Discussion in 'Present & Current Events' started by michael59, Oct 20, 2020.
That can't be good.
The amount of water is a red herring. What matters is the amount and the type of radionuclides contained in the water.
These answer given below are what I found by googling the question, "What type of radionuclides would be in nuclear waste water from Japan?"
The primary releases of radioactive nuclides have been iodine and caesium; strontium and plutonium have also been found. These elements have been released into the air via steam; and into the water leaking into groundwater or the ocean.
Tepco has attempted to remove most radionuclides from the excess water, but the technology does not exist to rid the water of tritium, a radioactive isotope of hydrogen. Coastal nuclear plants commonly dump water that contains tritium into the ocean. It occurs in minute amounts in nature.
I have found more information on this issue since the last postings in this thread.
The water that Japan is to start dumping into the ocean is 860,000 cubic metres of partially tritiated water. Tritiated means that some of the hydrogen atoms making up the water molecules are tritium, an isotope of hydrogen with two neutrons. The most abundant form of hydrogen consists of a proton in its nucleus. A hydrogen atom with a neutron is called deuterium, because there are two nucleons, and with a second neutron is called tritium, because there are three nucleons in total. Deuterium is stable, but tritium is radioactive.
The amount of tritium in the water was 2.1 grammes in 2016, equivalent then to 14 millilitres of pure tritiated water, of which there should be about 1.6 g presently, given the decay rate of tritium, equal to about 11 mL of pure tritrated water. There was a measured specific radioactivity of 330 kilobecquerels per litre in 2016, meaning that there should be about 232 kBq /L presently. This means that there are 232,000 radioactive decay events every second in one litre of the water. This compares with around 20 kBq in the average human body.
The main contributors to human radioactivity are beta emitters (potassium 40, and carbon 14) like tritium. A beta emission is an electron emitted from the nucleus of the atom, which typically causes a neutron to change into a proton. The beta particles emitted by tritium are at a lower energy than those released in the body, however. There are about 8 giga-electron-volts of beta particles emitted in the body every second, compared to about 4.3 GeV/s in a litre of the titriated water in Fukushima.
The Japanese government wants to slowly release this water into the ocean over decades, the ecological and health effects of which will be nil. The psychological effects on people who lack an understanding are what must be managed.
Released over decades is preferrable over dumping all in one year or something similar...The effects should be minimal as you said, however there is always a chance for some illegal dumping to occur periodically so the site and waste water must be diligently monitored...
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