Despite What You Read, Radiation Levels at Fukushima Daiichi Aren't ‘Soaring’

Fukushima Sea Water Sampling-3

Caption: The damaged Fukushima Daiichi Nuclear Power Station as seen during a sea-water sampling boat journey, 7 November 2013. International Atomic Energy Agency (IAEA) marine monitoring experts were sent to Japan to observe sea water sampling and data analysis. Photo credit: IAEA/David Osborn

A recent news release from a Japanese power utility has generated a number of headlines across the Western media about “soaring radiation levels in Fukushima.” That would be frightening news if true, but it turns out that saying radiation levels are suddenly spiking in Fukushima isn't entirely accurate.

TEPCO is the nationalized electric utility that operated the Fukushima Daiichi nuclear power plant. On January 31, TEPCO issued a news release and information package that described the successful efforts to send a robot beneath the primary containment vessel of Unit 2. Unit 2 was one of three reactors at Fukushima Daiichi that experienced a meltdown in March 2011, following a massive earthquake and subsequent tsunami wave that knocked out power to the complex (a timeline of the disaster can be found here).

Little is known about what happened to the reactor fuel assemblies following the nuclear accidents. It has been theorized that fuel assemblies in all three reactors melted through the reactor containment vessels and onto the concrete pedestal of the primary containment building.

However, radiation levels are so high that it has been impossible to use existing technology to explore the highly radioactive zone where the molten fuel assemblies are thought to remain. A sensor was briefly inserted into the Unit 2 containment vessel in 2012 and detected 73 sieverts, but radiation at that level quickly disables the electronics of any robotic device sent in to investigate.

It has taken TEPCO since 2012 to develop new technologies that can withstand the radiation. So, TEPCO's January 31 news release marked something of a milestone in the quest to decommission the Fukushima nuclear reactors because it represented the first time the radiation in the highly radioactive area below a reactor had been accurately measured.

Radiation levels taken out of context

However, much media coverage failed to frame stories around that context and instead focused on the high radiation levels measured near the pedestal of the Unit 2 reactor complex.

According to a PDF handout from TEPCO, radiation levels at one location in Unit 2 measured 530 sieverts. A sievert is a unit measurement for a dose of radiation absorbed over time. One sievert will cause illness if absorbed all at once; eight sieverts will result in death, even with treatment. A dose of 530 sieverts, totally unexpected by the robot's designers, would likely cause instant death and would disable a robot after a couple of hours.

The same probe measured a lower radiation reading of 20 sieverts in an adjacent space, but Western media attention zeroed in on the 530 sieverts number. Moreover, several news outlets characterized the findings as indicating that radiation levels are “soaring” at the Fukushima plant — despite this being the first time that technology has been able to accurately measure radiation in that area of Unit 2, and despite some evidence showing that radiation levels are generally falling in the area surrounding the Fukushima nuclear plant itself.

The Guardian newspaper's headline read, “Fukushima nuclear reactor radiation at highest level since 2011 meltdown“, while popular science blog Gizmodo noted, “Radiation Levels Are Soaring Inside the Damaged Fukushima Nuclear Power Plant.” While both publications were not the first to break the story in the English-language media, both are identified by Google News as being “highly cited”, and may have influenced how other news organizations reported on the Fukushima radiation readings.

Screencap of Google News results for “Fukushima Daiichi.” The Guardian and Endgadget articles are identified by Google News as being “highly cited.”

The Guardian story was shared on social media. Many of the tweets, such as the one below, discussed the high levels of radiation observed at Fukushima, while disregarding the context where and how the readings were made.

US commentators put an American spin on Fukushima news

By February 8, the story was gaining steam, with rumours of another environmental calamity coming while the media looked the other way. US-based outlets such as InfoWars, the influential website devoted to conspiracy theories, and the more mainstream Fox News had picked up the story of “unimaginable” levels of radiation at the Fukushima nuclear power facility. The Fox News story quoted Adam Housley, a journalist who had covered the nuclear accident in 2011, as saying, “To put this in very simple terms. Four sieverts can kill a handful of people.”

Housley did not try to put the source of the high radiation levels in context, and instead sent out this tweet:

The Fox News story was quickly re-tweeted by Joe Walsh, a far-right pundit and talk radio host, who provided a partisan spin to the story:

The story of radiation levels in Fukushima continued to be viewed through a partisan lens. Lou Dobbs, who hosts a program on Fox Business Network, also suggested the “mainstream media” was ignoring another potential disaster. A follower then, in a reply that was favorited and retweeted dozens of times, linked the perceived disinterest in the story by the media with attacks on US President Donald Trump and global warming:

Adding more disinformation to the Internet echo chamber

While some of the conversations online focused on a supposed impending calamity from the high radiation readings in Fukushima, others injected wrong information into the mix.

