과학/건강

The Fukushima nuclear power plant contaminated water discharge issue is not just a local matter, but a critical scientific issue that can directly affect the global marine environment, ecosystem, and human health. The Japanese government and TEPCO claim that they have removed most radioactive nuclides with the Advanced Liquid Processing System (ALPS), but some nuclides such as tritium (³H) and carbon-14 (C-14) cannot be removed or are extremely difficult to remove. Diluting these substances in large amounts of seawater does not completely eliminate the harm, and may cause cumulative risks in the long term.

The problem of bioaccumulation of radioactive materials cannot be ignored. Radionuclides such as tritium, carbon-14, strontium-90, and cesium-137 released into the sea can be absorbed by marine microalgae and plankton, and are concentrated and transferred to fish, mammals, and ultimately humans along the food chain. This is a problem that cannot be explained by simple dilution logic, and can lead to fatal health damage such as increased cancer rates, decreased reproductive function, and genetic mutations, especially with long-term exposure.

In the case of tritium, as an isotope of hydrogen, it can directly bind to the DNA and protein structures of living organisms, and internal exposure due to this is known to be much more dangerous than external exposure. In particular, fetuses, infants, and pregnant women are more susceptible to radiation, so even the same concentration can have a more serious impact. In addition, radioactive carbon-14 has a half-life of 5,730 years, and has the characteristic of being able to accumulate in organisms while remaining in the environment for thousands of years.

There is a high possibility of disruption to the marine ecosystem. Radioactive materials can damage the DNA of organisms, leading to a decrease in biodiversity. In particular, if microalgae or plankton, which form the basis of the marine ecosystem, are affected, a chain effect may occur, causing the entire marine food web to collapse. This can affect not only the depletion of fishery resources in specific areas but also the balance of the global marine ecosystem.

The reproduction and development processes of marine organisms are particularly vulnerable to radiation. Exposure to radioactive materials during the spawning season of fish or the molting process of crustaceans such as shrimp and crabs can lead to deformities or decreased survival rates. In addition, if primary producers such as seaweed are exposed to radiation for a long period of time, their photosynthetic capacity may decrease, causing fundamental changes in the energy flow of the entire marine ecosystem.

Long-term and global spread is a concern. Seawater moves across borders through currents and circulation. Radioactive materials released from the waters near Fukushima could spread throughout the Pacific Ocean within a few years and potentially reach the Indian and Atlantic Oceans in the long term. This is not just a problem for a specific country, but a problem for all humanity. Due to the nature of ocean currents, materials released from Fukushima are expected to circulate in the North Pacific along the Kuroshio Current, reaching the west coast of the United States, Canada, and Alaska. It will then move to the South Pacific via the Equatorial Current and ultimately spread to oceans around the world. In particular, migratory marine organisms such as salmon, tuna, and whales have extensive migration routes and can serve as vectors for spreading radioactive contamination globally.

Scientific uncertainty remains high. The Japanese government emphasizes safety based on verification by the international organization (IAEA), but data on long-term cumulative effects are lacking. Considering that the discharge is expected to continue for decades, it is difficult to predict future environmental and biological outcomes based solely on current laboratory analysis. In particular, the long-term effects of low-dose radiation exposure have not yet been clearly identified, and this remains the greatest potential risk. Monitoring results to date indicate that tritium concentrations are being managed within the expected range in the initial stages of discharge. However, this is only short-term data, and the cumulative effect of continuous discharge over decades is still unknown. Furthermore, questions are being raised as to whether the current monitoring system can fully track all radioactive nuclides and their interactions and variations.

The Fukushima contaminated water discharge issue also raises important issues from an international legal perspective. According to the United Nations Convention on the Law of the Sea (UNCLOS), each country has an obligation to protect and preserve the marine environment and must ensure that activities carried out under its jurisdiction do not damage the environment of other countries. Japan's unilateral decision to discharge the water may conflict with these international legal obligations. Furthermore, the lack of sufficient consultation and agreement with neighboring countries in the decision-making process is also a problem. Countries bordering the Pacific Ocean, including South Korea and China, have consistently expressed concerns, but their opinions have not been adequately reflected. This can be seen as a violation of the principles of environmental justice and international cooperation.

The economic ripple effects of the discharge cannot be overlooked. The long-term impact on the fishing industry and related industries is expected to be very significant. Consumers' anxiety about radioactive contamination may lead to a general avoidance of consuming Pacific seafood, which will directly hit the livelihoods of fishermen in the region. In particular, as consumer confidence in seafood from Fukushima has not yet recovered in Japan itself, greater economic losses are feared once the discharge begins. Furthermore, there is a possibility that it will spread into trade disputes between countries with active seafood exports and imports. Some countries have already taken measures to ban or restrict imports of Japanese seafood, and there are concerns that these economic conflicts will intensify.

In addition to the marine discharge currently chosen by Japan, various alternative treatment methods exist. Technical alternatives such as evaporation, electrolysis, underground burial, and solidification have been proposed, but the Japanese government has ruled them out due to cost and technical limitations. However, there is a need to explore safer treatment methods through more in-depth research and international cooperation on these alternatives. In particular, high-temperature steam treatment and tritium separation technology have not yet reached the commercialization stage, but they are technologies with development potential from a long-term perspective. If the international community cooperates and invests in the development of these technologies, it will be possible to find a safer alternative than ocean discharge. In addition, a plan to secure sufficient storage capacity and store it until radioactivity decreases naturally can also be considered.

The transparency of the discharge process and the participation of civil society are also important tasks. Questions are being raised as to whether the current monitoring and information disclosure system is sufficiently transparent and reliable. It is necessary to establish an independent international monitoring system, disclose real-time data, and expand the participation of civil society and experts. In addition, safety devices and emergency response systems should be established to immediately stop the discharge process if unexpected situations occur. Securing this transparency and accountability is a prerequisite for gaining the trust of the international community.

The most important thing is responsibility for future generations. We must fully consider how current decisions will affect humanity in decades or hundreds of years. Considering the half-life of radioactive materials, the impact of currently discharged contaminated water can last for generations. In particular, if changes in the marine environment due to climate change are combined with radioactive contamination, unexpected complex effects may appear. It is difficult to predict how rising sea temperatures, ocean acidification, and changes in ocean currents will affect the spread and biological impact of radioactive materials.

The release of Fukushima contaminated water can be seen as an act of forcing a scientifically unverified experiment on a global scale, rather than a typical international environmental conflict. While it may show insignificant numerical changes in the short term, it can have a significant impact on human health, marine ecosystems, and global food security in the long term. This requires a cautious and conservative approach, as it could bring irreversible disaster to future generations. Alternative treatment technology development, long-term storage, and the establishment of an international cooperation system should be discussed in international consensus. In addition, a transparent monitoring system and the participation of civil society should ensure a democratic and responsible decision-making process. Above all, this issue cannot be resolved by the unilateral decision of one country. Bearing responsibility for the marine environment shared by all mankind, the international community must work together to find safe and sustainable solutions. We must not compromise the safety of future generations for the convenience of the current generation.