Radioactive

During the testing for finding a new source of energy, a uranium plant exploded leaving the city of Isotopia completely destroyed. Not many organisms survived and the ones that did were mutated.
Lumen's family didn't survive the blast. Quark is in a similar situation he is left with his three year old brother John Entropy. All the living organisms of Isotopia have only one half life left in the area. This half life is approximately 7 weeks and 4 days. If they don't leave the area within that time limit they too will die but if they do make it out they risk the government killing them.
The government is trying their best to keep this town a secret. They believe it will cause mass chaos around the world. They heavily guard the area and claim that it is still radioactive.
Will Lumen, Quark, and John Entropy make it out in time or will they meet the same fate as their families?