Radioactive Kinetics

An alien visited our planet in year 5305 and found that humans have long gone. THE ALIEN FOUND THAT HUMANITY DESTROYED ITSELF IN A NUCLEAR WAR. HE ANALYSED A CERTAIN CHUNK OF CONCRETE AND FOUND 2.5g of radium and 6.8g of 206-lead(PB). what was the year of the nuclear war? Please someone help!
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