“It’s called the seven-ten rule,” Dakota said. “For every seven-fold increase in time after the detonation, there’s a ten-fold decrease in the exposure rate. Or, when the amount of time is multiplied by seven, the exposure rate is divided by ten. “In a nutshell, in twenty-four hours, the radiation dose will be at ten percent of what it is now. In forty-eight hours, it will be at one percent.”
