Radioactive hot particles still afloat throughout Japan six years after Fukushima meltdowns — BuzzFlash

” Radioactive particles of uranium, thorium, radium, cesium, strontium, polonium, tellurium and americium are still afloat throughout Northern Japan more than six years after a tsunami slammed into the Fukushima Daiichi Power Plant causing three full-blown nuclear meltdowns. That was the conclusion reached by two of the world’s leading radiation experts after conducting an extensive five-year monitoring project.

Arnie Gundersen and Marco Kaltofen authored the peer reviewed study titled, Radioactively-hot particles detected in dusts and soils from Northern Japan by combination of gamma spectrometry, autoradiography, and SEM/EDS analysis and implications in radiation risk assessment, published July 27, 2017, in Science of the Total Environment (STOLEN).

Gundersen represents Fairewinds Associates and is a nuclear engineer, former power plant operator and industry executive, turned whistleblower, and was CNN’s play-by-play on-air expert during the 2011 meltdowns. Kaltofen, of the Worcester Polytechnic Institute (WPI), is a licensed civil engineer and is renowned as a leading experts on radioactive contamination in the environment.

415 samples of “dust and surface soil” were “analyzed sequentially by gamma spectrometry, autoradiography, and scanning electron microscopy with energy dispersive X-ray analysis” between 2011 and 2016. 180 of the samples came from Japan while another 235 were taken from the United States and Canada. The study further clarifies, “Of these 180 Japanese particulate matter samples, 57 were automobile or home air filters, 59 were surface dust samples, 29 were street dusts (accumulated surface soils and dusts) and 33 were vacuum cleaner bag or other dust samples.”

108 of the Japanese samples were taken in 2016, while the other 72 were gathered in 2011 after the meltdowns. Gundersen and Kaltofen tapped 15 volunteer scientists to help collect the dust and soil — mostly from Fukushima Prefecture and Minamisoma City. “A majority of these samples were collected from locations in decontaminated zones cleared for habitation by the National Government of Japan,” the study revealed. For the 108 samples taken in 2016, an “International Medcom Inspector Alert surface contamination monitor (radiation survey meter) was used to identify samples from within low lying areas and on contaminated outdoor surfaces.”

Fairewinds Associates’ video from 2012 features Gundersen collecting five samples of surface soil from random places throughout Tokyo — places including a sidewalk crack, a rooftop garden, and a previously decontaminated children’s playground. The samples were bagged, declared through Customs, and brought back to the U.S. for testing. All five samples were so radioactive that according to Gundersen, they “qualified as radioactive waste here in the United States and would have to be sent to Texas to be disposed of.” Those five examples were not included as part of the recently released study, but Gundersen went back to Tokyo for samples in 2016. Those samples were included, and were radioactive, and according to Gundersen were “similar to what I found in Tokyo in [2012].”

Furthermore, 142 of the 180 samples (about 80 percent) contained cesium 134 and cesium 137. Cesium 134 and 137, two of the most widespread byproducts of the nuclear fission process from uranium-fueled reactors, are released in large quantities in nuclear accidents. Cesium emits intense beta radiation as it decays away to other isotopes, and is very dangerous if ingested or inhaled. On a mildly positive note, the study shows that only four of the 235 dust samples tested in the United States and Canada had detectable levels of cesium from Fukushima.

Cesium, due to its molecular structure, mimics potassium once inside the body, and is often transported to the heart where it can become lodged, thereafter mutating and burning heart tissue which can lead to cardiovascular disease. Other isotopes imitate nutritive substances once inside the body as well. Strontium 90 for example mimics calcium, and is absorbed by bones and teeth.

“Different parts of the human body (nerves, bones, stomach, lung) are impacted differently,” Kaltofen told EnviroNews in an email. “Different cells have radio-sensitivities that vary over many orders of magnitude. The body reacts differently to the same dose received over a short time or a long time; the same as acute or chronic doses in chemical toxicity.”

