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188

Japan says no radioactivity found in Fukushima fish, Kyodo reports (www.reuters.com)

submitted 1 year ago by [email protected] to c/[email protected]

40 comments fedilink hide all child comments

Japan's fisheries agency said on Saturday fish tested in waters around the wrecked Fukushima nuclear plant did not contain detectable levels of the radioactive isotope tritium, Kyodo news service reported.

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[–] [email protected] 87 points 1 year ago* (last edited 1 year ago) (6 children)

I work with radiation. Radiation is hard for lay people to understand, and they are all afraid of it.

The technical language in this article is not helpful for lay people, but it is for me.

You get a much larger dose of a much worse kind of radiation exposure by eating a banana than drinking a liter of this seawater.

And things like Brazil nuts, your basement, living at altitude or near certain kinds of rocks, flying, smoke detectors, or dental X-rays are much, much worse.

Not to mention higher dose medical procedures (CT, PET, SPECT, and radiation therapy). Those, however, are borderline dangerous, but there's a trade-off. Your radiation therapy may lead to secondary cancer down the line, but your primary cancer is killing you right now.

These articles also need to mention that the actual experts -- the people who know what they're doing and understand this -- agree this is the best and safest course of action. I'm not that kind of person, but I know plenty of them. I assure you, they are very cautious.

[–] [email protected] 28 points 1 year ago (1 children)

Thank you. Ppl hear radiation and immediately think of glowing fuel rods, and the three eyed fish from the Simpsons. Uv rays are more dangerous than this sea water

[–] [email protected] 14 points 1 year ago* (last edited 1 year ago)

Oh yeah. I didn't even think about uv.

Let's include "going to the beach to collect said seawater during the day" to my list.

Edit: and driving to the beach.

[–] [email protected] 3 points 1 year ago* (last edited 1 year ago) (1 children)

Isn't the problem as much with the radiation itself as consuming radioactive elements that will stay in your body likely to the rest of your life and provide radiation from the inside?

[–] [email protected] 4 points 1 year ago* (last edited 1 year ago) (2 children)

Tritiated water mostly has a 12 day lifespan in your body, at max. Some of it may be used as tritium instead of normal hydrogen in putting things together, but it's not like other nasty radionuclides.

[–] [email protected] 4 points 1 year ago (2 children)

That 12 days is not a half life, but it is how long it stays in the body before you pee it out. This only matters if you had a single incident of drinking the water or eating contaminated food not if you are constantly exposed to it then each time you consume affected foods you know it stays with you for about 12 days and small part of it stays with you forever as your body doesn't see the difference between tritium and hydrogen, so it will be happy to use the radioactive version, which could increase your chances of cancer as well as your future generations.

[–] [email protected] 3 points 1 year ago (1 children)

I don't want to be insulting, but what you've described is exactly what a half life is.

But like I said, drinking a liter of this water is much less dangerous radiologically than eating a banana, and drinking a liter of sea water is not going to be good for you either.

[–] [email protected] 2 points 1 year ago (1 children)

When I said half life, I made a mental shortcut that it degrades into harmless compounds.

The 12 days just means how long the body keeps most of tritium.

You are talking how much radiation the water causes and that it is smaller than radiation from banana, and I'm talking that this "banana" stays in your body for 12 days and part of it your body integrates by replacing your hydrogen with its radioactive counterpart.

You work with radiation, but this isn't just about radiation, but also involves organic chemistry and metabolism.

[–] [email protected] 5 points 1 year ago

I think the gap between you two is that you are describing the "biological half life" of tritium while using the term "half life" to exclusively refer to the "physical half life". In Health Physics the distinction between the two is very important and generally once you start talking about the effect on people it is best practice to always clarify which one you're talking about.

The biological half life of tritium is also a little more complicated than "12 days", it depends on the form it is in. If inhaled as water vapor it almost immediately gets re-exhaled, whereas if drunk as liquid water it can be ~10 days depending on the person's water turn over (<8 hours if dialysis is used for treatment following extreme exposure) ... tritiated water is one of the few things that you can speed up the elimination of by drinking more water. For tritium bound up in organic molecules and ingested (food/fish) the biological half life can be closer to 40 days.

[–] [email protected] 2 points 1 year ago* (last edited 1 year ago)

Yeah, that's why I have concerns about constant tritated waste dumping from an active plant. Not so much in this case. It's a very small amount over a very long time.

Edit: and in regards to it using it as hydrogen, even in that case, the tritium will likely damage whatever it's made into and quickly turn back into water. That's why fully titrated water is so oxidizing. It knocks it's own hydrogen off.

[–] [email protected] 2 points 1 year ago

Yup. The other stuff has been removed. All that's left is the actual water, which is radioactive.

