nuclear-news

The ostriches of Fukushima and what they told us about radiation

An ostrich runs by a bicycle with rusted chain in November 2011 in Tomioka, Fukushima Prefecture.

September 30, 2019

Of all the astonishing sights that unfolded in the aftermath of the 2011 nuclear crisis, the one that took the biscuit was ostriches roaming in one of the towns hosting the stricken Fukushima No. 1 nuclear plant.

Farmers in the area were forced to abandon their livestock due to mass evacuations ordered after the triple meltdown at the plant, and many departing residents also left their pet dogs and cats to fend for themselves as evacuation shelters would not accept animals.

An area of 20 kilometers radius of the plant was declared off-limits immediately after the accident, and the creatures left behind became feral.

It was not uncommon for later visitors, wearing protective gear because of high radiation levels, to see cattle and pigs wandering through the streets of Futaba and Okuma, the now-empty towns that co-hosted the nuclear power plant.

Masato Kino, now 50 and an economy ministry official in charge of decommissioning and radioactive water issues, returned to the area on Sept. 23, 2011, six months after the magnitude-9.0 earthquake that hit the northeastern Tohoku region, triggered devastating tsunami which in turn knocked out cooling systems at the plant and caused the nuclear crisis.

He was flabbergasted to come across an ostrich peeping into a private home from its yard in Okuma, Fukushima Prefecture.

That day, Kino, who at the time also served as an official of the government’s local nuclear accident control headquarters, was accompanying returning evacuees on their visits to tend to family graves.

The ostrich was observed as Kino and three colleagues were driving back.

Although he wondered what the ostrich was doing there, he had the wherewithal to scatter dog food out of the car window for the big bird to tuck into.

Each time Kino came across dogs and cats in the restricted area, he would scatter dog food he had prepared in his car. He saw himself as a “lonely volunteer.”

It later emerged that the bird had escaped from an ostrich park in Okuma, situated 7 km from the Fukushima No. 1 plant. The facility was opened in 2001 by Toshiaki Tomizawa, now 81, a former assemblyman of Futaba, Fukushima Prefecture, to draw tourists to the region.

KEEPING OSTRICHES ALIVE

The ostrich park had nine birds when it opened. But the figure quickly rose to 30 and a restaurant was set up on the premises to serve ostrich meat. Soon after that, the nuclear crisis struck.

Following the disaster, Tomizawa moved to Saitama Prefecture to live with his daughter.

When he returned to the park three months later, more than half of the ostriches had died. The remaining 10 or so became feral in the no-entry zone.

Many sightings of the species were reported, drawing complaints from people, who on temporary return visits, were frightened to encounter ostriches near their homes.

Tomizawa trapped six ostriches in late 2011 with help from the farm ministry and other parties.

Farm ministry officials told him to kill them, so Tomizawa contacted ornithologists and other experts to find ways to “make full use of them.”

One of them, Yoshihiro Hayashi, director-general of the National Museum of Nature and Science, who was involved in research on animals affected by the disaster, asked ornithologist Hiroshi Ogawa, an animal husbandry professor at the Tokyo University of Agriculture, for advice.

In response to the offer, Ogawa began examining how the six ostriches trapped in January and May 2012 had absorbed radioactive substances.

It was assumed the feral birds feasted on contaminated plants, bugs and rainwater, so Ogawa tried to see if there was a way of reducing radioactive substances in their bodies by feeding them radiation-free dog food and well water.

Although the ostriches should have been kept in an area where radiation levels were significantly lower, transferring animals from the no-entry zone was prohibited. As a result, they were cared for at Tomizawa’s stable in the restricted area.

The birds displayed a radiation reading of 4.6 microsieverts per hour when the research started in March 2012. To lower the figure, Tomizawa frequented the stable from Saitama Prefecture once every one or two weeks to give them clean food and water.

The six ostriches were finally euthanized and dissected one month, two and a half months, nine and a half months and 14 months after they were caught, respectively, so that changes in radiation levels in their bodies could be analyzed.

SIGNIFICANT FINDINGS

The results showed that almost no radioactive substances other than radioactive cesium derived from the Fukushima crisis remained in their bodies, meaning that they were free from strontium and other more dangerous materials.

According to the findings, cesium is more easily absorbed through skeletal muscles than organs. It turned out to be difficult to rid muscle tissue of the substance.

The cesium reading began dropping nine and a half months after the birds were captured, which suggests the radiation level will drop if the animals are kept under low-radiation conditions.

“The research provided insights into internal radiation exposure and drops in the radiation level of wild animals,” Ogawa said.

Tomizawa, who still lives in Saitama Prefecture, described his ostrich park as having “reported successive losses and posing many problems.”

But Tomizawa also has good memories of that time. Because the overseas media gave the escaped ostriches more extensive coverage than in Japan, Tomizawa was treated like a TV celebrity when he visited Indonesia, Australia and elsewhere after the disaster.

“I met many people thanks to the ostriches,” Tomizawa said. “I feel things worked out right in the end.”

OSTRICHES AT NUCLEAR PLANT

Tomizawa decided to open the ostrich park in 2001, two years after Tokto Electric Power Co. began keeping four ostriches at its Fukushima No. 1 plant.

The reasoning behind TEPCO’s bizarre move was that the high productivity rate of the bird species resembled that of reactors.

An ostrich reaches adulthood within two years on a meager diet of wheat and corn, yet grows to 2 meters tall and weighs more than 100 kilograms. A female ostrich lays eggs for 40 years, starting from the age of 2.

“This feature is similar to the characteristic of nuclear power plants that can generate a lot of electricity from a small volume of uranium fuel,” reads a promotional pamphlet issued by plant operator TEPCO around that time.

As ostriches are called Strauss in German, TEPCO said it wanted the Fukushima No. 1 nuclear power plant to be nicknamed “Strauss power plant” in the document.

However, those efforts appear to have fallen flat as few TEPCO officials were aware of the nickname.

TEPCO hired a veterinarian to look after the ostriches, but as the species is ill-tempered it was decided that the three ostriches still alive should be sent to Tomizawa to look after.

While a TEPCO public relations official said the utility could not offer a detailed explanation as to when and why the utility stopped keeping the birds “due to an absence of relevant documents,” at least one thing can be said about the project: what it touted as “highly productive” turned out–just like the nuclear power plant–to be difficult to deal with.

http://www.asahi.com/ajw/articles/AJ201909300003.html?fbclid=IwAR18JGMk7r6HVK19KMoYYskcS9lpul-Mp2urIiZV1uOq6CCTcXJWkndOyNI

October 7, 2019 Posted by dunrenard | fukushima 2019 | Fukushima Prefecture, Fukushima Radiation | Leave a comment