In contrast to external X-rays, gamma, beta or alpha rays, hot particles are small mobile pieces of radioactive elements that can be breathed in, drunk or eaten in food. The fragments can then become lodged in bodily tissue where they will emanate high-intensity ionizing radiation for months or years, damaging and twisting cells, potentially causing myriad diseases and cancer. The study points out, “Contaminated environmental dusts can accumulate in indoor spaces, potentially causing radiation exposures to humans via inhalation, dermal contact, and ingestion.”

The study also explains, “Given the wide variability in hot particle sizes, activities, and occurrence; some individuals may experience a hot particle dose that is higher or lower than the dose calculated by using averaged environmental data.” For example, a person living in a contaminated area might use a leaf blower or sweep a floor containing a hefty amount of hot particle-laden dust and receive a large does in a short time, whereas other people in the same area, exposed to the same background radiation and environmental averages, may not take as heavy a hit as the housekeeper that sweeps floors for a living. People exposed to more dust on the job, or who simply have bad luck and haphazardly breathe in hot radioactive dust, are at an increased risk for cancer and disease. High winds can also randomly pick up radioactive surface soil, rendering it airborne and endangering any unsuspecting subject unlucky enough to breath it in.

Hot particles, or “internal particle emitters” as they are sometimes called, also carry unique epidemiological risks as compared to a chest X-ray by contrast. The dangers from radiation are calculated by the dose a subject receives, but the manner in which that dose is received can also play a critical factor in the amount of damage to a person’s health.

“Comparing external radiation to hot particles inside the body is an inappropriate analogy,” Gundersen toldEnviroNewsin an email. “Hot particles deliver a lot of energy to a very localized group of cells that surround them and can therefore cause significant localized cell damage. External radiation is diffuse. For example, the weight from a stiletto high heal shoe is the same as the weight while wearing loafers, but the high heal is damaging because its force is localized.”

Kaltofen elaborated with an analogy of his own in a followup email with EnviroNews saying:

Dose is the amount of energy in joules absorbed by tissue. Imagine Fred with a one joule gamma dose to the whole body from living in a dentist’s office over a lifetime, versus Rhonda with exactly the same dose as alpha absorbed by the lung from a hot particle. Standard health physics theory says that Fred will almost certainly be fine, but Rhonda has about a 10 percent chance of dying from lung cancer — even though the doses are the same.

External radiation and internal hot particles both follow exactly the same health physics rules, even though they cause different kinds of biological damage. Our data simply shows that you can’t understand radiation risk without measuring both.

Some isotopes, like plutonium, only pose danger to an organism inside the body. As an alpha emitter, plutonium’s rays are blocked by the skin and not strong enough to penetrate deep into bodily tissue. However, when inhaled or ingested, plutonium’s ionizing alpha rays twist and shred cells, making it one of the most carcinogenic and mutagenic substances on the planet.

“Measuring radioactive dust exposures can be like sitting by a fireplace,” Dr. Kaltofen explained in a press release. “Near the fire you get a little warm, but once in a while the fire throws off a spark that can actually burn you.”

“We weren’t trying to see just somebody’s theoretical average result,” Kaltofen continued in the press release. “We looked at how people actually encounter radioactive dust in their real lives. [By] combining microanalytical methods with traditional health physics models… we found that some people were breathing or ingesting enough radioactive dust to have a real increase in their risk of suffering a future health problem. This was especially true of children and younger people, who inhale or ingest proportionately more dust than adults.”

“Individuals in the contaminated zone, and potentially well outside of the mapped contaminated zone, may receive a dose that is higher than the mean dose calculated from average environmental data, due to inhalation or ingestion of radioactively-hot dust and soil particles,” the study says in summation. “Accurate radiation risk assessments therefore require data for hot particle exposure as well as for exposure to more uniform environmental radioactivity levels.” ”

source with video by Arnie Gundersen

Radiation levels exceeding state-set limit found on grounds of five Chiba schools — The Japan Times

” Radiation levels exceeding the government-set safety limit of 0.23 microsieverts per hour have been detected on the grounds of five schools in the city of Kashiwa, Chiba Prefecture, the prefectural board of education said Monday.

