Helen Caldicott - Crisis Without End

On March 11, 2011, an earthquake measuring nine on the Richter scale struck off the east coast of Japan. Within days, the ensuing tsunami had induced the meltdown of three of the six nuclear reactors at the Fukushima Daiichi nuclear power plant.

During the earthquake, the external power supply was lost to the reactor complex. The pumps that circulate up to one million gallons of water per minute to cool each reactor core ceased to function. Emergency diesel generators situated below the plants kicked in, but these were soon swamped by the tsunami. Without cooling, the radioactive cores in Units 1, 2, and 3 began to melt within hours. Over the next few days, all three cores (each weighing up to one hundred tons) melted their way through six inches of steel at the bottom of their reactor vessels and oozed their way onto the concrete floor of the containment buildingsa fact that the Japanese government and Tokyo Electric Power Company (TEPCO), the power plant operator, continued to deny for months after the disaster. At the same time the zirconium cladding covering thousands of uranium fuel rods reacted with water to create hydrogen, which initiated hydrogen explosions in Units 1, 2, 3, and 4.

Massive quantities of radiation escaped into the air and water: three times more noble gases (argon, xenon, and krypton) than at the Chornobyl nuclear power plant accident in 1986, and huge amounts of other volatile and nonvolatile radioactive elements, including cesium, tritium, iodine, strontium, silver, plutonium, americium, and rubidium.

Fukushima is now described as the greatest industrial accident in history.

The Japanese government considered plans to evacuate 35 million people from Tokyo as other reactors, including four at Fukushima Daini, several miles along the coast from Fukushima Daiichi, were also at risk. Meanwhile, thousands of people fled the area around the smoldering reactors, but they were not notified where the radioactive plumes were traveling despite the fact that there was a system in place to track the plumes. As a result, people fled directly into regions with the highest radiation concentrations, where they were exposed to high levels of whole-body external gamma radiation, inhaling radioactive air and swallowing radioactive elements.

Administering inert potassium iodide to the exposed population would have blocked the uptake of radioactive iodine in their thyroid glands. Unfortunately, it was not supplied, except in the town of Miharu, where there was a conscientious mayor. Prophylactic iodine was, however, distributed to the staff of Fukushima Medical University in the days following the accident, after extremely high levels of radioactive iodine1.9 million becquerels per kilogramwere discovered in leafy vegetables near the university.

The Fukushima disaster is not over and will not end for many millennia. The radioactive fallout, which has covered vast swaths of Japan, will remain toxic for hundreds of thousands of years. It cannot simply be cleaned up, and it will continue to contaminate food, humans, and animals. It is unlikely that the three Fukushima Daiichi reactors that experienced total meltdowns will ever be disassembled or decommissioned. TEPCO claims such a massive undertaking will take them at least thirty to forty years. The International Atomic Energy Agency (IAEA) predicts that it will be more than forty years before any progress can be made because of the dangerous levels of radiation at these damaged reactors.

This accident is identical to the Chornobyl catastrophe in its medical implications. The Fukushima meltdowns will induce an epidemic of cancer as people ingest radioactive elements. The single meltdown and explosion at Chornobyl contaminated 40 percent of the European landmass. Already, according to a 2009 report published by the New York Academy of Sciences, over one million people have perished as a direct result of that catastrophe. Large parts of Europe will remain radioactive for hundreds of years, as will now be the case in Japan.

In assessing the impact of the Fukushima disaster on Japan and on the planet, and in assessing the safety of nuclear power overall, it is imperative to understand and evaluate the biological and medical consequences of exposure to the kinds of radioactive elements that are released during an accident at a nuclear power plant.

Fact One: No dose of radiation is safe. Each dose received by the body is cumulative and adds to the risk of developing malignancy or genetic disease.

Fact Two: Children are ten to twenty times more vulnerable to the carcinogenic effects of radiation than adults. Females tend to be more sensitive than males, while fetuses and immunocompromised patients are also extremely sensitive.

Fact Three: High doses of radiation received from a nuclear meltdown (or from a nuclear weapon explosion) can cause acute radiation sickness, including hair loss, severe nausea, diarrhea, and bleeding. Reports of these illnessesparticularly among childrenappeared within the first few months after the Fukushima accident.

Fact Four: The latent period of carcinogenesis and the incubation time for leukemia is five to ten years. For solid cancers, it is fifteen to eighty years. It has been shown that all modes of cancer can be induced by radiation exposureboth external and internalas well as over six thousand genetic diseases caused by mutations in the eggs and sperm, which are passed on to future generations.

As we increase the level of background radiation in our environmentfrom medical procedures and X-ray scanning machines at airports to radioactive materials escaping from nuclear reactors and nuclear waste dumpswe will inevitably increase the incidence of cancer and genetic disease in future generations. A disaster such as what occurred at the Chornobyl and Fukushima nuclear power plants exponentially increases the risk of both cancer and genetic disease in exposed populations.

There are five forms of ionizing radiation:

X-rays are electromagnetic and cause mutations the instant they pass through a human body. X-rays are not emitted by radioactive materials, only from man-made medical equipment.

Gamma rays, also electromagnetic, are emitted by many of the radioactive materials generated in nuclear reactors and by some naturally occurring radioactive elements in soil.

Alpha rays are particulate and composed of two protons and two neutrons emitted from uranium atoms and other elements generated in reactors, such as plutonium, americium, curium, and einsteinium. Alpha particles travel a very short distance in the human body. They cannot penetrate the layers of dead skin in the epidermis to damage living skin cells. But when these radioactive elements enter the lungs, liver, bones, or other organs, they transfer a large dose of radiation over a long period of time to a very small volume of cells. Although most of these cells are killed, some on the edge of the radiation field remain alive. They are often mutated, potentially causing cancer. Alpha emitters are among the most carcinogenic materials known.

Beta rays, like alpha rays, are also particulate. A beta ray is a charged electron emitted from a radioactive element, such as strontium-90, cesium-137, and iodine-131. The beta particle is light in mass, travels farther than an alpha particle, and also is mutagenic.