Global Research, a Canada-based website that has been accused of spreading conspiracy theories, tweeted a misleading image to accompany its story on the high radiation levels at Fukushima Daiichi. The photograph shows a massive fire at the Cosmo petrochemical plant in Ichihara, Chiba in 2011. While the fire was caused by the massive 2011 earthquake, it has nothing to do with the Fukushima nuclear disaster:

Others used the increased interest in radiation levels at Fukushima to share highly misleading images that have circulated online ever since the disaster occurred in 2011. For example, Twitter user @MikeMtk63 included a map created in 2012 by environmental consultancy ASR:

ASR's map has been shared hundreds of times over the past six years, but always out of context. In its explanation of the map, ASR says (in all caps), “THIS IS NOT A REPRESENTATION OF THE RADIOACTIVE PLUME CONCENTRATION.” Instead, ASR says the map is intended to illustrate where free floating material (fish larvae, algae, phytoplankton, zooplankton, etc.) present in the sea water near the damaged Fukushima Daiichi nuclear power station plant would have dispersed to in the days following the earthquake on March 11, 2011.

Another Twitter user tweeted a financial news blog Zero Hedge story that featured another widely shared image that supposedly shows radioactive contamination of the Pacific Ocean from the Fukushima disaster:

The image is in fact from the US National Oceanic and Atmospheric Administration (NOAA), and is intended to represent tsunami and wave activity all across the Pacific Ocean following the March 11, 2011 megaquake that struck Japan. Once again, the image has nothing to do with the Fukushima nuclear accident.

‘No, radiation levels at Fukushima Daiichi are not rising’

SafeCast, a volunteer-driven grassroots organization that collects environmental data, noticed the news stories about a sudden spike in radiation levels at Fukushima. In a blog post called “No, Radiation Levels at Fukushima Daiichi Are Not Rising,” SafeCast pointed out the reason why the radiation levels measured in late January were so high was because it was the first time the area had been explored since the accident:

It must be stressed that radiation in this area has not been measured before, and it was expected to be extremely high. While 530 Sv/hr is the highest measured so far at Fukushima Daiichi, it does not mean that levels there are rising, but that a previously unmeasurable high-radiation area has finally been measured.

SafeCast got its start in 2011 in the weeks and months following the Fukushima nuclear disaster, when no one was really sure just how much radioactive contamination was occurring. While volunteers monitored and posted readings from all over Japan, since 2011 the initiative has since gone global.

The organization also stated that, according to its sensor network, radiation levels near Daiichi appear to be steadily declining. However, SafeCast says the main lesson from the January exploration of the reactor pedestal is:

The process of removing melted fuel debris from the damaged reactors at Fukushima Daiichi is expected to take decades, and these recent findings remind us once again that TEPCO has little grounds for optimism about the challenges of this massive and technically unprecedented project.


  • charlesjannuzi

    Where did the ‘unimaginable’ remark come from? How about like what this WaPo article cites.

    And Japan’s National Institute of Radiological Sciences said medical professionals had never even thought about encountering this level of radiation in their work.

  • Darwin Award Giver

    If radiation levels are dropping, why did tepco say it would take 4 decades to decommission the plant? Why did they say the site under reactors 1, 3, and 4 are experiencing “uncontrollable fission”? Why did tepco release a statement of that 20-40 trillion becquerels of tritium has been released into the atmosphere? Your whole premise was that people are being hyperbolic, but in actuality, they are responding accordingly to a grave situation–leading scientist said said it’s the worst disaster mankind has ever faced. Not only that, they even said that the reading of 530 Sv/Hr isn’t actually an accurate reading. This is the highest reading because this is the first time they’ve been close enough to get a reading that high–the reading at the core will dwarf the 530 Sv/Hr, because the robots will never be close enough to do anything. The reading of 530 Sv/Hr is still unimaginable, we don’t even have the technology to deal with that.

    Look into Japan’s 2020 olympics. Their government has good reason to lie about it. Remember, due to hubris, Japan didn’t even declare it a super disaster, until they came out asking the rest of the world for help. Abe telling people to smile and the radiation can’t hurt you. Black out on all information on fukushima at the time it happened. You see the kids around Fukushima have thyroid issues, they have to cull the radioactive boars near the exclusion zones, and we have assholes like you trying to downplay a grave situation. Japan is now forcing people back into exclusion zones, because the subsidies for their temporary housing is up. Now they have to move back into homes with ionizing radiation, or face going homeless. You’re a pretentious, masochistic, negligent, destroyer of the environment. Being cynical of other outlets on their reporting on a situation, downplaying the situation yourself, and having a very nebulous understanding of it overall. I don’t trust the Japanese government, ’cause they’ve been lying about this for too long.

Join the conversation

Authors, please log in »


  • All comments are reviewed by a moderator. Do not submit your comment more than once or it may be identified as spam.
  • Please treat others with respect. Comments containing hate speech, obscenity, and personal attacks will not be approved.

Receive great stories from around the world directly in your inbox.

Sign up to receive the best of Global Voices!

Submitted addresses will be confirmed by email, and used only to keep you up to date about Global Voices and our mission. See our Privacy Policy for details.

Newsletter powered by Mailchimp (Privacy Policy and Terms).

* = required field
Email Frequency

No thanks, show me the site