Between late April and mid-May, the board officials detected radiation levels of up to 0.72 microsieverts per hour in certain areas of the schools, including Kashiwa High School and Kashiwa Chuo High School. The areas — including soil near a school swimming pool and drainage gutters — are not frequented by students, but the board closed them off and will work to quickly decontaminate them, the officials said.

Kashiwa has been one of the areas with high radiation readings since the 2011 nuclear disaster at Tokyo Electric Power Company Holdings Inc.’s Fukushima No. 1 power plant.

According to NHK, the board of education had been checking the soil on the school premises in Kashiwa after radiation levels beyond the state limit were detected in shrubbery near the city’s public gymnasium. The board will announce the results of radiation tests at other schools in the prefecture around the end of July, NHK reported. ”

by Kyodo, The Japan Times


High levels of cesium radioactive material migrating down into soil around Fukushima — Global Research

” High levels of radioactive cesium remain in the soil near the Fukushima Daiichi nuclear power plant and these radionuclides have migrated at least 5 centimeters down into the ground at several areas since the nuclear accident five years ago, according to preliminary results of a massive sampling project being presented at the JpGU-AGU joint meeting in Chiba, Japan.

In 2016, a team of more than 170 researchers from the Japanese Geoscience Union and the Japan Society of Nuclear and Radiochemical Sciences conducted a large-scale soil sampling project to determine the contamination status and transition process of radioactive cesium five years after a major earthquake and tsunami caused a nuclear accident at the Fukushima Daiichi plant.

The team collected soil samples at 105 locations up to 40 kilometers (25 miles) northwest of the Fukushima Daiichi nuclear power plant in the “difficult-to-return” zone where entry is prohibited. The project seeks to understand the chemical and physical forms of radionuclides in the soil and their horizontal and vertical distribution.

The Japanese government has monitored the state of radioactive contamination in the area near the plant since the 2011 accident by measuring the air dose rate, but scientists can only determine the actual state of contamination in the soil and its chemical and physical forms by direct soil sampling, said Kazuyuki Kita, a professor at Ibaraki University in Japan, who is one of the leaders of the soil sampling effort.

Understanding the radionuclides’ chemical and physical forms helps scientists understand how long they could stay in the soil and the risk they pose to humans, plants and animals, Kita said. The new information could help in assessing the long-term risk of the radionuclides in the soil, and inform decontamination efforts in heavily contaminated areas, according to Kita, one of several researchers will present the team’s preliminary results at the JpGU-AGU joint meeting next week.

Preliminary results show high levels radioactive cesium are still present in the soil near the plant. The levels of radiation are more than 90 percent, on average, of what was found immediately following the accident, according to Kita.

Most of the radiocesium in the soil was found near the surface, down to about 2 centimeters, immediately following the 2011 accident. Five years later, at several sampling points, one-third to one-half of the radiocesium has migrated deeper into the soil, according to Kita. Preliminary results show the radiocesium moved about 0.3 centimeters per year, on average, deeper into the soil and soil samples show the radiocesium has penetrated at least 5 centimeters into the ground at several areas, according to Kita.

The team plans to analyze samples taken at greater depths to see if the radiocesium has migrated even further, he said.

“Most of the radioactive cesium remains after five years, but some parts of the radioactive cesium went from the surface to deeper soil,” he said.

Knowing how much radioactive contamination has stayed on the surface and how deep it has penetrated into the soil helps estimate the risk of the contaminants and determine how much soil should be removed for decontamination. The preliminary results suggest decontamination efforts should remove at least the top 6 to 8 centimeters of soil, Kita said.

The preliminary data also show there are insoluble particles with very high levels of radioactivity on the surface of the soil. Debris from the explosion fused with radiocesium to form small glass particles a few microns to 100 microns in diameter that remain on the ground, according to Kita. The team is currently trying to determine how many of these radiocesium glass particles exist in areas near the nuclear plant, he said.

“We are afraid that if such high radioactive balls remain on the surface, that could be a risk for the environment,” Kita said. “If the radioactivity goes deep into the soil, the risk for people in the area decreases but we are afraid the high radioactive balls remain on the surface.” “

by Nancy Bompey, Global Research


Japan considering using Fukushima soil for public parks — TRUNEWS

” The Japanese government may buy [contaminated soil], using soil from the Fukushima prefecture as landfill for “green areas” and parks, potentially subjecting citizens to dangerous radiation.

The advisory panel of the Environment Ministry on Monday proposed reusing soil that was contaminated during the Fukushima nuclear meltdown of 2011 as part of future landfills designated for public use, Kyodo news reported.

In its proposal, the environmental panel avoided openly using the word “park” and instead said “green space,” apparently to avoid a premature public outcry, Mainichi Shimbun reported.

Following an inquiry from the news outlet, the Ministry of the Environment clarified that “parks are included in the green space.”

In addition to decontaminating and recycling the tainted earth for new parks, the ministry also stressed the need to create a new organization that will be tasked with gaining public trust about the prospects of such modes of recycling.

To calm immediate public concerns, the panel said the decontaminated soil will be used away from residential areas and will be covered with a separate level of vegetation to meet government guidelines approved last year.

In June last year, the Ministry of the Environment decided to reuse contaminated soil with radioactive cesium concentration between 5,000 to 8,000 becquerels per kilogram for public works such as nationwide roads and tidal banks.

Under these guidelines, which can now be extended to be used for the parks, the tainted soil shall be covered with clean earth, concrete or other materials.

Such a landfill, the government said at the time, will not cause harm to nearby residents as they will suffer exposure less than 0.01 mSv a year after the construction is completed.

The Fukushima Daiichi nuclear power plant suffered a blackout and subsequent failure of its cooling systems in March 2011, when it was hit by an earthquake and a killer tsunami that knocked out the facility, spewing radiation and forcing 160,000 people to flee their homes. Three of the plant’s six reactors were hit by meltdowns, making the Fukushima nuclear disaster the worst since the Chernobyl catastrophe in 1986. ”

RT source with TRUNEWS contribution


Japan nearly doubles Fukushima disaster-related cost to $188 billion — Reuters

” Japan’s government on Friday nearly doubled its projections for costs related to the Fukushima nuclear disaster to 21.5 trillion yen ($188 billion), increasing pressure on Tokyo Electric Power (Tepco) (9501.T) to step up reform and improve its performance.

The new estimates could mean a heavier burden for Tepco and other utilities that are helping to pay the costs, and could result in higher power bills for consumers in the long run.

In 2013, the Ministry of Economy, Trade and Industry (METI) had calculated the costs of the Fukushima meltdowns at 11 trillion yen. METI boosted its estimate as industry experts now see decommissioning of the wrecked Fukushima reactors at 8 trillion yen, quadruple an earlier estimate of 2 trillion yen.

The new projection, part of a recommendation from a government panel considering the future of Tepco and Fukushima Daiichi, also calls for 7.9 trillion yen in reparations, up from 5.4 trillion yen, and 5.6 trillion yen for the treatment and storage of contaminated soil, up from 3.6 trillion yen.

“For now, we don’t expect the costs to increase further, but new developments and unforeseen factors mean there is a chance they could go higher,” METI Minister Hiroshige Seko told a press conference.

“Decommissioning technological innovation and a speedier clean up could help reduce costs and it is important that we put effort into that,” he said.

Tepco’s portion of the burden has more than doubled to 15.9 trillion yen from 7.2 trillion yen, while other major utilities will need to pay 3.7 trillion. New electric companies will have to shoulder 240 billion yen.

A METI official said the new projections of the decommissioning costs are an estimate based on certain assumptions and the costs of the Three Mile Island nuclear accident, and does not represent a loss Tepco needs to book. ”

by Yuka Obayashi and Kentaro Hamada


Fukushima’s voluntary evacuees — The Japan Times Editorial

” A citizens’ group supporting the people in Fukushima Prefecture who have fled from their homes in the wake of the March 2011 nuclear disaster has submitted a petition to the Diet with nearly 200,000 signatures asking for the continuation of public housing assistance for the evacuees. The prefectural government announced last year that it plans at the end of next March to terminate the assistance for people who voluntarily left their homes. However, most such evacuees have yet to find new residences.

