Aieee, I went to eat sushi last night and I have to admit, I was peering at the tuna anxiously for signs it might glow on the dark if they turned out the lights. After reading that tuna being caught off the coast of California were all tainted with radioactive Cesium from the Fukushima Dai-ichi meltdown in 2011, I was kind of worried. To eat, or not to eat?
In the interests of not giving up tuna (sob!), I did a little ferreting around. Here’s what I found:
What totally scared me
News reports said that tuna caught all the way across the ocean from Fukushima were contaminated with ten times more radioactive Cesium-134 and -137 than before the Fukushima Dai-ichi nuclear plant meltdown in 2011. There’s no doubt that the elevated fish radioactivity is a result of growing up in the reactor meltdown water that barreled into the ocean after the 3/11 tsunami – they tested tuna from the Atlantic Ocean and tuna that had migrated to California before the 3/11 earthquake and didn’t find any Cesium at all. So now the release of radioactive water (that is still leaking into the ocean from the damaged reactor, according to this weeks’ additional outraged headlines) is contaminating the food supply beyond Japan.
Aieeee! Do I have to give up tuna forever? Nooooo!
Okay, calm down. Maybe it’s not actually as bad as it seems at first glance. Surely there must be some article that will tell me just how many pieces of chu-toro I can pound down before I grow three heads. Beavering about some more, I found a couple of articles that said hey, don’t get your knickers in a twist, the amount of cesium in a serving of the recently-caught glow-in-the-dark tuna is equal to what you get from eating 1/20th of a banana. (Bananas always contain some radioactive potassium. Who knew? O_O)
Whew. So it’s not really that bad, right?
Tra la tra la, pass the soy sauce!
But wait! There’s more.
First of all, the fish they tested were two to three years old. They’d been majorly dosed with radioactive water from the initial meltdown in their formative years, then they grew somewhat less radioactive as they got bigger and migrated to untainted parts of the ocean. Also, the Cesium-134 lodged in their tissues has a half-life of 2.0652 years, so it decayed somewhat from the time the fish were originally contaminated.
But what will happen when the plume of radioactive water that’s still leaking into the ocean from the damaged Fukushima reactor at the rate of 300,000 litres a day spreads throughout the Pacific, like these maps predict?
Or, more specifically, look at the dispersion map from researchers at the University of Hawaii, who used a more detailed model of the Pacific’s water movement patterns:
The U of H guys say the radioactivity won’t spread uniformly through they water. It will tend to collect in certain places, like off Alaska’s Aleutian Islands, and next to the west coast of America. (Surf’s up dude. How do you like my new lead-lined wetsuit?)
So, what will happen to my future sashimi if radioactive water continues to sluice into the ocean from Fukushima Dai-ichi, adding to the plume from the earthquake that’s spreading across the Pacific? What if the tuna are exposed to radiation their whole lives, not just near Japan,where they hatch?
I guess we’ll find out when the results of a study planned for this summer come out. Researchers are going to measure the levels in fish that have been more constantly exposed to radioactive seawater their whole lives.
In the meantime, I wish the Japanese government would stop concentrating so hard on luring the 2020 Olympics to town, and more on getting Fukushima Dai-ichi shut down and cleaned up for good. Because come on, guys, I don’t look good in lead.
Jonelle Patrick writes novels set in Tokyo