde mit %s

%d Bloggern gefällt das: