you are confusing radioactive contamination and irradiation.
It doesn’t matter at all for the human consuming the fish if the fish is irradiated or not. The fish might die early and get cancer, but that doesn’t affect the human eating it, does it?
The real problem is the fish being contaminated with radioactive substances. This is where the radioactive isotopes in the water are ingested by the fish, and therefore also the human that eats it. Now the human will have an increased risk of cancer, likelihood of radiation sickness, etc if consumed in large enough quantity.
The radiative material in the water is still diluted enough to not be an issue though
Also, water blocks radiation rather well, and heavy water sinks. It’s no problem there.
you are confusing radioactive contamination and irradiation.
It doesn’t matter at all for the human consuming the fish if the fish is irradiated or not. The fish might die early and get cancer, but that doesn’t affect the human eating it, does it?
The real problem is the fish being contaminated with radioactive substances. This is where the radioactive isotopes in the water are ingested by the fish, and therefore also the human that eats it. Now the human will have an increased risk of cancer, likelihood of radiation sickness, etc if consumed in large enough quantity.
The radiative material in the water is still diluted enough to not be an issue though