Fukushima residents exposed to far less radiation than thought


bill barilko
#1
This news is fascinating, intriguing and personally satisfying I've been saying all along that the chicken littles were FOFS (external - login to view)



Citizen science usually isn’t this personal. In 2011, roughly 65,000 Japanese citizens living near the crippled Fukushima Daiichi Nuclear Power Plant started measuring their own radiation exposure in the wake of the Tōhoku earthquake and tsunami. That’s because no one, not even experts, knew how accurate the traditional method of estimating dosage—taking readings from aircraft hundreds of meters above the ground—really was. Now, in a first-of-its-kind study, scientists analyzing the thousands of citizen readings have come to a surprising conclusion: The airborne observations in this region of Japan overestimated the true radiation level by a factor of four.

“The work [these] researchers are doing is extremely important … [because] it is logistically challenging to sample and monitor every potentially exposed person,” says Kathryn Higley, a certified health physicist at the School of Nuclear Science and Engineering at Oregon State University in Corvallis.

It’s rare to monitor individual radiation exposure after a nuclear power plant accident. In some cases, regions are simply evacuated. In others, the cost and difficulty of handing out personal sensors—called dosimeters—is just too much. The few studies that have gathered individual readings in places like Chernobyl in Ukraine have also suffered limitations. Most target only small populations, and many are conducted far from the disaster site or long after the accident. Using aircraft is often easier, cheaper, and faster.

But in Date, Japan—just 60 kilometers from the six-reactor Fukushima Daiichi complex—local officials started a radiation-monitoring campaign within a few months of the accident. Mayor Shoji Nishida was one of the main supporters. He explained at a 2014 meeting of the International Atomic Energy Agency that his city was never ordered to evacuate, despite surveys revealing radiation levels similar to those in nearby towns that were evacuated. “We decided that we should not depend on the national government and that we had to take our own independent actions,” Nishida said at the meeting. He ordered Date to begin its own decontamination efforts and to monitor individual radiation exposure, allocating 1 billion yen of city funds to the project in May 2011.

Under Nishida’s mandate, pregnant women and children younger than 16 were the first to receive a dosimeter, a candy bar–sized sensor that measures gamma rays. These high-energy electromagnetic waves, emitted by radioactive elements like cesium, can damage DNA and cause cancer. After roughly 9000 dosimeters had been distributed to children and expectant mothers, Date officials expanded the monitoring project: By 2012 almost all of Date’s roughly 65,000 inhabitants had been given one. Residents returned the dosimeters every 3 months for analysis; more than 52,000 residents participated in the survey for at least one year.

Meanwhile, six airborne radiation surveys of Fukushima Prefecture were conducted by the national government. Sensors attached to helicopters measured radioactive cesium on the ground, and researchers used scaling laws to convert that data to expected doses at ground level. Because many people spend most of their time indoors, protected by radiation-absorbing buildings, government scientists further assumed that just 60% of that radiation actually reached most subjects. That estimate was based on the standard assumption that people spend 8 hours outdoors and 16 hours indoors each day.

Now, Makoto Miyazaki, a radiologist at Fukushima Medical University, and Ryugo Hayano, a University of Tokyo physicist, have taken the thousands of data points from the Date dosimeters and compared them with the ground-level estimates from the helicopter data. The scientists concluded that actual radiation doses were roughly 15% of what the helicopters were measuring, scaled to ground level, they reported last month in the Journal of Radiological Protection. That’s four times less radiation than what the Japanese government was previously assuming.

The researchers give several reasons for the large difference. Chief among them: “Residents [are] not staying outdoors for 8 hours each day,” Miyazaki says. He hopes these results will help other researchers better predict actual radiation doses—and therefore potential health effects—based on rapid airborne surveys. A better estimate of individual radiation doses might also allow displaced people to return to their homes sooner, Higley notes.

For Date residents, it’s good news that radiation levels are lower than expected. But the result comes with a less-than-silver lining: Some of the region’s expensive, time-consuming decontamination efforts—such as the removal of topsoil and tree bark—might not have been necessary.
 
Johnnny
#2
Has the corium from the Dachaii Reactor been contained is the real question...
 
darkbeaver
#3



Bill, why is that called Science?
 
Danbones
#4
Home » News » Japan Declare Crisis As Fukushima Reactor Falls Into Ocean
Japan Declare Crisis As Fukushima Reactor Falls Into Ocean

Scientists at the Fukushima Daiichi nuclear plant in Japan have declared a state of emergency as one of the reactors is on the verge of falling into the ocean.

Lethal levels of radiation have been detected around the site which scientists say stems from a hole caused by melted nuclear fuel.
Japan Declare Crisis As Fukushima Reactor Falls Into Ocean (external - login to view)

if true, sceddy stuff

..and they are psy ants
 
Johnnny
#5
^--- that's what im saying... I haven't seen anything substantial enough to be convinced that the corium is contained... I'm pretty sure water from the ocean has access to it... For the amounts we were detecting on our Pacific Coast it is reasonable to conclude that there is still a lot of clean up left.
Last edited by Johnnny; Feb 3rd, 2017 at 06:47 PM..
 
Danbones
#6
I wish this was a thread about the radiation from medical tests
so I could use the line:"OH SH!T! We re all going to Dye!"

anyway, they found a fukushima radio active salmon in the Kootenay area I think it was, a couple weeks ago
 
Johnnny
#7
Published today and Gizmodo has a decent rating

Radiation Levels Are Soaring Inside the Damaged Fukushima Nuclear Plant (external - login to view)

Radiation Levels Are Soaring Inside the Damaged Fukushima Nuclear Plant

Quote:

Problem is, the interior condition of the plant is still a big mystery


Fake News Everywhere
 
darkbeaver
#8
The corium is perfectly harmless ,you can drink it. Fish do.
 
Johnnny
+1
#9  Top Rated Post
Quote: Originally Posted by darkbeaverView Post

The corium is perfectly harmless ,you can drink it. Fish do.



wwwyoutubecomwatchvJMaEjEWL6PU

 
Danbones
#10
blotchfish always swim upsidedown
 
Johnnny
+1
#11
5 days ago i was saying the same thing as most other people were....



Radiation levels inside Fukushima too high for robot - Technology & Science - CBC News

Quote:

Radiation levels inside Fukushima too high for robot

The robot was to inspect and clean a passage before another robot does a fuller examination

A remote-controlled cleaning robot sent into a damaged reactor at Japan's Fukushima nuclear plant had to be removed Thursday before it completed its work because of camera problems most likely caused by high radiation levels.

It was the first time a robot has entered the chamber inside the Unit 2 reactor since a March 2011 earthquake and tsunami critically damaged the Fukushima Da-ichi nuclear plant.

Tokyo Electric Power Co. (TEPCO) said it was trying to inspect and clean a passage before another robot does a fuller examination to assess damage to the structure and its fuel. The second robot, known as the "scorpion," will also measure radiation and temperatures.

Last edited by Johnnny; Feb 9th, 2017 at 02:57 PM..
 
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