Superman and Kryptonite

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Superman has a major weakness. Kryptonite can kill Superman. Why doesn't Superman wear a utility belt with a Kryptonite detector built in? If someone has a lead box and plans to open it to expose Kryptonite inside, why doesn't Superman use his super speed and grab the box before it is opened. Also, Superman can fly away from any danger before it occurs. Now if he is under a Kryptonite dome, that is a different story. Superman can also blow away Kryptonite with his super breath. Come on Superman, you have super intelligence, figure this out.