Halting the housing assistance will place a heavy financial burden on low-income evacuees. Fears also persist over the radioactive contamination in the areas where they lived before the nuclear crisis. Not only the prefecture but the national government, which pays for a large portion of the assistance, should rethink the decision.

As of July, some 89,000 Fukushima people continued to live away from their homes — 48,000 inside the prefecture and 41,000 elsewhere in Japan — after they fled from the dangers posed by the triple meltdowns at Tokyo Electric Power’s Fukushima No. 1 power plant. Some evacuees followed the government’s designation of their hometowns as no-go zones due to the high levels of fallout, while others left their homes on their own out of fear of radiation exposure, particularly for their children, and other reasons even though they lived outside the designated evacuation zones.

The Fukushima Prefectural Government has since been providing housing assistance to the nuclear refugees regardless of whether they stayed within the prefecture — and regardless of whether they were forced out by government order or fled by choice — to cover their rent, including for public housing units owned by local governments. Fukushima has offered the aid by annually renewing the application of the Disaster Relief Law, under which a prefectural government carries out relief measures to residents in the event of a disaster — including supply of food, water, clothing and medical services as well as emergency repairs to damaged homes — with a large portion of the cost coming from national coffers. The national government has shouldered most of the expense of the housing assistance regarding Fukushima.

The prefectural government announced in June last year that it would end the assistance for voluntary evacuees at the end of next March. Gov. Masao Uchibori said the termination is aimed at prompting the evacuees to return to their original homes and at helping promote their sense of self-reliance. He explained that living conditions in the prefecture have improved with the development of public infrastructure and progress in the cleanup of radiation-contaminated soil.

According to a prefectural report based on a survey conducted in January and February, the decision will halt housing assistance for 12,436 households. Of the 3,614 households that voluntarily evacuated but remained in the prefecture, 56 percent have not yet found a place where they can live once the assistance is halted. The corresponding figure for the 3,453 such households living outside the prefecture is much higher — nearly 78 percent. The prefecture should pay serious attention to these findings. Some families may not be able to find and pay for a new home, although the prefecture reportedly plans to offer small subsidies for low-income and single-mother households after the large-scale assistance is ended.

The voluntary evacuees are confronted with various difficulties, both financial and psychological. The amount of compensation they received from Tepco is much smaller than that paid out to evacuees from the no-go zones. They also do not receive the monthly damages of some ¥100,000 that Tepco doles out to cover the mental suffering of those from the designated evacuation zones. Many of them face hardships ranging from the loss of their former jobs to separation from family members, long-distance commuting and divorces of couples due to differences over evacuating. The loss of housing assistance will likely result in even more hardships, both financial and emotional.

Many of the voluntary evacuees remain reluctant to go back to their hometowns for a variety of reasons, including the persistent fear of radiation, the desolate conditions of their original homes, and anticipated low levels of medical and other services in their former communities. The national government says it is safe for evacuees to return if the annual cumulative dose in the area is 20 millisieverts (mSv) or less, but that level is much higher than the legal limit of 1 mSv allowed for people in ordinary circumstances. In Ukraine, hit by the 1986 Chernobyl catastrophe, people are required to migrate if the annual cumulative dose in their area is 5 mSv or more and have “the right to evacuate” if the rate is between 1 mSv and 5 mSv. The national government and Fukushima Prefecture need to address why many of the volunteer evacuees are reluctant to return.

The national government may want to highlight the reconstruction in areas devastated by the March 2011 Great East Japan Earthquake and tsunami as well as the Fukushima nuclear disaster when Tokyo hosts the 2020 Summer Olympic Games. However, this should not result in the premature termination of vital relief measures for the affected people or untimely lifting of the designation of danger zones hit by the nuclear crisis. The government, which has sought to reactivate the nation’s nuclear power plants idled since the 2011 disaster, should understand why the evacuees felt they had to flee from their homes in the first place. It should not give up its duty of adequately helping the disaster victims. ”