Well, radioactive rays have been used to inspect underground pipes and study coal-fields. Then there are isotope test devices which are applied to metallurgy, paper-making, textile industry, and some other light industries. What about its medical application? I mentioned isotope test devices just now. They're also for medical use. I've no idea what isotopes are or how the devices work. Well, that's a branch of nuclear technology, but I don't really know how it works. Anyway, isotopes are used to examine the liver, heart, kidney, thyroid, and some other organs of the body. For example, about two milliliters of blood samples are sufficient to find out if someone has liver cancer. You've painted a beautiful picture of nuclear technology for civil use. But won't it also bring about serious problems? Such as... Such as the potential for detrimental effects to soil, water, and plant genetics. Well, scientists are working on those problems, I believe they'll find solutions.