No radiation is really "safe" and and 1 to 3 stones are very unlikely, also stones will never show up there unless calcified. People that have stones have thousands of stones, reason you gotta keep flushing it till they stop appearing.
Surgery wlil not solve your problem because if you have them in your gallbladdder you have them in your liver for sure. And cutting the gallbladder is like leaving your water pipe open all the time in your house, you won't get enough bile when you need it leading to other problems.