Actually, you can find that during this chain where we are starting from Uranium 238 actually Uranium 234 comes back somewhere in between whereas, while you will be ending up with Lead 206, there were other elements like Lead 210, which is also Lead 214 which are radioactive in nature.
206 के साथ समाप्त हो जाएंगे, लीड 210 जैसे अन्य तत्व थे, जो लीड 214 भी है प्रकृति में रेडियोधर्मी हैं।