[–] [email protected] 2 points 1 year ago

Thank you! I took ONE 100 level science class on radiation and every one almost always seem to be wrong in their understanding. Enough that I doubted everything I learned (for a while)

[–] [email protected] 2 points 1 year ago

Thank you for this!

[–] [email protected] -2 points 1 year ago* (last edited 1 year ago) (2 children)

Ok but, people aren't talking about drinking the sea water, are they? It's about eating fish and sea vegetables that are living/growing in it. Do we know what the effect of eating these foods will be?

A fish will be consuming a lot more than a litre of water over its lifespan.

Edit: You could answer my question instead of downvoting me...

[–] [email protected] 1 points 1 year ago (1 children)

I'm sure they'd let you drink some of you want. Seems much less safe to me and I'm not sure you could drink enough to make a difference, at least as far as the fish are concerned.

[–] [email protected] 0 points 1 year ago

I'm not sure what you're saying, and if this is a joke, I don't get it 😆

[–] [email protected] -5 points 1 year ago (2 children)

Maybe this one act considered independently isn't that bad. What I don't like is the "dilution is the solution to pollution" attitude that comes from acceptance of this type of activity.

[–] [email protected] 8 points 1 year ago* (last edited 1 year ago) (2 children)

For tritiated water, it largely is. For other bioaccumulative radio-isotopes it's not. There's still potential for concerns. But I think this release is good.

[–] [email protected] 6 points 1 year ago

Agreed. Sometimes dilution is the solution.

But, I wouldn't say this is "good". I'd rather it not be necessary, but it is, and the relative amount of badness is basically nil.

[–] [email protected] 2 points 1 year ago (3 children)

If the water is fine, why does it have to be released?

Also, would the water from the plant be safe to swim in, or only once it's diluted with the sea?

[–] [email protected] 3 points 1 year ago

I believe it's because they don't have the capacity to store it properly anymore. So diluting it and releasing it little by little is what they came up with. It's not ideal but it's the least worse solution they have.

[–] [email protected] 3 points 1 year ago

Truthfully? I'd swim in the filtered water, but I'm not as concerned with radioactive exposure as others. It's only a few grams of tritium. Really to be safe you'd need to dilute it more. Tritium is a beta emitter that's blocked by the skin, so it's only a problem when it's absorbed. It's readily absorbed since it's water, but it's also readily released, since it's water.

[–] [email protected] 2 points 1 year ago

Because at the concentration it's being stored at, it will continue to be dangerous for a long time, and we can't count on it being contained indefinitely because shit happens, like earthquakes and tsunamis.

[–] [email protected] 7 points 1 year ago

All radioactive elements decay. Tritium has a half life of about 12½ years and it turns into ordinary hydrogen. If they keep releasing tritium at the same rate for a long time, it will reach a maximum concentration in about 25 years (or maybe less, depending on how accurate my fuzzy math is). Once it reaches that point, it will decay as fast as it's released.

It's also worth noting that if they want to release the tritium at a constant rate, they'll have to gradually increase the rate at which they release the contaminated water, because the tritium is already decaying in storage.

[–] [email protected] 6 points 1 year ago (1 children)

Few weeks ago... https://www.theguardian.com/environment/2023/jul/24/fukushima-fish-with-180-times-legal-limit-of-radioactive-cesium-fuels-water-release-fears

[–] [email protected] 3 points 1 year ago (3 children)

Rainwater from the areas around reactors one, two and three, which melted down during the March 2011 disaster, flows into the inner breakwater where the rockfish was caught in May.

The water being released now is diluted and much less contaminated.

[–] [email protected] 1 points 1 year ago

Less than 40% of the water is supposed to be treated. Apparently those fishes are supposed to come from the port a zone they can't even contain. Keep in mind how many times did TEPCO lie.

[–] [email protected] 3 points 1 year ago (1 children)

Good to see for the fish.

[–] [email protected] 8 points 1 year ago (1 children)

It's actually really good, since China blocked imports and fish population will be able to grow

[–] [email protected] 2 points 1 year ago

Touche!

[–] [email protected] 3 points 1 year ago

Sure, just keep distracting from the fact that you just created Godzilla.

[–] [email protected] 0 points 1 year ago (2 children)

This is just dumb. They just started releasing the contaminated water and they will keep doing so for a long time. This will lead to ever increasing concentrations of tritium which will then be further concentrated in living organisms. So it'll take quite a while for effects to be seen.

[–] [email protected] 7 points 1 year ago

isn't this supposed to be mitigated by the fact that the tritium eventually blends into the larger ocean such that the concentration remains in harmless levels at the end anyway?

[–] [email protected] 6 points 1 year ago (1 children)

The half-life of tritium is 12.33 years, so no, it won't be ever-increasing. In 12.33 years, there will be half as much.

[–] [email protected] 1 points 1 year ago

Date of meltdown: March 11, 2011.