I suspect that the nuclear waste at Fukushima that they intend to release into the ocean is of that category very-low-level nuclear waste. 2.1gram of tritium diluted in 860,000 tons of water. Not sure how many Becquerels/gram that is, but I would be interested to know if its actually higher than the 0.1 of the banana.

Is there a minimum level for what can be called very-low-level nuclear waste?

(As a minor side note, someone should update wikipedia since VLLW does not seem to exist there as a category and waste with less than 100 kBq/kg is explicitly defined as LLW).

Surprisingly, it's a lot more radioactive than the bananas.

Pure tritium is 3.57×10^14 Bq/g [0]

It's being diluted at a ratio of 4x10^11 : 1 so the diluted mixture still has 1000 Bq/g, or four orders of magnitude stronger than the equivalent mass in bananas.

Of course, it gets diluted more after you release it into the ocean, but it would take a lot of mixing to get the water down only to banana levels.

[0] https://en.wikipedia.org/wiki/Tritium

Very interesting. Looking at those numbers, potassium-40 has 32 bg/g. Does that mean that atoms of tritium gives out 10^13 more energy every second compared to potassium-40? It would be funny to see how long a city could survive on just then 1 gram of tritium, and it does give a bit more context to the idea of running a city on potassium-40.

Potassium atoms are bigger, so I think it's only 10^12 if you want to compare per-atom, but yes.